期刊
PHYSICAL REVIEW LETTERS
卷 109, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.109.041801
关键词
-
资金
- Netherlands Organisation for Scientific Research (NWO)
- Foundation for Fundamental Research on Matter (FOM)
We have recently seen new upper bounds for B-s(0) -> mu(+) mu(-), a key decay to search for physics beyond the standard model. Furthermore a nonvanishing decay width difference Delta Gamma(s) of the B-s system has been measured. We show that Delta Gamma(s) affects the extraction of the B-s(0) -> mu(+) mu(-) branching ratio and the resulting constraints on the new physics parameter space and give formulas for including this effect. Moreover, we point out that Delta Gamma(s) provides a new observable, the effective B-s(0) -> mu(+) mu(-) lifetime tau(mu+) (mu-), which offers a theoretically clean probe for new physics searches that is complementary to the branching ratio. Should the B-s(0) -> mu(+) mu(-) branching ratio agree with the standard model, the measurement of tau(mu+) (mu-), which appears feasible at upgrades of the Large Hadron Collider experiments, may still reveal large new physics effects.
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