Measuring anomalous \$Wtb\$ couplings at \$e^-p\$ collider    [PDF]

Sukanta Dutta, Ashok Goyal, Mukesh Kumar, Bruce Mellado
We study the physics potential of the proposed LHeC by estimating the accuracy with which it can measure the anomalous \$Wtb\$ couplings in the single anti-top quark production through \$e^-p\$ collision. We consider the generic lowest order CP conserving Lagrangian for the \$Wtb\$ interaction which allows a right-handed vector, as well as left- or right-handed tensor couplings. We examine the one dimensional distributions of the various kinematic observables and their asymmetries corresponding to all anomalous couplings in both hadronic and leptonic decay modes of \$W^-\$. We find that the 95\$%\$ C.L. exclusion contours on the two dimensional plane of anomalous couplings associated with the left- and right-handed vector and tensor currents are sensitive at an order of magnitude of \$\sim 10^{-3} - 10^{-2}\$ with 100 fb\$^{-1}\$ data. Further, adoption of the optimum observable method, results in an enhancement in the sensitivity of the left handed anomalous couplings by an order of magnitude and also provides their error correlations.
View original: http://arxiv.org/abs/1307.1688