# Measurement of the CP-violation parameter of B$^0$ mixing and decay with $p\bar{p} \to \mu\mu X$ data

Abstract : We measure the dimuon charge asymmetry A in pp(bar) collisions at a center of mass energy sqrt{s} = 1960 GeV. The data was recorded with the D0 detector and corresponds to an integrated luminosity of approximately 1.0 fb-1. Assuming that the asymmetry A is due to asymmetric B^0 <-> B(bar)^0 mixing and decay, we extract the CP-violation parameter of B^0 mixing and decay: Re(epsilon_B^0)(1 + |epsilon_B^0|^2) = A_B^0/4 = -0.0023 +/- 0.0011 (stat) +/- 0.0008 (syst). A_B^0 is the dimuon charge asymmetry from decays of B^0 B(bar)^0 pairs. The general case, with CP violation in both B^0 and B_s^0 systems, is also considered. Finally we obtain the forward-backward asymmetry that quantifies the tendency of mu+ to go in the proton direction and mu- to go in the anti-proton direction. The results are consistent with the standard model and constrain new physics.
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Journal articles

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Submitted on : Monday, September 11, 2006 - 11:25:38 AM
Last modification on : Sunday, June 26, 2022 - 11:46:13 AM

### Citation

V.M. Abazov, B. Abbott, M. Abolins, B.S. Acharya, M. Adams, et al.. Measurement of the CP-violation parameter of B$^0$ mixing and decay with $p\bar{p} \to \mu\mu X$ data. Physical Review D, American Physical Society, 2006, 74, pp.092001. ⟨10.1103/PhysRevD.74.092001⟩. ⟨in2p3-00092470⟩

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