Measurement of the W boson helicity in top quark decays at D0
- Joint Institute for Nuclear Research, Dubna (Russian Federation)
- University of Oklahoma, Norman, Oklahoma 73019 (United States)
- Michigan State University, East Lansing, Michigan 48824 (United States)
We present a measurement of the fraction f{sub +} of right-handed W bosons produced in top quark decays, based on a candidate sample of tt events in the l+jets and dilepton decay channels corresponding to an integrated luminosity of 370 pb{sup -1} collected by the D0 detector at the Fermilab Tevatron pp Collider at {radical}(s)=1.96 TeV. We reconstruct the decay angle {theta}* for each lepton. By comparing the cos{theta}* distribution from the data with that for the expected background and signal for various values of f{sub +} (where we assume that the fraction of longitudinally-polarized W bosons has the standard model value of 0.70), we 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 +}=3.6x10{sup -4}.
- OSTI ID:
- 21010959
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 75, Issue 3; Other Information: DOI: 10.1103/PhysRevD.75.031102; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA). D0 Collaboration; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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