/ Experiment-HEP hep-ex/0608062

Search for V+A current in top quark decay in p anti-p collisions at s**(1/2) = 1.96-TeV

Abulencia, A. ; Adelman, Jahred A. ; Affolder, Anthony Allen ; Akimoto, T. ; Albrow, Michael G. ; Ambrose, D. ; Amerio, S. ; Amidei, Dante E. ; Anastassov, A. ; Anikeev, K. ; Annovi, A. ; Antos, J. ; Aoki, M. ; Apollinari, G. ; Arguin, Jean-Francois ; Arisawa, T. ; Artikov, A. ; Ashmanskas, William Joseph ; Attal, A. ; Azfar, F. ; Azzi-Bacchetta, P. ; Azzurri, Paolo ; Bacchetta, Nicola ; Badgett, W. ; Barbaro-Galtieri, Angela

Published in: Phys.Rev.Lett.
Year: 2007
Vol.: 98
Page No: 072001
Pages: 7

Abstract: We report an upper limit on the fraction of V+A current, $f_{V+A}$, in top quark decays, using approximately 700 pb$^{-1}$ of $p\bar{p}$ collisions at $\sqrt{s}$=1.96 TeV acquired by the upgraded Collider Detector at Fermilab. For the decay $t \to Wb \to \ell \nu b$ (where $\ell=e$ or $\mu$), the invariant mass of the charged lepton and the bottom quark jet is sensitive to the polarization of the $W$ boson. We determine $f_{V+A} = -0.06 \pm 0.25$ given a top quark mass of 175 GeV/$c^{2}$. We set an upper limit on $f_{V+A}$ of 0.29 at the 95% confidence level, which represents an improvement by a factor of two on the previous best direct limit.

Total numbers of views: 749
Numbers of unique views: 453
e-proceeding