tag:blogger.com,1999:blog-452955626904524272024-03-13T19:34:41.033-07:00High Energy Physics - ExperimentSite for <a href="http://communitypeerreview.blogspot.com/">Community Peer Review</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.comBlogger4280125tag:blogger.com,1999:blog-45295562690452427.post-86368296800162207932013-08-06T00:05:00.031-07:002013-08-06T00:05:58.896-07:001011.3776 (Evgeny Akhmedov)<h2 class="title"><a href="http://arxiv.org/abs/1011.3776">Beta decay and other processes in strong electromagnetic fields</a> [<a href="http://arxiv.org/pdf/1011.3776">PDF</a>]</h2>Evgeny Akhmedov<a name='more'></a><blockquote class="abstract">We consider effects of the fields of strong electromagnetic waves on various characteristics of quantum processes. After a qualitative discussion of the effects of external fields on the energy spectra and angular distributions of the final-state particles as well as on the total probabilities of the processes (such as decay rates and total cross sections), we present a simple method of calculating the total probabilities of processes with production of non-relativistic charged particles. Using nuclear beta-decay as an example, we study the weak and strong field limits, as well as the field-induced beta-decay of nuclei stable in the absence of the external fields, both in the tunneling and multi-photon regimes. We also consider the possibility of accelerating forbidden nuclear beta-decays by lifting the forbiddeness due to the interaction of the parent or daughter nuclei with the field of a strong electromagnetic wave. It is shown that for currently attainable electromagnetic fields all effects on total beta-decay rates are unobservably small.</blockquote>View original: <a href="http://arxiv.org/abs/1011.3776">http://arxiv.org/abs/1011.3776</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-87415240207418902252013-08-06T00:05:00.029-07:002013-08-06T00:05:57.919-07:001305.2405 (R. Agnese et al.)<h2 class="title"><a href="http://arxiv.org/abs/1305.2405">Demonstration of Surface Electron Rejection with Interleaved Germanium<br /> Detectors for Dark Matter Search</a> [<a href="http://arxiv.org/pdf/1305.2405">PDF</a>]</h2>R. Agnese, A. J. Anderson, D. Balakishiyeva, R. Basu Thakur, D. A. Bauer, A. Borgland, D. Brandt, P. L. Brink, R. Bunker, B. Cabrera, D. O. Caldwell, D. G. Cerdeno, H. Chagani, M. Cherry, J. Cooley, B. Cornell, C. H. Crewdson, P. Cushman, M. Daal, P. C. F. Di Stefano, E. Do Couto E Silva, T. Doughty, L. Esteban, S. Fallows, E. Figueroa-Feliciano, J. Fox, M. Fritts, G. L. Godfrey, S. R. Golwala, J. Hall, H. R. Harris, J. Hasi, S. A. Hertel, B. A. Hines, T. Hofer, D. Holmgren, L. Hsu, M. E. Huber, A. Jastram, O. Kamaev, B. Kara, M. H. Kelsey, S. A. Kenany, A. Kennedy, C. J. Kenney, M. Kiveni, K. Koch, B. Loer, E. Lopez Asamar, R. Mahapatra, V. Mandic, C. Martinez, K. A. McCarthy, N. Mirabolfathi, R. A. Moffatt, D. C. Moore, P. Nadeau, R. H. Nelson, L. Novak, K. Page, R. Partridge, M. Pepin, A. Phipps, K. Prasad, M. Pyle, H. Qiu, R. Radpour, W. Rau, P. Redl, A. Reisetter, R. W. Resch, Y. Ricci, T. Saab, B. Sadoulet, J. Sander, R. Schmitt, K. Schneck, R. W. Schnee, S. Scorza, D. Seitz, B. Serfass, B. Shank, D. Speller, A. Tomada, A. N. Villano, B. Welliver, D. H. Wright, S. Yellin, J. J. Yen, B. A. Young, J. Zhang<a name='more'></a><blockquote class="abstract">SuperCDMS, a direct search for WIMPs, is currently operating a 9-kg array of cryogenic germanium (Ge) detectors in the Soudan Underground Laboratory. These detectors, known as iZIPs, use ionization and phonon sensors placed symmetrically on both sides of a Ge crystal to measure both charge and athermal phonons from each particle interaction. The information from each event provides excellent discrimination between electron recoils and nuclear recoils, as well as discrimination between events on the detector surface and those in the interior. To demonstrate the surface electron rejection capabilities, two $^{210}$Pb sources were installed facing detectors, producing $\sim$130 beta decays/hr. In $\sim$800 live hours, no events leaked into the WIMP signal region in the recoil energy range 8--115 keVr, providing an upper limit to the surface event leakage fraction of $1.7 \times 10^{-5}$ at 90% C.L. This rejection factor demonstrates that surface electrons would produce $< 0.6$ event background in the 0.3 ton-year exposure for the proposed 200-kg iZIP array in SuperCDMS SNOLAB.</blockquote>View original: <a href="http://arxiv.org/abs/1305.2405">http://arxiv.org/abs/1305.2405</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-50722988533517564152013-08-06T00:05:00.027-07:002013-08-06T00:05:57.043-07:001308.0295 (Arsham Farzinnia et al.)<h2 class="title"><a href="http://arxiv.org/abs/1308.0295">Natural Electroweak Symmetry Breaking from Scale Invariant Higgs<br /> Mechanism</a> [<a href="http://arxiv.org/pdf/1308.0295">PDF</a>]</h2>Arsham Farzinnia, Hong-Jian He, Jing Ren<a name='more'></a><blockquote class="abstract">We present a minimal viable extension of the standard model (SM) with classical scale symmetry. Its scalar sector contains a complex singlet in addition to the SM Higgs doublet. The scale-invariant and CP-symmetric Higgs potential generates radiative electroweak symmetry breaking a la Coleman-Weinberg, and gives a natural solution to the hierarchy problem, free from fine-tuning. Besides the 125GeV SM-like Higgs particle, it predicts a new CP-even Higgs (serving as the pseudo-Nambu-Goldstone boson of scale symmetry breaking) and a CP-odd scalar singlet (providing the dark matter candidate) at weak scale. We systematically analyze experimental constraints from direct LHC Higgs searches and electroweak precision tests, as well as theoretical bounds from unitarity, triviality and vacuum stability. We demonstrate the viable parameter space, and discuss implications for new Higgs searches at the upcoming LHC runs and the on-going direct detections of dark matter.</blockquote>View original: <a href="http://arxiv.org/abs/1308.0295">http://arxiv.org/abs/1308.0295</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-18929520457512407822013-08-06T00:05:00.025-07:002013-08-06T00:05:56.000-07:001308.0524 (Pavel Fileviez Perez et al.)