Evidence for an anomalous like-sign dimuon charge asymmetry

2010/05/16 by The D0 Collaboration, V. M. Abazov · 1 voice
Physics and Astronomy · #hep-ex

paper · pdf · doi:10.1103/physrevd.82.032001

published as Phys.Rev.D82:032001,2010 · Submitted to Phys. Rev. D

Abstract

We measure the charge asymmetry A of like-sign dimuon events in 6.1 fb^-1 of pp collisions recorded with the D0 detector at a center-of-mass energy √(s) = 1.96 TeV at the Fermilab Tevatron collider. From A, we extract the like-sign dimuon charge asymmetry in semileptonic b-hadron decays: \aslb = -0.00957 ± 0.00251 (\rm stat) ± 0.00146 (\rm syst). This result differs by 3.2 standard deviations from the standard model prediction \aslb(SM) = (-2.3^+0.5_-0.6) × 10^-4 and provides first evidence of anomalous CP-violation in the mixing of neutral B mesons.

Discussions

• Evidence for something unexpected from D0 in CP physics - but may still be just a fluctuation again - see http://arxiv.org/abs/1005.2757 [bsky, 0 points, 0 comments]

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