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Measurement of the charge asymmetry in semileptonic B-s(0) decays
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2007 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 98, no 15, 151801- p.Article in journal (Refereed) Published
Abstract [en]

We have performed the first direct measurement of the time-integrated flavor untagged charge asymmetry in semileptonic B-s(0) decays A(SL)(s,unt) by comparing the decay rate of B-s(0) -> mu(+) D-s(-) nu X, where D-s(-) -> phi pi(-) and phi -> K+K-, with the charge-conjugate (B) over bar (0)(s) decay rate. This sample was selected from 1: 3 fb(-1) of data collected by the D0 experiment in run II of the Fermilab Tevatron collider. We obtain A(SL)(s,unt) = [1.23 +/- 0.97(stat) +/- 0.17(syst)] x 10(-2). Assuming that Delta m(s)/(Gamma) over bar (s) >> 1, this result can be translated into a measurement of the CP-violating phase in B-s(0) mixing: Delta Gamma(s)/Delta m(s) tan phi(s) = [2.45 +/- 1.93(stat) +/- 0.35(syst)] x 10(-2).

Place, publisher, year, edition, pages
2007. Vol. 98, no 15, 151801- p.
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-145179DOI: 10.1103/PhysRevLett.98.151801ISI: 000245691400014OAI: oai:DiVA.org:uu-145179DiVA: diva2:395545
Available from: 2011-02-07 Created: 2011-02-07 Last updated: 2011-02-07Bibliographically approved

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