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Search for right-handed W bosons in top quark decay (2006)

Abstract

We present a measurement of the fraction f+ of right-handed W bosons produced in top quark decays, based on a candidate sample of $t\bar{t}$ events in the lepton+jets decay mode. These data correspond to an integrated luminosity of 230pb$^{-1}$, collected by the DO detector at the Fermilab Tevatron $p\bar{p}$ Collider at \sqrt{s}$=1.96 TeV. We use a constrained fit to reconstruct the kinematics of the $t\bar{t}$ and decay products, which allows for the measurement of the leptonic decay angle $\theta^*$ for each event. By comparing the $\cos\theta^*$ distribution from the data with those for the expected background and signal for various values of f+, we find f+=0.00+-0.13(stat)+-0.07(syst). This measurement is consistent with the standard model prediction of f+=3.6x10$^{-4}$.

Publication details

Download	http://hal.in2p3.fr/in2p3-00024137/en/
Publisher	HAL - CCSd - CNRS
Contributors	Sylvie Florès
Repository	CCSd/HAL : e-articles server (based on gBUS) (France)
Keywords	Physics/High Energy Physics - Experiment
Type	ART_ACL
Coverage	intermediate boson production; quark decay; elementary particle jets; proton-proton inclusive interactions; meson leptonic decay; standard model; high-energy elementary particle interactions