Measurement of the W boson helicity in top quark decays using 5.4 fb$$^{\boldsymbol{-1}}$$ of $$\boldsymbol{p\bar{p}}$$ collision data

Journal Article · Mon Nov 01 04:00:00 EDT 2010 · Submitted to Phys.Rev.D

OSTI ID:1004303

Abazov, Victor Mukhamedovich; Abbott, Braden Keim; Acharya, Bannanje Sripath; Adams, Mark Raymond; Adams, Todd; Alexeev, Guennadi D; Alkhazov, Georgiy D; Alton, Andrew K; Alverson, George O; Alves, Gilvan Augusto; Ancu, Lucian Stefan

We present a measurement of the helicity of the W boson produced in top quark decays using t{bar t} decays in the {ell}+jets and dilepton final states selected from a sample of 5.4 fb{sup -1} of collisions recorded using the D0 detector at the Fermilab Tevatron p{bar p} collider. We measure the fractions of longitudinal and right-handed W bosons to be f{sub 0} = 0.669 {+-} 0.102 [{+-}0.078 (stat.) {+-} 0.065 (syst.)] and f{sub +} = 0.023 {+-} 0.053 [{+-}0.041 (stat.){+-}0.034 (syst.)], respectively. This result is consistent at the 98% level with the standard model. A measurement with f{sub 0} fixed to the value from the standard model yields f{sub +} = 0.010 {+-} 0.037 [{+-}0.022 (stat.) {+-} 0.030 (syst.)].

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1004303
• Report Number(s): FERMILAB-PUB-10-484-E; arXiv eprint number arXiv:1011.6549
• Journal Information: Submitted to Phys.Rev.D, Journal Name: Submitted to Phys.Rev.D
• Country of Publication: United States
• Language: English

Related Subjects

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