<h2 class="title"><a href="http://arxiv.org/abs/1308.0524">Supersymmetry at the LHC and The Theory of R-parity</a> [<a href="http://arxiv.org/pdf/1308.0524">PDF</a>]</h2>Pavel Fileviez Perez, Sogee Spinner<a name='more'></a><blockquote class="abstract">We discuss the possible signatures at the Large Hadron Collider in models where R-parity is spontaneously broken. In the context of the minimal gauge theory for R-parity, we investigate signals with multileptons which can provide an unique test of this theory. The possible impact of these ideas for the search of supersymmetry at the Large Hadron Collider is discussed. We also discuss the constraints coming from cosmology due to the existence of two light sterile neutrinos in the theory.</blockquote>View original: <a href="http://arxiv.org/abs/1308.0524">http://arxiv.org/abs/1308.0524</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-67557985679820308812013-08-06T00:05:00.023-07:002013-08-06T00:05:55.201-07:001308.0612 (Yang Bai et al.)<h2 class="title"><a href="http://arxiv.org/abs/1308.0612">Fermion Portal Dark Matter</a> [<a href="http://arxiv.org/pdf/1308.0612">PDF</a>]</h2>Yang Bai, Joshua Berger<a name='more'></a><blockquote class="abstract">We study a class of simplified dark matter models in which one dark matter particle couples with a mediator and a Standard Model fermion. In such models, collider and direct detection searches probe complimentary regions of parameter space. For Majorana dark matter, direct detection covers the region near mediator-dark matter degeneracy, while colliders probe regions with a large dark matter and mediator mass splitting. For Dirac and complex dark matter, direct detection is effective for the entire region above the mass threshold, but colliders provide a strong bound for dark matter lighter than a few GeV. We also point out that dedicated searches for signatures with two jets or a mono-jet not coming from initial state radiation, along missing transverse energy can cover the remaining parameter space for thermal relic dark matter.</blockquote>View original: <a href="http://arxiv.org/abs/1308.0612">http://arxiv.org/abs/1308.0612</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-10843639591602821772013-08-06T00:05:00.021-07:002013-08-06T00:05:54.443-07:001308.0672 (David M. Asner et al.)<h2 class="title"><a href="http://arxiv.org/abs/1308.0672">Belle II Experiment Network and Computing</a> [<a href="http://arxiv.org/pdf/1308.0672">PDF</a>]</h2>David M. Asner, Eli Dart, Takanori Hara<a name='more'></a><blockquote class="abstract">The Belle experiment, part of a broad-based search for new physics, is a collaboration of approximately 400 physicists from 55 institutions across four continents. The Belle detector is located at the KEKB accelerator in Tsukuba, Japan. The Belle detector was operated at the asymmetric electron-positron collider KEKB from 1999-2010. The detector accumulated more than 1/ab of integrated luminosity corresponding to more than 2 PB of data near 10 GeV center-of-mass energy. Recently, KEK has initiated a $400 million accelerator upgrade to be called SuperKEKB, designed to produce instantaneous and integrated luminosity two orders of magnitude greater than KEKB. The new international collaboration at SuperKEKB is called Belle II. The first data from Belle II/SuperKEKB is expected in 2015. In October 2012, senior members of the Belle II collaboration gathered at PNNL to discuss the computing and networking requirements of the Belle II experiment with ESnet staff and other computing and networking experts. The day-and-a-half-long workshop characterized the instruments and facilities used in the experiment, the process of science for Belle II, and the computing and networking equipment and configuration requirements to realize the full scientific potential of the collaboration's work. The requirements identified at the Belle II Experiment Requirements workshop are summarized in this report.</blockquote>View original: <a href="http://arxiv.org/abs/1308.0672">http://arxiv.org/abs/1308.0672</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-71308333279605743422013-08-06T00:05:00.019-07:002013-08-06T00:05:53.391-07:001308.0736 (V. Uzhinsky)<h2 class="title"><a href="http://arxiv.org/abs/1308.0736">Toward UrQMD Model Description of pp and pC Interactions at High<br /> Energies</a> [<a href="http://arxiv.org/pdf/1308.0736">PDF</a>]</h2>V. Uzhinsky<a name='more'></a><blockquote class="abstract">It is found that UrQMD model version 3.3 does not describe NA61/SHINE Collaboration data on \pi-meson production in pp interactions at energies 20 - 80 GeV. At the same time, it describes quite well the NA49 Collaboration data on the meson production in pp and pC interactions at 158 GeV. The Collaborations do not consider feedback of \eta-meson decays. All versions of the UrQMD model assume that \eta-mesons are "stable". An inclusion of the decays into calculations leads to 2--3 % increase of the meson production which is not enough for description of the data. Possible ways of the model improvements are considered. Conclusions of the paper are: accounting of \eta-meson decays is not essential for a description of experimental data; a new tuning of the UrQMD model parameters is needed for a successful description of pp and pC interactions at high energies; inclusion of the low mass diffraction dissociation in the UrQMD model would be desirable.</blockquote>View original: <a href="http://arxiv.org/abs/1308.0736">http://arxiv.org/abs/1308.0736</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-17455383382951577922013-08-06T00:05:00.017-07:002013-08-06T00:05:51.204-07:001308.0740 (Irina Nasteva)<h2 class="title"><a href="http://arxiv.org/abs/1308.0740">Studies of charmless B decays including CP violation effects</a> [<a href="http://arxiv.org/pdf/1308.0740">PDF</a>]</h2>Irina Nasteva<a name='more'></a><blockquote class="abstract">The latest experimental results in charmless B decays are presented with a focus on CP violation measurements. These include the first observation of CP violation in B_s decays, evidence for CP violation in charmless three-body B+ decays, branching fraction measurements of B+ --> ppK+ decays and the first observation of the decay B_s --> phi K*0 from LHCb, a comparison of B+ --> K+K-K+ CP violation measurements between LHCb and BaBar, and the first evidence for the decay B0 --> K+K-pi0 obtained by Belle.