Measurement of the W boson helicity in top quark decay at D0

Journal Article · Fri Sep 01 04:00:00 EDT 2006 · Phys.Rev.D75:031102,2007

OSTI ID:897897

Abazov, V M; Abbott, B; Abolins, M; Acharya, B S; Adams, M; Adams, T; Agelou, M; Aguilo, E; Ahn, S H; Ahsan, M; Alexeev, G D

The authors present a measurement of the fraction f{sub +} of right-handed W bosons produced in top quark decays, based on a candidate sample of t{bar t} events in the {ell}+jets and dilepton decay channels corresponding to an integrated luminosity of 370 pb{sup -1} collected by the D0 detector at the Fermilab Tevatron p{bar p} Collider at {radical}s = 1.96 TeV. They reconstruct the decay angle {theta}* for each lepton. By comparing the cos{theta}* distribution from the data with those for the expected background and signal for various values of f{sub +}, they find f{sub +} = 0.056 {+-} 0.080(stat) {+-} 0.057(syst). (f{sub +} < 0.23 at 95% C.L.), consistent with the standard model prediction of f{sub +} = 3.6 x 10{sup -4}.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 897897
• Report Number(s): FERMILAB-PUB-06-345-E; arXiv eprint number hep-ex/0609045
• Journal Information: Phys.Rev.D75:031102,2007, Journal Name: Phys.Rev.D75:031102,2007 Vol. 75; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
DECAY
DISTRIBUTION
Experiment-HEP
FERMILAB TEVATRON
FORECASTING
HELICITY
INTERMEDIATE BOSONS
LUMINOSITY
STANDARD MODEL
T QUARKS