Search for V+A Current in Top-Quark Decays in pp Collisions at {radical}(s)=1.96 TeV

Journal Article · Fri Feb 16 04:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.98.072001· OSTI ID:20955465

Abulencia, A; Budd, S; Ciobanu, C I; Errede, D; Errede, S; Gerberich, H; Grundler, U; Junk, T R; Kraus, J; Marino, C P; Martin, A; Pitts, K; Rogers, E; Taffard, A; Veramendi, G; Zhang, X ^[1]; Adelman, J; Brubaker, E; Fedorko, W T; Furic, I ^[2]

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1. University of Illinois, Urbana, Illinois 61801 (United States)
2. Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637 (United States)

We report an upper limit on the fraction of V+A current, f{sub V+A}, in top-quark decays, using approximately 700 pb{sup -1} of pp collisions at {radical}(s)=1.96 TeV acquired by the upgraded Collider Detector at Fermilab. For the decay t{yields}Wb{yields}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{sub V+A}=-0.06{+-}0.25 given a top-quark mass of 175 GeV/c{sup 2}. We set an upper limit on f{sub V+A} of 0.29 at the 95% confidence level, an improvement by a factor of 2 on the previous best direct limit.

• OSTI ID: 20955465
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 7 Vol. 98; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
B QUARKS
FERMILAB COLLIDER DETECTOR
GEV RANGE 100-1000
LEPTONS
MASS
PARTICLE DECAY
POLARIZATION
PROTON-PROTON INTERACTIONS
T QUARKS
TEV RANGE 01-10
W MINUS BOSONS
W PLUS BOSONS