</blockquote>View original: <a href="http://arxiv.org/abs/1308.0740">http://arxiv.org/abs/1308.0740</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-71516702741564592452013-08-06T00:05:00.015-07:002013-08-06T00:05:50.418-07:001308.0772 (Kai Yi)<h2 class="title"><a href="http://arxiv.org/abs/1308.0772">Experimental Review of Structures in the $J/ψφ$ Mass Spectrum</a> [<a href="http://arxiv.org/pdf/1308.0772">PDF</a>]</h2>Kai Yi<a name='more'></a><blockquote class="abstract">The discovery of numerous new charmonium-like structures since 2003 have revitalized interest in exotic meson spectroscopy. These structures do not fit easily into the conventional charmonium model, and proposals like four-quark states, hybrids, and re-scattering effects have been suggested as explanations. Since 2009, several new structures were reported in the $J/\psi\phi$ mass spectrum with the following characteristics: they are the first ones reported decaying into two heavy mesons which contain both a $c\bar{c}$ pair and a $s\bar{s}$ pair; and their masses are well beyond the open charm pair threshold. Conventional $c\bar{c}$ states with a mass beyond the $J/\psi\phi$ threshold are not expected to decay into this channel and the width is expected to be large, thus they are good candidates for exotic mesons. My focus in this article is to review the recent developments on the structures in the $J/\psi\phi$ mass spectrum from CDF, Belle and LHCb.</blockquote>View original: <a href="http://arxiv.org/abs/1308.0772">http://arxiv.org/abs/1308.0772</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-23236058134708556042013-08-06T00:05:00.013-07:002013-08-06T00:05:49.665-07:001308.0792 (Xiaochuan Lu et al.)<h2 class="title"><a href="http://arxiv.org/abs/1308.0792">A Natural Higgs Mass in Supersymmetry from Non-Decoupling Effects</a> [<a href="http://arxiv.org/pdf/1308.0792">PDF</a>]</h2>Xiaochuan Lu, Hitoshi Murayama, Joshua T. Ruderman, Kohsaku Tobioka<a name='more'></a><blockquote class="abstract">The Higgs mass implies fine-tuning for minimal theories of weak scale supersymmetry (SUSY). Non-decoupling effects can boost the Higgs mass when new states interact with the Higgs, but new sources of SUSY breaking that accompany such extensions threaten naturalness. We show that a singlet with a Dirac mass can increase the Higgs mass while maintaining naturalness in the presence of large SUSY breaking in the singlet sector. We explore the modified Higgs phenomenology of this scenario, which we call the "Dirac NMSSM."</blockquote>View original: <a href="http://arxiv.org/abs/1308.0792">http://arxiv.org/abs/1308.0792</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-25971460741475365562013-08-06T00:05:00.011-07:002013-08-06T00:05:48.918-07:001308.0843 (A. Avetisyan et al.)<h2 class="title"><a href="http://arxiv.org/abs/1308.0843">Snowmass Energy Frontier Simulations using the Open Science Grid (A<br /> Snowmass 2013 whitepaper)</a> [<a href="http://arxiv.org/pdf/1308.0843">PDF</a>]</h2>A. Avetisyan, S. Bhattacharya, M. Narain, S. Padhi, J. Hirschauer, T. Levshina, P. McBride, C. Sehgal, M. Slyz, M. Rynge, S. Malik, J. Stupak III<a name='more'></a><blockquote class="abstract">Snowmass is a US long-term planning study for the high-energy community by the American Physical Society's Division of Particles and Fields. For its simulation studies, opportunistic resources are harnessed using the Open Science Grid infrastructure. Late binding grid technology, GlideinWMS, was used for distributed scheduling of the simulation jobs across many sites mainly in the US. The pilot infrastructure also uses the Parrot mechanism to dynamically access CvmFS in order to ascertain a homogeneous environment across the nodes. This report presents the resource usage and the storage model used for simulating large statistics Standard Model backgrounds needed for Snowmass Energy Frontier studies.</blockquote>View original: <a href="http://arxiv.org/abs/1308.0843">http://arxiv.org/abs/1308.0843</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-58208176413081720662013-08-06T00:05:00.009-07:002013-08-06T00:05:48.254-07:001308.0845 (Nathaniel Craig et al.)<h2 class="title"><a href="http://arxiv.org/abs/1308.0845">Multi-Lepton Signals of Top-Higgs Associated Production</a> [<a href="http://arxiv.org/pdf/1308.0845">PDF</a>]</h2>Nathaniel Craig, Michael Park, Jessie Shelton<a name='more'></a><blockquote class="abstract">We evaluate the potential to measure ttbar H associated production at the LHC using non-resonant multi-lepton final states in conjunction with two or more b-tags. The multi-lepton ttbar H signal arises predominantly from H to tau tau and H to WW^* alongside the semi-leptonic or fully leptonic decay of the ttbar pair. We demonstrate the power of a multi-lepton search for ttbar H associated production by recasting the CMS b-tagged multi-lepton search with 19.5 fb^-1 of 8 TeV data to obtain an observed (expected) limit of 4.7 (6.6) times the Standard Model rate, comparable to ongoing searches in 4b and bb gamma gamma final states. Sensitivity can be further improved by the addition of exclusive channels involving same-sign dileptons. We recast the CMS b-tagged same-sign dilepton search with 10.5 fb^-1 of 8 TeV data to set limits on ttbar H associated production, and approximately combine the two searches by calculating the fraction of same-sign dilepton signal events which do not satisfy multi-lepton selection criteria. We estimate an expected total non-resonant leptonic reach of mu < 5.0 times the Standard Model rate in 20 fb^-1 of 8 TeV data, with improvements possible.</blockquote>View original: <a href="http://arxiv.org/abs/1308.0845">http://arxiv.org/abs/1308.0845</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-15366076372603810252013-08-06T00:05:00.007-07:002013-08-06T00:05:47.240-07:001308.0878 (Daniel M. Kaplan et al.)