Measurement of the W boson helicity in top quark decays using 5.4 fb.sup.-1./sup. of ppbar collision data

0367578 - FZÚ 2013 RIV US eng J - Journal Article
Abazov, V. M. - Abbott, B. - Acharya, B.S. - Kupčo, Alexander - Lokajíček, Miloš … Total 428 authors
Measurement of the W boson helicity in top quark decays using 5.4 fb^-1 of ppbar collision data.
Physical Review D: Particles, Fields, Gravitation and Cosmology. Roč. 83, č. 3 (2011), "032009-1"-"032009-17". ISSN 1550-7998
R&D Projects: GA MŠMT LA08047
Institutional research plan: CEZ:AV0Z10100502
Keywords : Tevatron * D0 * dilepton
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 4.558, year: 2011

We present a measurement of the helicity of the W boson produced in top quark decays using t (t) over bar decays in the l + jets and dilepton final states selected from a sample of 5.4 fb(-1) of collisions recorded using the D0 detector at the Fermilab Tevatron p (p) over bar collider. We measure the fractions of longitudinal and right-handed W bosons to be f(0) = 0.669 +/- 0.102[+/- 0.078(stat.) +/- 0.065(syst.) +/- and f(+) = 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(0) fixed to the value from the standard model yields f(+) = 0.010 +/- 0.037[+/- 0.022(stat.) +/- 0.030(syst.).].
Permanent Link: http://hdl.handle.net/11104/0202204