Evidence for an Anomalous
Like-Sign Dimuon
Charge Asymmetry

The DØ Collaboration

May 2010

Summary

On May 16, 2010, the DØ Collaboration submitted a paper to Physical Review D announcing the first evidence for anomalous CP-violation in the mixing of neutral B mesons, seen in 6.1 fb-1 of proton-antiproton collisions at √s = 1.96 TeV:      arXiv.org:1005.2757,   plots

Abstract | We measure the charge asymmetry A of like-sign dimuon events in 6.1 fb-1 of pp collisions recorded with the DØ 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 (stat) ± 0.00146 (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. | | |

Talks

•  Fermilab "Wine and Cheese" seminar | Guennadi Borissov, Lancaster University | May 14, 2010
•  Flavor Physics and CP Violaton conference, Turin | Gustaaf Brooijmans, Columbia University | May 25, 2010
•  LHCb Experiment meeting, CERN | Iain Bertram, Lancaster University | May 25, 2010
•  Johns Hopkins workshop, Baltimore | Dmitri Tsybychev, SUNY Stony Brook | May 25, 2010
•  University of Chicago seminar | Mark Williams, Lancaster University | June 7, 2010
•  SLAC seminar | Rick Van Kooten, Indiana University | June 8, 2010
•  Physics at the LHC conference, DESY | Iain Bertram, Lancaster University | June 11, 2010
•  CERN seminar | Bruce Hoeneisen, Universidad San Francisco de Quito, Ecuador | June 14, 2010
•  BNL seminar | Dmitri Tsybychev, SUNY Stony Brook | June 2010
•  Rencontres de Blois | TBA | July 2010

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Fermilab Today – result of the week
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Questions? – Please contact DZero's co-spokespeople, Dmitri Denisov and Stefan Söldner-Rembold
Last update: June 2, 2010