<h2 class="title"><a href="http://arxiv.org/abs/1308.0878">Measuring Antimatter Gravity with Muonium</a> [<a href="http://arxiv.org/pdf/1308.0878">PDF</a>]</h2>Daniel M. Kaplan, Derrick Mancini, Thomas J. Phillips, Thomas J. Roberts, Richard Gustafson<a name='more'></a><blockquote class="abstract">We consider a measurement of the gravitational acceleration of antimatter, gbar, using muonium. A monoenergetic, low-velocity, horizontal muonium beam will be formed from a surface-muon beam using a novel technique and directed at an atom interferometer. The measurement requires a precision three-grating interferometer: the first grating pair creates an interference pattern which is analyzed by scanning the third grating vertically using piezo actuators. State-of-the-art nanofabrication can produce the needed membrane grating structure in silicon nitride or ultrananoscrystalline diamond. With 100 nm grating pitch, a 10% measurement of gbar can be made using some months of surface-muon beam time. This will be the first gravitational measurement of leptonic matter, of 2nd-generation matter and, possibly, the first measurement of the gravitational acceleration of antimatter.</blockquote>View original: <a href="http://arxiv.org/abs/1308.0878">http://arxiv.org/abs/1308.0878</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-39266145574944621962013-08-06T00:05:00.005-07:002013-08-06T00:05:46.081-07:001308.0961 (LHCb collaboration et al.)<h2 class="title"><a href="http://arxiv.org/abs/1308.0961">First evidence for the two-body charmless baryonic decay $B^0 \to p<br /> \bar{p}$</a> [<a href="http://arxiv.org/pdf/1308.0961">PDF</a>]</h2>LHCb collaboration, R. Aaij, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves Jr, S. Amato, S. Amerio, Y. Amhis, L. Anderlini, J. Anderson, R. Andreassen, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, C. Baesso, V. Balagura, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, Th. Bauer, A. Bay, J. Beddow, F. Bedeschi, I. Bediaga, S. Belogurov, K. Belous, I. Belyaev, E. Ben-Haim, G. Bencivenni, S. Benson, J. Benton, A. Berezhnoy, R. Bernet, M. -O. Bettler, M. van Beuzekom, A. Bien, S. Bifani, T. Bird, A. Bizzeti, P. M. Bjø rnstad, T. Blake, F. Blanc, J. Blouw, S. Blusk, V. Bocci, A. Bondar, N. Bondar, W. Bonivento, S. Borghi, A. Borgia, T. J. V. Bowcock, E. Bowen, C. Bozzi, T. Brambach, J. van den Brand, J. Bressieux, D. Brett, M. Britsch, T. Britton, N. H. Brook, H. Brown, I. Burducea, A. Bursche, G. Busetto, J. Buytaert, S. Cadeddu, O. Callot, M. Calvi, M. Calvo Gomez, A. Camboni, P. Campana, D. Campora Perez, A. Carbone, G. Carboni, R. Cardinale, A. Cardini, H. Carranza-Mejia, L. Carson, K. Carvalho Akiba, G. Casse, L. Castillo Garcia, M. Cattaneo, Ch. Cauet, R. Cenci, M. Charles, Ph. Charpentier, P. Chen, N. Chiapolini, M. Chrzaszcz, K. Ciba, X. Cid Vidal, G. Ciezarek, P. E. L. Clarke, M. Clemencic, H. V. Cliff, J. Closier, C. Coca, V. Coco, J. Cogan, E. Cogneras, P. Collins, A. Comerma-Montells, A. Contu, A. Cook, M. Coombes, S. Coquereau, G. Corti, B. Couturier, G. A. Cowan, E. Cowie, D. C. Craik, S. Cunliffe, R. Currie, C. D'Ambrosio, P. David, P. N. Y. David, A. Davis, I. De Bonis, K. De Bruyn, S. De Capua, M. De Cian, J. M. De Miranda, L. De Paula, W. De Silva, P. De Simone, D. Decamp, M. Deckenhoff, L. Del Buono, N. Déléage, D. Derkach, O. Deschamps, F. Dettori, A. Di Canto, H. Dijkstra, M. Dogaru, S. Donleavy, F. Dordei, A. Dosil Suárez, D. Dossett, A. Dovbnya, F. Dupertuis, P. Durante, R. Dzhelyadin, A. Dziurda, A. Dzyuba, S. Easo, U. Egede, V. Egorychev, S. Eidelman, D. van Eijk, S. Eisenhardt, U. Eitschberger, R. Ekelhof, L. Eklund, I. El Rifai, Ch. Elsasser, A. Falabella, C. Färber, G. Fardell, C. Farinelli, S. Farry, D. Ferguson, V. Fernandez Albor, F. Ferreira Rodrigues, M. Ferro-Luzzi, S. Filippov, M. Fiore, C. Fitzpatrick, M. Fontana, F. Fontanelli, R. Forty, O. Francisco, M. Frank, C. Frei, M. Frosini, S. Furcas, E. Furfaro, A. Gallas Torreira, D. Galli, M. Gandelman, P. Gandini, Y. Gao, J. Garofoli, P. Garosi, J. Garra Tico, L. Garrido, C. Gaspar, R. Gauld, E. Gersabeck, M. Gersabeck, T. Gershon, Ph. Ghez, V. Gibson, L. Giubega, V. V. Gligorov, C. Göbel, D. Golubkov, A. Golutvin, A. Gomes, P. Gorbounov, H. Gordon, C. Gotti, M. Grabalosa Gándara, R. Graciani Diaz, L. A. Granado Cardoso, E. Graugés, G. Graziani, A. Grecu, E. Greening, S. Gregson, P. Griffith, O. Grünberg, B. Gui, E. Gushchin, Yu. Guz, T. Gys, C. Hadjivasiliou, G. Haefeli, C. Haen, S. C. Haines, S. Hall, B. Hamilton, T. Hampson, S. Hansmann-Menzemer, N. Harnew, S. T. Harnew, J. Harrison, T. Hartmann, J. He, T. Head, V. Heijne, K. Hennessy, P. Henrard, J. A. Hernando Morata, E. van Herwijnen, M. 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Straumann, V. K. Subbiah, L. Sun, S. Swientek, V. Syropoulos, M. Szczekowski, P. Szczypka, T. Szumlak, S. T'Jampens, M. Teklishyn, E. Teodorescu, F. Teubert, C. Thomas, E. Thomas, J. van Tilburg, V. Tisserand, M. Tobin, S. Tolk, D. Tonelli, S. Topp-Joergensen, N. Torr, E. Tournefier, S. Tourneur, M. T. Tran, M. Tresch, A. Tsaregorodtsev, P. Tsopelas, N. Tuning, M. Ubeda Garcia, A. Ukleja, D. Urner, A. Ustyuzhanin, U. Uwer, V. Vagnoni, G. Valenti, A. Vallier, M. Van Dijk, R. Vazquez Gomez, P. Vazquez Regueiro, C. Vázquez Sierra, S. Vecchi, J. J. Velthuis, M. Veltri, G. Veneziano, M. Vesterinen, B. Viaud, D. Vieira, X. Vilasis-Cardona, A. Vollhardt, D. Volyanskyy, D. Voong, A. Vorobyev, V. Vorobyev, C. Voß, H. Voss, R. Waldi, C. Wallace, R. Wallace, S. Wandernoth, J. Wang, D. R. Ward, N. K. Watson, A. D. Webber, D. Websdale, M. Whitehead, J. Wicht, J. Wiechczynski, D. Wiedner, L. Wiggers, G. Wilkinson, M. P. Williams, M. Williams, F. F. Wilson, J. Wimberley, J. Wishahi, W. Wislicki, M. Witek, S. A. Wotton, S. Wright, S. Wu, K. Wyllie, Y. Xie, Z. Xing, Z. Yang, R. Young, X. Yuan, O. Yushchenko, M. Zangoli, M. Zavertyaev, F. Zhang, L. Zhang, W. C. Zhang, Y. Zhang, A. Zhelezov, A. Zhokhov, L. Zhong, A. Zvyagin<a name='more'></a><blockquote class="abstract">The results of a search for the rare two-body charmless baryonic decays $B^0 \to p \bar{p}$ and $B_s^0 \to p \bar{p}$ are reported. The analysis uses a data sample, corresponding to an integrated luminosity of 0.9 fb$^{-1}$, of $pp$ collision data collected by the LHCb experiment at a centre-of-mass energy of 7 TeV. An excess of $B^0 \to p \bar{p}$ candidates with respect to background expectations is seen with a statistical significance of 3.3 standard deviations. This is the first evidence for a two-body charmless baryonic $B^0$ decay. No significant $B_s^0 \to p \bar{p}$ signal is observed, leading to an improvement of three orders of magnitude over previous bounds. If the excess events are interpreted as signal, the 68.3% confidence level intervals on the branching fractions are {eqnarray} \cal{B}(B^0 \to p \bar{p}) & = & (1.47 \,^{+0.62}_{-0.51} \,^{+0.35}_{-0.14}) \times 10^{-8} \,, *{0.3cm} \cal{B}(B_s^0 \to p \bar{p}) & = & (2.84 \,^{+2.03}_{-1.68} \,^{+0.85}_{-0.18}) \times 10^{-8} \,, {eqnarray} where the first uncertainty is statistical and the second is systematic.