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Evidence for an anomalous like-sign dimuon charge asymmetry
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2010 (English)In: Physical Review D, ISSN 1550-7998, Vol. 82, no 3, 032001- p.Article in journal (Refereed) Published
Abstract [en]

We measure the charge asymmetry A 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) = -0.00957 +/- 0.00251 (stat) +/- 0.00146 (syst). This result 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.

Place, publisher, year, edition, pages
2010. Vol. 82, no 3, 032001- p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-135198DOI: 10.1103/PhysRevD.82.032001ISI: 000280963800001OAI: oai:DiVA.org:uu-135198DiVA: diva2:374712
Available from: 2010-12-06 Created: 2010-12-06 Last updated: 2010-12-06Bibliographically approved

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