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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
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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Baringer_7-29-2005.pdf
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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.