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Search for V+A Current in Top Quark Decay in $p\bar{p}$ Collisions at $\sqrt{s}$ = 1.96 TeV

Abstract : We report an upper limit on the fraction of V+A current, fV+A, in top-quark decays, using approximately 700 pb-1 of p[overline p] collisions at sqrt(s)=1.96 TeV acquired by the upgraded Collider Detector at Fermilab. For the decay t-->Wb-->[script-l]nub (where [script-l]=e or µ), the invariant mass of the charged lepton and the bottom quark jet is sensitive to the polarization of the W boson. We determine fV+A=-0.06±0.25 given a top-quark mass of 175 GeV/c2. We set an upper limit on fV+A of 0.29 at the 95% confidence level, an improvement by a factor of 2 on the previous best direct limit.
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http://hal.in2p3.fr/in2p3-00133633
Contributor : Dominique Girod <>
Submitted on : Tuesday, February 27, 2007 - 11:03:32 AM
Last modification on : Wednesday, May 27, 2020 - 7:20:03 PM
Long-term archiving on: : Tuesday, April 6, 2010 - 10:58:41 PM

Citation

A. Abulencia, J. Adelman, T. Affolder, T. Akimoto, M. G. Albrow, et al.. Search for V+A Current in Top Quark Decay in $p\bar{p}$ Collisions at $\sqrt{s}$ = 1.96 TeV. Physical Review Letters, American Physical Society, 2007, 98, pp.072001. ⟨10.1103/PhysRevLett.98.072001⟩. ⟨in2p3-00133633⟩

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