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Physical Review D 86 (2012) 072009
Measurement of the semileptonic charge asymmetry in B0 meson mixing with the D0 detector
V.M. Abazov, M.-C. Cousinou1, A. Duperrin1, W. Geng1, E. Kajfasz1, S. Kermiche1, E. Nagy1, N. Osman1, G. Grenier2, T. Kurca2, P. Lebrun2, P. Verdier2, F. Badaud3, P. Gay3, Ph. Gris3, J.-F. Grivaz4, T. Guillemin4, M. Jaffré4, P. Pétroff4, H. Li5, G. Sajot5, J. Stark5
D0 Collaboration(s)
(2012)

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 Carlosimulation. The final measurement combines four signal VPDL regions for eachchannel, yielding a^d_{sl} = [0.68 \pm 0.45 \text{(stat.)} \pm 0.14\text{(syst.)}]%. This is the single most precise measurement of thisparameter, with uncertainties smaller than the current world average of Bfactory measurements
1 :  CPPM - Centre de Physique des Particules de Marseille
2 :  IPNL - Institut de Physique Nucléaire de Lyon
3 :  LPC - Laboratoire de Physique Corpusculaire [Clermont-Ferrand]
4 :  LAL - Laboratoire de l'Accélérateur Linéaire
5 :  LPSC - Laboratoire de Physique Subatomique et de Cosmologie
Physique/Physique des Hautes Energies - Expérience
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/1208.5813