Search for right-handed W bosons in top quark decay

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Abazov, V. M.
Abbott, B.
Abolins, M.
Acharya, B. S.
Adams, M.
Adams, T.
Agelou, M.
Agram, J. L.
Ahn, S. H.
Ahsan, M.
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We present a measurement of the fraction f+ of right-handed W bosons produced in top quark decays, based on a candidate sample of tt̄ events in the lepton+jets decay mode. These data correspond to an integrated luminosity of 230pb-1, collected by the D0 detector at the Fermilab Tevatron pp̄ Collider at s=1.96TeV. We use a constrained fit to reconstruct the kinematics of the tt̄ and decay products, which allows for the measurement of the leptonic decay angle θ* for each event. By comparing the cos θ* 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. © 2005 The American Physical Society.
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Physical Review D - Particles, Fields, Gravitation and Cosmology, v. 72, n. 1, p. 1-8, 2005.