Measurement of the CP-violation parameter of B0 mixing and decay with pp¯μμX data

V. M. Abazov et al. (D0Collaboration)
Phys. Rev. D 74, 092001 – Published 13 November 2006

Abstract

We measure the dimuon charge asymmetry A in pp¯ collisions at a center of mass energy s=1960GeV. The data was recorded with the D0 detector and corresponds to an integrated luminosity of approximately 1.0fb1. Assuming that the asymmetry A is due to asymmetric B0B¯0 mixing and decay, we extract the CP-violation parameter of B0 mixing and decay: (ϵB0)1+|ϵB0|2=AB04=0.0023±0.0011(stat)±0.0008(syst).AB0 is the dimuon charge asymmetry from decays of B0B¯0 pairs. The general case, with CP violation in both B0 and Bs0 systems, is also considered. Finally we obtain the forward-backward asymmetry that quantifies the tendency of μ+ to go in the proton direction and μ to go in the antiproton direction. The results are consistent with the standard model and constrain new physics.

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  • Received 11 September 2006

DOI:https://doi.org/10.1103/PhysRevD.74.092001

©2006 American Physical Society

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Vol. 74, Iss. 9 — 1 November 2006

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