</blockquote>View original: <a href="http://arxiv.org/abs/1308.0961">http://arxiv.org/abs/1308.0961</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-28615839784858169242013-08-06T00:05:00.003-07:002013-08-06T00:05:45.157-07:001308.1029 (Renata Zukanovich Funchal et al.)<h2 class="title"><a href="http://arxiv.org/abs/1308.1029">The Physics of Neutrinos</a> [<a href="http://arxiv.org/pdf/1308.1029">PDF</a>]</h2>Renata Zukanovich Funchal, Benoit Schmauch, Gaëlle Giesen<a name='more'></a><blockquote class="abstract">These lecture notes are based on a course given at Institut de Physique Th\'eorique of CEA/Saclay in January/February 2013.</blockquote>View original: <a href="http://arxiv.org/abs/1308.1029">http://arxiv.org/abs/1308.1029</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-47107648235721912172013-08-06T00:05:00.001-07:002013-08-06T00:05:44.007-07:001308.1048 (LHCb collaboration et al.)<h2 class="title"><a href="http://arxiv.org/abs/1308.1048">Measurement of the flavour-specific CP-violating asymmetry $a_{\rm<br /> sl}^s$ in $B_s^0$ decays</a> [<a href="http://arxiv.org/pdf/1308.1048">PDF</a>]</h2>LHCb collaboration, R. 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S. Rangel, I. Raniuk, N. Rauschmayr, G. Raven, S. Redford, M. M. Reid, A. C. dos Reis, S. Ricciardi, A. Richards, K. Rinnert, V. Rives Molina, D. A. Roa Romero, P. Robbe, D. A. Roberts, E. Rodrigues, P. Rodriguez Perez, S. Roiser, V. Romanovsky, A. Romero Vidal, J. Rouvinet, T. Ruf, F. Ruffini, H. Ruiz, P. Ruiz Valls, G. Sabatino, J. J. Saborido Silva, N. Sagidova, P. Sail, B. Saitta, V. Salustino Guimaraes, B. Sanmartin Sedes, M. Sannino, R. Santacesaria, C. Santamarina Rios, E. Santovetti, M. Sapunov, A. Sarti, C. Satriano, A. Satta, M. Savrie, D. Savrina, P. Schaack, M. Schiller, H. Schindler, M. Schlupp, M. Schmelling, B. Schmidt, O. Schneider, A. Schopper, M. -H. Schune, R. Schwemmer, B. Sciascia, A. Sciubba, M. Seco, A. Semennikov, K. Senderowska, I. Sepp, N. Serra, J. Serrano, P. Seyfert, M. Shapkin, I. Shapoval, P. Shatalov, Y. Shcheglov, T. Shears, L. Shekhtman, O. Shevchenko, V. Shevchenko, A. Shires, R. Silva Coutinho, M. Sirendi, N. Skidmore, T. Skwarnicki, N. A. Smith, E. Smith, J. Smith, M. Smith, M. D. Sokoloff, F. J. P. Soler, F. Soomro, D. Souza, B. Souza De Paula, B. Spaan, A. Sparkes, P. Spradlin, F. Stagni, S. Stahl, O. Steinkamp, S. Stevenson, S. Stoica, S. Stone, B. Storaci, M. Straticiuc, U. Straumann, V. K. Subbiah, L. Sun, S. Swientek, V. Syropoulos, M. Szczekowski, P. Szczypka, T. Szumlak, S. T'Jampens, M. Teklishyn, E. Teodorescu, F. Teubert, C. Thomas, E. Thomas, J. van Tilburg, V. Tisserand, M. Tobin, S. Tolk, D. Tonelli, S. Topp-Joergensen, N. Torr, E. Tournefier, S. Tourneur, M. T. Tran, M. Tresch, A. Tsaregorodtsev, P. Tsopelas, N. Tuning, M. Ubeda Garcia, A. Ukleja, D. Urner, A. Ustyuzhanin, U. Uwer, V. Vagnoni, G. Valenti, A. Vallier, M. Van Dijk, R. Vazquez Gomez, P. Vazquez Regueiro, C. Vázquez Sierra, S. Vecchi, J. J. Velthuis, M. Veltri, G. Veneziano, M. Vesterinen, B. Viaud, D. Vieira, X. Vilasis-Cardona, A. Vollhardt, D. Volyanskyy, D. Voong, A. Vorobyev, V. Vorobyev, C. Voß, H. Voss, R. Waldi, C. Wallace, R. Wallace, S. Wandernoth, J. Wang, D. R. Ward, N. K. Watson, A. D. Webber, D. Websdale, M. Whitehead, J. Wicht, J. Wiechczynski, D. Wiedner, L. Wiggers, G. Wilkinson, M. P. Williams, M. Williams, F. F. Wilson, J. Wimberley, J. Wishahi, W. Wislicki, M. Witek, S. A. Wotton, S. Wright, S. Wu, K. Wyllie, Y. Xie, Z. Xing, Z. Yang, R. Young, X. Yuan, O. Yushchenko, M. Zangoli, M. Zavertyaev, F. Zhang, L. Zhang, W. C. Zhang, Y. Zhang, A. Zhelezov, A. Zhokhov, L. Zhong, A. Zvyagin<a name='more'></a><blockquote class="abstract">The CP-violating asymmetry a_{sl}^s is studied using semileptonic decays of Bs and anti-Bs mesons produced in pp collisions at a centre-of-mass energy of 7 TeV at the LHC, exploiting a data sample corresponding to an integrated luminosity of 1.0/fb. The reconstructed final states are Ds^(+/-)\mu ^(-/+), with the Ds^(+/-) particle decaying in the \phi\pi^(+/-) mode. The Ds^(+/-)\mu ^{-/+) yields are summed over Bs and anti-Bs initial states, and integrated with respect to decay time. Data-driven methods are used to measure efficiency ratios. We obtain $a_{sl}^s$ = (-0.06 +/- 0.50 +/- 0.36)%, where the first uncertainty is statistical and the second systematic.</blockquote>View original: <a href="http://arxiv.org/abs/1308.1048">http://arxiv.org/abs/1308.1048</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-91771852789710579832013-08-05T00:04:00.023-07:002013-08-05T00:04:36.768-07:001308.0374 (Voica Radescu et al.)<h2 class="title"><a href="http://arxiv.org/abs/1308.0374">Combination and QCD Analysis of the HERA Inclusive Cross Sections</a> [<a href="http://arxiv.org/pdf/1308.0374">PDF</a>]</h2>Voica Radescu, H1, ZEUS collaborations<a name='more'></a><blockquote class="abstract">A QCD fit analysis to the combined HERA-I inclusive deep inelastic cross sections measured by the H1 and ZEUS collaborations for $e^\pm p$ scattering resulting into a competitive NLO PDF set, HERAPDF1.0 is presented. HERAPDF at NNLO fits are presented as well, resulting, however, in a worse description of the combined HERA data. In addition, a preliminary analysis including the HERA II measurements of lower proton-beam energies is performed. The effect of including the new data on the determination of HERA parton distribution functions is analysed, using fits similar to those performed for HERAPDF1.0. Some tension of the QCD fit with respect to the data is identified in the kinematic region of low $Q^2$ and low x. Finally, the QCD fit analysis of the combined HERA-I inclusive deep inelastic cross sections has been extended to include combined HERA II measurements at high $Q^2$. The effect of including these data on the determination of parton distribution functions is analysed, resulting into HERAPDF1.5. The precision of the new PDFs at high-x is considerably improved, particularly in the valence sector.