Bayesian analysis of b → s μ + μ − Wilson coefficients using the full angular distribution of Λ b → Λ ( → p π − ) μ + μ − decays

Following updated and extended measurements of the full angular distribution of the decay Λb→Λ(→pπ−)μ+μ− by the LHCb collaborations, as well as a new measurement of the Λ→pπ− decay asymmetry parameter by the BESIII collaboration, we study the impact of these results on searches for nonstandard effec...

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Bibliographic Details
Published in:Physical review. D 2020-02, Vol.101 (3), Article 035023
Main Authors: Blake, Thomas, Meinel, Stefan, van Dyk, Danny
Format: Article
Language:English
Subjects:
Angular distribution
Anomalies
Bayesian analysis
Coefficients
Impact analysis
Parameters
Particle decay
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Summary:Following updated and extended measurements of the full angular distribution of the decay Λb→Λ(→pπ−)μ+μ− by the LHCb collaborations, as well as a new measurement of the Λ→pπ− decay asymmetry parameter by the BESIII collaboration, we study the impact of these results on searches for nonstandard effects in exclusive b→sμ+μ− decays. To this end, we constrain the Wilson coefficients C9 and C10 of the numerically leading dimension-six operators in the weak effective Hamiltonian, in addition to the relevant nuisance parameters. In stark contrast to previous analyses of this decay mode, the changes in the updated experimental results lead us to find very good compatibility with both the Standard Model and with the b→sμ+μ− anomalies observed in rare B-meson decays. We provide a detailed analysis of the impact of the partial angular distribution, the full angular distribution, and the Λb→Λμ+μ− branching fraction on the Wilson coefficients. In this process, we are also able to constrain the size of the production polarization of the Λb baryon at LHCb.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.101.035023