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Search for V+A Current in Top-Quark Decays in ppbar Collisions at sqrt[s] =1.96 TeV

Lancaster, M; Nurse, E; Waters, DCDFC; (2007) Search for V+A Current in Top-Quark Decays in ppbar Collisions at sqrt[s] =1.96 TeV. Physical Review Letters , 98 (7) , Article 072001. 10.1103/PhysRevLett.98.072001. Green open access

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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 pp̅ collisions at √s=1.96  TeV acquired by the upgraded Collider Detector at Fermilab. For the decay t→Wb→ℓνb (where 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.

Type: Article
Title: Search for V+A Current in Top-Quark Decays in ppbar Collisions at sqrt[s] =1.96 TeV
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.98.072001
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.98.072001
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/131823
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