</blockquote>View original: <a href="http://arxiv.org/abs/1308.0374">http://arxiv.org/abs/1308.0374</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-28667556489904758612013-08-05T00:04:00.021-07:002013-08-05T00:04:36.048-07:001308.0422 (Giampiero Passarino)<h2 class="title"><a href="http://arxiv.org/abs/1308.0422">Higgs Boson Production and Decay: Dalitz Sector</a> [<a href="http://arxiv.org/pdf/1308.0422">PDF</a>]</h2>Giampiero Passarino<a name='more'></a><blockquote class="abstract">The processes involving a Higgs boson, a photon(gluon) and a fermion pair pose severe challenges to the experimental analysis. They represent rare decays and production mechanisms of the Higgs boson at LHC. However, they are not Yukawa suppressed at next-to-leading order opening a window for the correct definition of pseudo-observables, e.g. a definition of the Higgs decay width into Z + photon with universal inherent meaning, that are currently used in extracting information for the couplings of the newly discovered resonance at LHC. The impact of genuinely electroweak NLO corrections is discussed, as well as the comparison of the full-fledged cross-sections to their zero-width approximation.</blockquote>View original: <a href="http://arxiv.org/abs/1308.0422">http://arxiv.org/abs/1308.0422</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-26567406547052307762013-08-05T00:04:00.019-07:002013-08-05T00:04:35.315-07:001308.0443 (Borexino Collaboration et al.)<h2 class="title"><a href="http://arxiv.org/abs/1308.0443">Final results of Borexino Phase-I on low energy solar neutrino<br /> spectroscopy</a> [<a href="http://arxiv.org/pdf/1308.0443">PDF</a>]</h2>Borexino Collaboration, G. Bellini, J. Benziger, D. Bick, G. Bonfini, D. Bravo, M. B. Avanzini, B. Caccianiga, L. Cadonati, F. Calaprice, P. Cavalcante, A. Chavarria, A. Chepurnov, D. D'Angelo, S. Davini, A. Derbin, A. Empl, A. Etenko, K. Fomenko, D. Franco, C. Galbiati, S. Gazzana, C. Ghiano, M. Giammarchi, M. Goeger-Neff, A. Goretti, L. Grandi, C. Hagner, E. Hungerford, Aldo Ianni, Andrea Ianni, V. Kobychev, D. Korablev, G. Korga, D. Kryn, M. Laubenstein, T. Lewke, E. Litvinovich, B. Loer, F. Lombardi, P. Lombardi, L. Ludhova, G. Lukyanchenko, I. Machulin, S. Manecki, W. Maneschg, G. Manuzio, Q. Meindl, E. Meroni, L. Miramonti, M. Misiaszek, P. Mosteiro, V. Muratova, L. Oberauer, M. Obolensky, F. Ortica, K. Otis, M. Pallavicini, L. Papp, C. Pena-Garay, L. Perasso, S. Perasso, A. Pocar, G. Ranucci, A. Razeto, A. Re, A. Romani, N. Rossi, R. Saldanha, C. Salvo, S. Schoenert, H. Simgen, M. Skorokhvatov, O. Smirnov, A. Sotnikov, S. Sukhotin, Y. Suvorov, R. Tartaglia, G. Testera, D. Vignaud, R. B. Vogelaar, F. von Feilitzsch, J. Winter, M. Wojcik, A. Wright, M. Wurm, J. Xu, O. Zaimidoroga, S. Zavatarelli, G. Zuzel<a name='more'></a><blockquote class="abstract">Borexino has been running since May 2007 at the LNGS with the primary goal of detecting solar neutrinos. The detector, a large, unsegmented liquid scintillator calorimeter characterized by unprecedented low levels of intrinsic radioactivity, is optimized for the study of the lower energy part of the spectrum. During the Phase-I (2007-2010) Borexino first detected and then precisely measured the flux of the 7Be solar neutrinos, ruled out any significant day-night asymmetry of their interaction rate, made the first direct observation of the pep neutrinos, and set the tightest upper limit on the flux of CNO neutrinos. In this paper we discuss the signal signature and provide a comprehensive description of the backgrounds, quantify their event rates, describe the methods for their identification, selection or subtraction, and describe data analysis. Key features are an extensive in situ calibration program using radioactive sources, the detailed modeling of the detector response, the ability to define an innermost fiducial volume with extremely low background via software cuts, and the excellent pulse-shape discrimination capability of the scintillator that allows particle identification. We report a measurement of the annual modulation of the 7 Be neutrino interaction rate. The period, the amplitude, and the phase of the observed modulation are consistent with the solar origin of these events, and the absence of their annual modulation is rejected with higher than 99% C.L. The physics implications of phase-I results in the context of the neutrino oscillation physics and solar models are presented.</blockquote>View original: <a href="http://arxiv.org/abs/1308.0443">http://arxiv.org/abs/1308.0443</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-91612098689177708792013-08-05T00:04:00.017-07:002013-08-05T00:04:34.608-07:001308.0465 (T2K collaboration et al.)<h2 class="title"><a href="http://arxiv.org/abs/1308.0465">Measurement of Neutrino Oscillation Parameters from Muon Neutrino<br /> Disappearance with an Off-axis Beam</a> [<a href="http://arxiv.org/pdf/1308.0465">PDF</a>]</h2>T2K collaboration, K. Abe, N. Abgrall, H. Aihara, T. Akiri, C. Andreopoulos, S. Aoki, A. Ariga, T. Ariga, S. Assylbekov, D. Autiero, M. Barbi, G. J. Barker, G. Barr, M. Bass, M. Batkiewicz, F. Bay, S. W. Bentham, V. Berardi, B. E. Berger, S. Berkman, I. Bertram, S. Bhadra, F. d. M. Blaszczyk, A. Blondel, C. Bojechko, S. B. Boyd, D. Brailsford, A. Bravar, C. Bronner, N. Buchanan, R. G. Calland, J. Caravaca Rodriguez, S. L. Cartwright, R. Castillo, M. G. Catanesi, A. Cervera, D. Cherdack, G. Christodoulou, A. Clifton, J. Coleman, S. J. Coleman, G. Collazuol, K. Connolly, L. Cremonesi, A. Curioni, A. Dabrowska, I. Danko, R. Das, S. Davis, P. de Perio, G. De Rosa, T. Dealtry, S. R. Dennis, C. Densham, F. Di Lodovico, S. Di