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

Abstract

Following updated and extended measurements of the full angular distribution of the decay $$Λ_b → Λ( → pπ^₋)μ^+μ^₋$$ 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 $$\mathcal{C}_9$$ and $$\mathcal{C}_{10}$$ 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 $$\mathit{B}$$-meson decays. We provide a detailed analysis of the impact of the partial angular distribution, the full angular distribution, and the $$Λ_b → Λμ^+μ^₋$$ branching fraction on the Wilson coefficients. In this process, we are also able to constrain the size of the production polarization of the $$Λ_b$$ baryon at LHCb.

Authors:
ORCiD logo; ORCiD logo; ORCiD logo
Publication Date:
Research Org.:
Univ. of Arizona, Tucson, AZ (United States)
Sponsoring Org.:
Royal Society; USDOE Office of Science (SC), High Energy Physics (HEP); German Research Foundation (DFG)
OSTI Identifier:
1601046
Alternate Identifier(s):
OSTI ID: 1801910
Grant/Contract Number:  
SC0009913; DY130/1-1
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 101 Journal Issue: 3; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Astronomy & Astrophysics; Physics

Citation Formats

Blake, Thomas, Meinel, Stefan, and van Dyk, Danny. Bayesian analysis of b → s μ + μ − Wilson coefficients using the full angular distribution of Λ b → Λ ( → p π − ) μ + μ − decays. United States: N. p., 2020. Web. doi:10.1103/PhysRevD.101.035023.
Blake, Thomas, Meinel, Stefan, & van Dyk, Danny. Bayesian analysis of b → s μ + μ − Wilson coefficients using the full angular distribution of Λ b → Λ ( → p π − ) μ + μ − decays. United States. https://doi.org/10.1103/PhysRevD.101.035023
Blake, Thomas, Meinel, Stefan, and van Dyk, Danny. Wed . "Bayesian analysis of b → s μ + μ − Wilson coefficients using the full angular distribution of Λ b → Λ ( → p π − ) μ + μ − decays". United States. https://doi.org/10.1103/PhysRevD.101.035023.
@article{osti_1601046,
title = {Bayesian analysis of b → s μ + μ − Wilson coefficients using the full angular distribution of Λ b → Λ ( → p π − ) μ + μ − decays},
author = {Blake, Thomas and Meinel, Stefan and van Dyk, Danny},
abstractNote = {Following updated and extended measurements of the full angular distribution of the decay $Λ_b → Λ( → pπ^₋)μ^+μ^₋$ 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 $\mathcal{C}_9$ and $\mathcal{C}_{10}$ 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 $\mathit{B}$-meson decays. We provide a detailed analysis of the impact of the partial angular distribution, the full angular distribution, and the $Λ_b → Λμ^+μ^₋$ branching fraction on the Wilson coefficients. In this process, we are also able to constrain the size of the production polarization of the $Λ_b$ baryon at LHCb.},
doi = {10.1103/PhysRevD.101.035023},
journal = {Physical Review D},
number = 3,
volume = 101,
place = {United States},
year = {2020},
month = {2}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevD.101.035023

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