Search for V+A current in top quark decay in ppbar collisions at sqrt{s}=1.96 TeV

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.

Submitted to Physical Review Letters

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