期刊
PHYSICAL REVIEW D
卷 104, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.104.035029
关键词
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资金
- National Natural Science Foundation of China [11735003, 11975041, 11961141004]
- Academic Excellence Foundation of BUAA
- Fundamental Research Funds for the Central Universities
- U.S. Department of Energy [DE-SC0009919]
- U.K. Science and Technology Facilities Council [ST/P000819/1, ST/T00102X/1]
- Spanish MINECO through the Ramon y Cajal Program [RYC-2016-20672, PGC2018-102016A-I00]
Motivated by new evidence for new physics in b -> sll transitions, including clean lepton-universality ratios and purely leptonic Bs -> mu(+)mu(-) decay measurements, a discrepancy with the Standard Model at 4.0 sigma has been quantified. Different scenarios, such as purely left-handed or purely axial coupling to muons, show a 5 sigma pull from the Standard Model. The analysis of new-physics contributions with both vector and axial-vector couplings to muons has a more restricted allowed region, primarily due to the more precise measurement of Bs -> mu(+) mu(-) and inclusion of angular observables data.
Motivated by renewed evidence for new physics in b -> sll transitions in the form of LHCb's new measurements of theoretically clean lepton-universality ratios and the purely leptonic Bs -> mu(+)mu(-) decay, we quantify the combined level of discrepancy with the Standard Model and fit values of short-distance Wilson coefficients. A combination of the clean observables R-K, R-K*, and B-s -> mu mu alone results in a discrepancy with the Standard Model at 4.0 sigma, up from 3.5s in 2017. One-parameter scenarios with purely left-handed or with purely axial coupling to muons fit the data well and result in a -> 5 sigma pull from the Standard Model. In a two-parameter fit of new-physics contributions with both vector and axial-vector couplings to muons the allowed region is much more restricted than in 2017, principally due to the much more precise result on B-s -> mu(+) mu(-), which probes the axial coupling to muons. Including angular observables data restricts the allowed region further. A by-product of our analysis is an updated average of BR(B-s -> mu(+) mu(-)) = (2.8 +/- 0.3) x 10(-9).
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