PhysRevD.104.035029.pdf (779.14 kB)
Implications of new evidence for lepton-universality violation in b ?sl+l- decays
Version 2 2023-06-12, 07:47
Version 1 2023-06-10, 03:13
journal contribution
posted on 2023-06-12, 07:47 authored by Li-Sheng Geng, Benjamín Grinstein, Sebastian JaegerSebastian Jaeger, Shuang-Yi Li, Jorge Martin Camalich, Rui-Xiang ShiMotivated 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?µ+µ- 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 RK, RK*, and Bs?µµ alone results in a discrepancy with the Standard Model at 4.0s, 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 ~5s 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 Bs?µ+µ-, 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(Bs?µ+µ-)=(2.8±0.3)×10-9.
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Physical Review DISSN
2470-0010Publisher
American Physical SocietyExternal DOI
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3Volume
104Page range
1-9Article number
a035029Department affiliated with
- Physics and Astronomy Publications
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2022-04-25First Open Access (FOA) Date
2022-04-25First Compliant Deposit (FCD) Date
2022-04-22Usage metrics
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