1201.6026 (Florian Miconi)

Search for WH associated production at Dø Tevatron    [PDF]

Florian Miconi

The Higgs mechanism introduced in 1964 gives a satisfactory solution to a
major problem of the standard model of elementary particles: the origin of the
mass. It predicts the existence of the Higgs scalar boson, which has not been
discovered experimentally yet. The Tevatron, a hadron accelerator based at
Fermi National Accelerator Laboratory near Chicago, has delivered data to its
two multi-purpose detectors CDF and DZERO since 1983 up to september 2011.
Leaving us about 11 fb-1 of data per experiment to analyze. Associated
production of a Higgs boson and a vector gauge boson W or Z is the main search
channel for a light standard Higgs boson (i.e. below 135 GeV/c2). Using data
collected by DZERO, we are looking for this production mode taking advantage of
sophisticated techniques to improve the signal sensitivity such as b-jet
identification and multivariate discriminants. In the end, a statistical
approach allows us to set an upper limit on the ratio between the observed
(resp. expected) Higgs production cross section and its theoretical cross
section. The latest result obtained in the WH channel using 8.5 f b-1 at DZERO
is 4.6 (resp. 3.5) for a 115 GeV/c2 Higgs boson.

View original: http://arxiv.org/abs/1201.6026