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arxiv: 1008.2153 · v2 · pith:2277UJM5new · submitted 2010-08-12 · ✦ hep-ph · hep-ex

Anomalous CP-Violation in B_s-Bbar_s Mixing Due to a Light Spin-One Particle

classification ✦ hep-ph hep-ex
keywords anomalousparticlelightmassmeasurementmixingpredictionaccount
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The recent measurement of the like-sign dimuon charge asymmetry in semileptonic b-hadron decays by the D0 Collaboration is about 3 sigmas away from the standard-model prediction, hinting at the presence of CP-violating new physics in the mixing of B_s mesons. We consider the possibility that this anomalous result arises from the contribution of a light spin-1 particle. Taking into account various experimental constraints, we find that the effect of such a particle with mass below the b-quark mass can yield a prediction consistent with the anomalous D0 measurement within its one-sigma range.

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