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

Journal Article · Tue Aug 01 04:00:00 EDT 2006 · Phys.Rev.Lett.98:072001,2007

DOI:https://doi.org/10.1103/PhysRevLett.98.072001· OSTI ID:900379

Abulencia, A; Adelman, J; Affolder, T; Akimoto, T; Albrow, M G; Ambrose, D; Amerio, S; Amidei, D; Anastassov, A; Anikeev, K; Annovi, A

The authors 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 p{bar p} collisions at {radical}s = 1.96 TeV acquired by the upgraded Collider Detector at Fermilab. For the decay t {yields} wb {yields} {ell}vb (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. They determine f{sub V+A} = -0.06 {+-} 0.25 given a top quark mass of 175 GeV/c{sup 2}. They set an upper limit on f{sub 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.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 900379
• Report Number(s): FERMILAB-PUB-06-329-E; arXiv eprint number hep-ex/0608062
• Journal Information: Phys.Rev.Lett.98:072001,2007, Journal Name: Phys.Rev.Lett.98:072001,2007 Vol. 98; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DECAY
Experiment-HEP
FERMILAB COLLIDER DETECTOR
INTERMEDIATE BOSONS
LEPTONS
POLARIZATION
QUARKS
T QUARKS