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Search for right-handed W bosons in top quark decay

Baringer, Philip S.
Bean, Alice
Christofek, L.
Coppage, Don
Gardner, J.
Hensel, Carsten
Jabeen, S.
Wilson, Graham Wallace
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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 tt-bar events in the lepton+jets decay mode. These data correspond to an integrated luminosity of 230  pb(−1), collected by the D0 detector at the Fermilab Tevatron pp-bar Collider at s√=1.96  TeV. We use a constrained fit to reconstruct the kinematics of the tt-bar and decay products, which allows for the measurement of the leptonic decay angle θ∗ for each event. By comparing the cosθ∗ 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(+)=3.6×10(−4).
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This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.72.011104.
Date
2005-07-29
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American Physical Society
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V. M. Abazov et al. (D0 Collaboration). (2005). "Search for right-handed W bosons in top quark decay." Physical Review D, 72(1):011104. http://dx.doi.org/10.1103/PhysRevD.72.011104.
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