Measurement of the semileptonic charge asymmetry in B.sup.0./sup. meson mixing with the D0 detector

0384606 - FZÚ 2013 RIV US eng J - Journal Article
Abazov, V. M. - Abbott, B. - Acharya, B.S. - Kupčo, Alexander - Lokajíček, Miloš … Total 385 authors
Measurement of the semileptonic charge asymmetry in B⁰ meson mixing with the D0 detector.
Physical Review D: Particles, Fields, Gravitation and Cosmology. Roč. 86, č. 7 (2012), "072009-1"-"072009-21". ISSN 1550-7998
R&D Projects: GA MŠMT LA08047; GA MŠMT(CZ) LG12006
Institutional research plan: CEZ:AV0Z10100502
Keywords : D0 * detector * asymmetry * mesons
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 4.691, year: 2012
http://link.aps.org/doi/10.1103/PhysRevD.86.072009

We present a measurement of the semileptonic mixing asymmetry for B0 mesons, a^d_{sl}, using two independent decay channels: B0 -> mu+D-X, with D- -> K+pi-pi-/ and B0 -> mu+D*-X, with D*- -> antiD0 pi-, antiD0 -> K+pi- (and charge conjugate processes). We use a data sample corresponding to 10.4 fb^{-1} of ppbar collisions at sqrt(s) = 1.96 TeV, collected with the D0 experiment at the Fermilab Tevatron collider. We extract the charge asymmetries in these two channels as a function of the visible proper decay length (VPDL) of the B0 meson, correct for detector-related asymmetries using data-driven methods, and account for dilution from charge-symmetric processes using Monte Carlo simulation. The final measurement combines four signal VPDL regions for each channel, yielding a^d_{sl} = [0.68 /pm 0.45 /text{(stat.)} /pm 0.14 /text{(syst.)}]%. This is the single most precise measurement of this parameter, with uncertainties smaller than the current world average of B factory measurements
Permanent Link: http://hdl.handle.net/11104/0214193