Faking Bs→μ+μ-
Abstract
Recent evidence from observation of the flavor-changing neutral current decay Bs0→μ+μ- by the LHCb Collaboration B(Bs0→μ+μ-)=(3.2-1.2+1.5)×10-9 is consistent with the latest standard model prediction BSM(Bs0→μ+μ-)=(3.23±0.27)×10-9. While new physics can still affect this decay amplitude, its contribution is certainly not the dominant one. We analyze branching ratios of the decays Bs0→μ+μ-X, with X=γ or νν¯, which can mimic Bs0→μ+μ- on portions of the parameter space where X is soft. Since detection efficiency of γ or νν¯ in modern charm-physics experiments is quite low in that region, those processes could be misidentified as Bs0→μ+μ-. We perform a model-independent standard model calculation of those processes incorporating heavy quark and chiral symmetries of QCD concentrating on the soft-X region. We show that misidentification of the considered processes can only boost the Bs0→μ+μ- rate by less than a percent.
- Publication:
-
Physical Review D
- Pub Date:
- April 2013
- DOI:
- 10.1103/PhysRevD.87.074028
- arXiv:
- arXiv:1212.4166
- Bibcode:
- 2013PhRvD..87g4028A
- Keywords:
-
- 14.40.Nd;
- 12.39.Fe;
- 12.39.Hg;
- Bottom mesons;
- Chiral Lagrangians;
- Heavy quark effective theory;
- High Energy Physics - Phenomenology;
- High Energy Physics - Experiment
- E-Print:
- 14 pages, 7 figures, .v2 changes : fixed diagram TeX, small notation change, fixed reference