Evidence for an Anomalous Like-Sign Dimuon Charge Asymmetry

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Data

2010-08-16

Autores

Abazov, V. M.
Abbott, B.
Abolins, M.
Acharya, B. S.
Adams, M.
Adams, T.
Aguilo, E.
Alexeev, G. D.
Alkhazov, G.
Alton, A.

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Amer Physical Soc

Resumo

We measure the charge asymmetry A =(N(++) -N(--))/(N(++) + N(--)) of like-sign dimuon events in 6.1 fb(-1) of p (p) over bar collisions recorded with the D0 detector at a center-of-mass energy root s = 1: 96 TeV at the Fermilab Tevatron collider. From A we extract the like-sign dimuon charge asymmetry in semileptonic b-hadron decays: A(sl)(b) = -0.009 57 +/- 0.00251(stat) +/- 0.001 46(sys). It differs by 3.2 standard deviations from the standard model prediction A(sl)(b)(SM) = (-2.3(-0.6)(+0.5)) x 10(-4), and provides first evidence of anomalous CP violation in the mixing of neutral B mesons.

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Physical Review Letters. College Pk: Amer Physical Soc, v. 105, n. 8, p. 7, 2010.