The like-sign dimuon charge asymmetry at the Tevatron: corrections from B meson fragmentation
arXiv:1102.3148 · doi:10.1103/PhysRevD.84.014035
Abstract
The existing predictions for the like-sign dimuon charge asymmetry at the Tevatron are expressed in terms of parameters related to B mesons' mixing and inclusive production fractions. We show that in the realistic case when phase-space cuts are applied, the asymmetry depends also on the details of the production mechanism for the B mesons. In particular, it is sensitive to the difference in the fragmentation functions of B^0_d and B^0_s mesons. We estimate these fragmentation effects and find that they shift the theory prediction for this observable by approximately 10%. We also point out the approximately 20% sensitivity of the asymmetry depending on which set of values for the B meson production fractions is used: as measured at the Z pole or at the Tevatron. The impact of these effects on the extraction of A^s_{SL} from the DØmeasurement is presented.
arXiv comment7 pages, 2 figures. v2:journal version. Added Eq.22 and table 2 (were implicit in figs.1,2 in v1) and 3 ref's. Note Added about new measurements from LHCb and CDF that confirm our theoretical arguments to use the values of f_s and f_d from Z pole data
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