Luise, O. Drapier, T. Duboyski, F. Dufour, J. Dumarchez, S. Dytman, M. Dziewiecki, S. Emery, A. Ereditato, L. Escudero, A. J. Finch, E. Frank, M. Friend, Y. Fujii, Y. Fukuda, A. P. Furmanski, V. Galymov, A. Gaudin, S. Giffin, C. Giganti, K. Gilje, T. Golan, J. J. Gomez-Cadenas, M. Gonin, N. Grant, D. Gudin, D. R. Hadley, A. Haesler, M. D. Haigh, P. Hamilton, D. Hansen, T. Hara, M. Hartz, T. Hasegawa, N. C. Hastings, Y. Hayato, C. Hearty, R. L. Helmer, M. Hierholzer, J. Hignight, A. Hillairet, A. Himmel, T. Hiraki, S. Hirota, J. Holeczek, S. Horikawa, K. Huang, A. K. Ichikawa, K. Ieki, M. Ieva, M. Ikeda, J. Imber, J. Insler, T. J. Irvine, T. Ishida, T. Ishii, S. J. Ives, K. Iyogi, A. Izmaylov, A. Jacob, B. Jamieson, R. A. Johnson, J. H. Jo, P. Jonsson, K. K. Joo, C. K. Jung, A. C. Kaboth, T. Kajita, H. Kakuno, J. Kameda, Y. Kanazawa, D. Karlen, I. Karpikov, E. Kearns, M. Khabibullin, A. Khotjantsev, D. Kielczewska, T. Kikawa, A. Kilinski, J. Kim, S. B. Kim, J. Kisiel, P. Kitching, T. Kobayashi, G. Kogan, A. Kolaceke, A. Konaka, L. L. Kormos, A. Korzenev, K. Koseki, Y. Koshio, I. Kreslo, W. Kropp, H. Kubo, Y. Kudenko, S. Kumaratunga, R. Kurjata, T. Kutter, J. Lagoda, K. Laihem, M. Laveder, M. Lawe, M. Lazos, K. P. Lee, C. Licciardi, I. T. Lim, T. Lindner, C. Lister, R. P. Litchfield, A. Longhin, G. D. Lopez, L. Ludovici, M. Macaire, L. Magaletti, K. Mahn, M. Malek, S. Manly, A. D. Marino, J. Marteau, J. F. Martin, T. Maruyama, J. Marzec, P. Masliah, E. L. Mathie, V. Matveev, K. Mavrokoridis, E. Mazzucato, N. McCauley, K. S. McFarland, C. McGrew, C. Metelko, P. Mijakowski, C. A. Miller, A. Minamino, O. Mineev, S. Mine, A. Missert, M. Miura, L. Monfregola, S. Moriyama, Th. A. Mueller, A. Murakami, M. Murdoch, S. Murphy, J. Myslik, T. Nagasaki, T. Nakadaira, M. Nakahata, T. Nakai, K. Nakamura, S. Nakayama, T. Nakaya, K. Nakayoshi, C. Nielsen, M. Nirkko, K. Nishikawa, Y. Nishimura, H. M. O'Keeffe, R. Ohta, K. Okumura, T. Okusawa, W. Oryszczak, S. M. Oser, M. Otani, R. A. Owen, Y. Oyama, M. Y. Pac, V. Palladino, V. Paolone, D. Payne, G. F. Pearce, O. Perevozchikov, J. D. Perkin, Y. Petrov, E. S. Pinzon Guerra, C. Pistillo, P. Plonski, E. Poplawska, B. Popov, M. Posiadala, J. -M. Poutissou, R. Poutissou, P. Przewlocki, B. Quilain, E. Radicioni, P. N. Ratoff, M. Ravonel, M. A. M. Rayner, A. Redij, M. Reeves, E. Reinherz-Aronis, F. Retiere, A. Robert, P. A. Rodrigues, E. Rondio, S. Roth, A. Rubbia, D. Ruterbories, R. Sacco, K. Sakashita, F. Sanchez, E. Scantamburlo, K. Scholberg, J. Schwehr, M. Scott, Y. Seiya, T. Sekiguchi, H. Sekiya, D. Sgalaberna, M. Shiozawa, S. Short, Y. Shustrov, P. Sinclair, B. Smith, R. J. Smith, M. Smy, J. T. Sobczyk, H. Sobel, M. Sorel, L. Southwell, P. Stamoulis, J. Steinmann, B. Still, Y. Suda, A. Suzuki, K. Suzuki, S. Y. Suzuki, Y. Suzuki, T. Szeglowski, R. Tacik, M. Tada, S. Takahashi, A. Takeda, Y. Takeuchi, H. A. Tanaka, M. M. Tanaka, I. J. Taylor, D. Terhorst, R. Terri, L. F. Thompson, A. Thorley, S. Tobayama, W. Toki, T. Tomura, Y. Totsuka, C. Touramanis, T. Tsukamoto, M. Tzanov, Y. Uchida, K. Ueno, A. Vacheret, M. Vagins, G. Vasseur, T. Wachala, A. V. Waldron, C. W. Walter, D. Wark, M. O. Wascko, A. Weber, R. Wendell, R. J. Wilkes, M. J. Wilking, C. Wilkinson, Z. Williamson, J. R. Wilson, R. J. Wilson, T. Wongjirad, Y. Yamada, K. Yamamoto, C. Yanagisawa, S. Yen, N. Yershov, M. Yokoyama, T. Yuan, A. Zalewska, J. Zalipska, L. Zambelli, K. Zaremba, M. Ziembicki, E. D. Zimmerman, M. Zito, J. Zmuda<a name='more'></a><blockquote class="abstract">The T2K collaboration reports a precision measurement of muon neutrino disappearance with an off-axis neutrino beam with a peak energy of 0.6 GeV. Near detector measurements are used to constrain the neutrino flux and cross section parameters. The Super-Kamiokande far detector, which is 295 km downstream of the neutrino production target, collected data corresponding to $3.01 \times 10^{20}$ protons on target. In the absence of neutrino oscillations, $205 \pm 17$ (syst.) events are expected to be detected and only 58 muon neutrino event candidates are observed. A fit to the neutrino rate and energy spectrum assuming three neutrino flavors, normal mass hierarchy and $\theta_{23}\leq \pi/4$ yields a best-fit mixing angle $\sin^2(2\theta_{23})=1.000$ and mass splitting $|\Delta m^2_{32}| =2.44 \times 10^{-3}$ eV$^2$/c$^4$. If $\theta_{23}\geq \pi/4$ is assumed, the best-fit mixing angle changes to $\sin^2(2\theta_{23})=0.999$ and the mass splitting remains unchanged.</blockquote>View original: <a href="http://arxiv.org/abs/1308.0465">http://arxiv.org/abs/1308.0465</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-7864374577692441602013-08-05T00:04:00.015-07:002013-08-05T00:04:33.822-07:001308.0474 (Jean-Philippe Lansberg et al.)<h2 class="title"><a href="http://arxiv.org/abs/1308.0474">Production of J/psi+eta(c) vs. J/psi+J/psi at the LHC: the impact of<br /> real-emission QCD corrections</a> [<a href="http://arxiv.org/pdf/1308.0474">PDF</a>]</h2>Jean-Philippe Lansberg, Hua-Sheng Shao<a name='more'></a><blockquote class="abstract">We proceed for the first time to the evaluation of the Born cross section for J/psi+eta(c) production, namely via g+g -> J/psi+eta(c)+g, and show that it has a harder P_T spectrum than the J/psi-pair yield at Born level. If one stuck to a comparison at Born level, one would conclude that J/psi+eta(c) production would surpass that of J/psi+J/psi at large P_T. This is nonetheless not the case since J/psi-pair production, as for single J/psi, receives leading-P_T contributions at higher orders in alpha_s. We also present the first evaluation of these leading-P_T next-to-leading order contributions. These are indeed significant for increasing P_T and are of essential relevance for comparison with forthcoming data. We also compute kinematic correlations relevant for double-parton-scattering studies. Finally, we evaluate the polarisation of a J/psi accompanied either by a eta(c) or a J/psi and another light parton. These results may be of great help to understand the polarisation of quarkonia produced at colliders.</blockquote>View original: <a href="http://arxiv.org/abs/1308.0474">http://arxiv.org/abs/1308.0474</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-64790761685066082072013-08-05T00:04:00.013-07:002013-08-05T00:04:33.082-07:001308.0493 (G. Consolati et al.)