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 (p) over bar collisions at root s=1.96 TeV acquired by the upgraded Collider Detector at Fermilab. For the decay t -> Wb ->l nu b (where l=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 +/- 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, an improvement by a factor of 2 on the previous best direct limit.

A., A., J., A., T., A., T., A., M. G., A., D., A., et al. (2007). Search for V + A current in top-quark decays in p(p)over-bar collisions at root s=1.96 TeV. PHYSICAL REVIEW LETTERS, 98(7), 072001-1-072001-7 [10.1103/PhysRevLett.98.072001].

Search for V + A current in top-quark decays in p(p)over-bar collisions at root s=1.96 TeV

CIOCCI, MARIA AGNESE;
2007-01-01

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 (p) over bar collisions at root s=1.96 TeV acquired by the upgraded Collider Detector at Fermilab. For the decay t -> Wb ->l nu b (where l=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 +/- 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, an improvement by a factor of 2 on the previous best direct limit.
2007
A., A., J., A., T., A., T., A., M. G., A., D., A., et al. (2007). Search for V + A current in top-quark decays in p(p)over-bar collisions at root s=1.96 TeV. PHYSICAL REVIEW LETTERS, 98(7), 072001-1-072001-7 [10.1103/PhysRevLett.98.072001].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/36390
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