Physics – High Energy Physics
Scientific paper
Apr 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005iche.conf.1162s&link_type=abstract
HIGH ENERGY PHYSICS, ICHEP 2004. Proceedings of the 32nd International Conference. Held 16-22 August 2004 in Beijing, China. Edi
Physics
High Energy Physics
Scientific paper
We present a preliminary measurement of the right-handed helicity state fraction of W bosons in top quark decays, f+, using data collected with the DØ detector in pbar {p} collisions at center of mass energy of √ {s} = 1.96 TeV. The data sample consists of tbar {t} events in the lepton plus jet channel, where one of the W bosons decays leptonically and the other hadronically, with an integrated luminosity of 168.7 pb-1 and 158.4 pb-1 for the electron and muon channels respectively. Two parallel analysis are carried out: a topological analysis, in which top quark events are identified by their kinematic properties, and a b-tag analysis, in which jets arising form b quarks are identified using secondary vertices. Based on the angular distribution of the lepton and the direction of the W boson when boosted to its rest frame, we set an upper limit of f+ < 0.24, (90% CL) and f+ < 0.24, (90% CL) in the topological and b-tag analyses respectively.
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