<h2 class="title"><a href="http://arxiv.org/abs/1308.0493">Characterization of positronium properties in doped liquid scintillators</a> [<a href="http://arxiv.org/pdf/1308.0493">PDF</a>]</h2>G. Consolati, D. Franco, S. Hans, C. Jollet, A. Meregaglia, S. Perasso, A. Tonazzo, M. Yeh<a name='more'></a><blockquote class="abstract">Ortho-positronium (o-Ps) formation and decay can replace the annihilation process, when positron interacts in liquid scintillator media. The delay induced by the positronium decay represents either a potential signature for anti-neutrino detection, via inverse beta decay, or to identify and suppress positron background, as recently demonstrated by the Borexino experiment. The formation probability and decay time of o-Ps depend strongly on the surrounding material. In this paper, we characterize the o-Ps properties in liquid scintillators as function of concentrations of gadolinium, lithium, neodymium, and tellurium, dopers used by present and future neutrino experiments. In particular, gadolinium and lithium are high neutron cross section isotopes, widely used in reactor anti-neutrino experiments, while neodymium and tellurium are double beta decay emitters, employed to investigates the Majorana neutrino nature. Future neutrino experiments may profit from the performed measurements to tune the preparation of the scintillator in order to maximize the o-Ps signature, and therefore the discrimination power.</blockquote>View original: <a href="http://arxiv.org/abs/1308.0493">http://arxiv.org/abs/1308.0493</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-71070600275594888352013-08-05T00:04:00.011-07:002013-08-05T00:04:32.145-07:001308.0532 (Nicholas Steinbrink et al.)<h2 class="title"><a href="http://arxiv.org/abs/1308.0532">Neutrino mass sensitivity by MAC-E-Filter based time-of-flight<br /> spectroscopy with the example of KATRIN</a> [<a href="http://arxiv.org/pdf/1308.0532">PDF</a>]</h2>Nicholas Steinbrink, Volker Hannen, Eric L. Martin, R. G. Hamish Robertson, Michael Zacher, Christian Weinheimer<a name='more'></a><blockquote class="abstract">The KATRIN experiment aims at a measurement of the neutrino mass with a 90 % C.L. sensitivity of 0.2 eV/c$^2$ by measuring the endpoint region of the tritium $\beta$ decay spectrum from a windowless gaseous molecular tritium source using an integrating spectrometer of the MAC-E-Filter type. We discuss the idea of using the MAC-E-Filter in a time-of-flight mode (MAC-E-TOF) in which the neutrino mass is determined by a measurement of the electron time-of-flight (TOF) spectrum that depends on the neutrino mass. MAC-E-TOF spectroscopy here is a very sensitive method since the $\beta$-electrons are slowed down to distinguishable velocities by the MAC-E-Filter. Their velocity depends strongly on their surplus energy above the electric retarding potential. Using MAC-E-TOF, a statistical sensitivity gain is expected. Because a small number of retarding-potential settings is sufficient for a complete measurement, in contrast to about 40 different retarding potentials used in the standard MAC-E-Filter mode, there is a gain in measurement time and hence statistical power. The improvement of the statistical uncertainty of the squared neutrino mass has been determined by Monte Carlo simulation to be a factor 5 for an ideal case neglecting background and timing uncertainty. Additionally, two scenarios to determine the time-of-flight of the $\beta$-electrons are discussed, which use the KATRIN detector for creating the stop signal and different methods for obtaining a start signal. These comprise the hypothetical case of an `electron tagger' which detects passing electrons with minimal interference and the more realistic case of `gated filtering', where the electron flux is periodically cut off by pulsing the pre-spectrometer potential.</blockquote>View original: <a href="http://arxiv.org/abs/1308.0532">http://arxiv.org/abs/1308.0532</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-90156760106420494482013-08-05T00:04:00.009-07:002013-08-05T00:04:31.234-07:001308.0533 (Zhi-Gang Wang)<h2 class="title"><a href="http://arxiv.org/abs/1308.0533">Analysis of strong decays of the charmed mesons $D_J(2580)$,<br /> $D_J^*(2650)$, $D_J(2740)$, $D^*_J(2760)$, $D_J(3000)$, $D_J^*(3000)$</a> [<a href="http://arxiv.org/pdf/1308.0533">PDF</a>]</h2>Zhi-Gang Wang<a name='more'></a><blockquote class="abstract">In this article, we tentatively identify the charmed mesons $D_J(2580)$, $D_J^*(2650)$, $D_J(2740)$, $D^*_J(2760)$, $D_J(3000)$, $D_J^*(3000)$ observed by the LHCb collaboration according to their spin, parity and masses, then study their strong decays to the ground state charmed mesons plus light pseudoscalar mesons with the heavy quark effective theory in the leading order approximation, and obtain explicit expressions of the decay widths. The ratios among the decay widths can be used to confirm or reject the assignments of the newly observed charmed mesons. The strong coupling constants in the decay widths can be fitted to the experimental data in the future at the LHCb, BESIII, KEK-B and $\rm{\bar{P}ANDA}$.</blockquote>View original: <a href="http://arxiv.org/abs/1308.0533">http://arxiv.org/abs/1308.0533</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0tag:blogger.com,1999:blog-45295562690452427.post-15429434491836346182013-08-05T00:04:00.007-07:002013-08-05T00:04:30.606-07:001308.0536 (Tsutomu T. Yanagida et al.)<h2 class="title"><a href="http://arxiv.org/abs/1308.0536">Bino-Higgsino Mixed Dark Matter in a Focus Point Gaugino Mediation</a> [<a href="http://arxiv.org/pdf/1308.0536">PDF</a>]</h2>Tsutomu T. Yanagida, Norimi Yokozaki<a name='more'></a><blockquote class="abstract">We investigate the neutralino dark matter in the focus point gaugino mediation model with the O(100) GeV gravitino. The thermal relic abundance of the neutralino with a sizable Higgsino fraction can explain the dark matter density at the present universe. The spin-independent cross section is marginally consistent with the current upper limit from the XENON 100 experiment, and the whole parameter region can be covered at the XENON1T experiment. We also discuss the origin of the gluino mass to wino mass ratio at around 3/8, which is crucial for the mild fine-tuning in the electroweak symmetry breaking sector. It is shown that the existence of the non-anomalous discrete R-symmetry can fix this ratio to 3/8.</blockquote>View original: <a href="http://arxiv.org/abs/1308.0536">http://arxiv.org/abs/1308.0536</a>C.P.R.http://www.blogger.com/profile/13598012384534951656noreply@blogger.com0