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

Blake, Thomas; Meinel, Stefan; van Dyk, Danny

doi:10.1103/PhysRevD.101.035023

Title: Bayesian analysis of $b \to s μ^{+} μ^{-}$ Wilson coefficients using the full angular distribution of $Λ_{b} \to Λ (\to p π^{-}) μ^{+} μ^{-}$ 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:

;

Publication Date:: Wed Feb 19 00:00:00 EST 2020

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.

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                    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

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                    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.

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@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         = {Wed Feb 19 00:00:00 EST 2020},

  month        = {Wed Feb 19 00:00:00 EST 2020}

}

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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

Citation Formats

Weak decays beyond leading logarithms journal, October 1996

General analysis of B ¯ → K ¯ ( * ) ℓ + ℓ − decays at low recoil journal, February 2013

B - and D -meson leptonic decay constants from four-flavor lattice QCD journal, October 2018

Study of the kinematic dependences of Λ b 0 production in pp collisions and a measurement of the Λ b 0 → Λ c + π − branching fraction journal, August 2014

Lattice QCD calculation of form factors describing the rare decays B → K * ℓ + ℓ − and B s → ϕ ℓ + ℓ − journal, May 2014

Differential branching fraction and angular analysis of Λb0 → Λμ+μ− decays journal, June 2015

Probing New Physics via the B s 0 → μ + μ − Effective Lifetime journal, July 2012

B →Vℓ+ℓ− in the Standard Model from light-cone sum rules journal, August 2016

Patterns of New Physics in b → sℓ+ℓ− transitions in the light of recent data journal, January 2018

Light-cone sum rules for B → K π form factors and applications to rare decays journal, December 2019

B-physics anomalies: a guide to combined explanations journal, November 2017

Exclusive rare B → K * ℓ + ℓ − decays at low recoil: Controlling the long-distance effects journal, December 2004

Model independent new physics analysis in $$\Lambda _b\rightarrow \Lambda \mu ^+\mu ^-$$ Λ b → Λ μ + μ - decay journal, March 2018

Using Λ b → Λ μ + μ − data within a Bayesian analysis of | Δ B | = | Δ S | = 1 decays journal, July 2016

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Measurement of the B s 0 → μ + μ − Branching Fraction and Effective Lifetime and Search for B 0 → μ + μ − Decays journal, May 2017

Angular moments of the decay Λ b 0 → Λμ+μ− at low hadronic recoil journal, September 2018

Λ b → Λ ℓ + ℓ − form factors, differential branching fraction, and angular observables from lattice QCD with relativistic b quarks journal, April 2016

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Angular distribution of polarised Λb baryons decaying to Λℓ+ℓ− journal, November 2017

Multichannel 1 → 2 transition amplitudes in a finite volume journal, February 2015

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Title: Bayesian analysis of $b \to s μ^{+} μ^{-}$ Wilson coefficients using the full angular distribution of $Λ_{b} \to Λ (\to p π^{-}) μ^{+} μ^{-}$ decays

Weak decays beyond leading logarithms
journal, October 1996

General analysis of $\bar{B} \to {\bar{K}}^{(*)} ℓ^{+} ℓ^{-}$ decays at low recoil
journal, February 2013

$B$ - and $D$ -meson leptonic decay constants from four-flavor lattice QCD
journal, October 2018

Study of the kinematic dependences of Λ b 0 production in pp collisions and a measurement of the Λ b 0 → Λ c + π − branching fraction
journal, August 2014

Lattice QCD calculation of form factors describing the rare decays $B \to K^{*} ℓ^{+} ℓ^{-}$ and $B_{s} \to ϕ ℓ^{+} ℓ^{-}$
journal, May 2014

Differential branching fraction and angular analysis of Λb0 → Λμ+μ− decays
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Probing New Physics via the $B_{s}^{0} \to μ^{+} μ^{-}$ Effective Lifetime
journal, July 2012

B →Vℓ+ℓ− in the Standard Model from light-cone sum rules
journal, August 2016

Patterns of New Physics in b → sℓ+ℓ− transitions in the light of recent data
journal, January 2018

Light-cone sum rules for B → K π form factors and applications to rare decays
journal, December 2019

B-physics anomalies: a guide to combined explanations
journal, November 2017

Exclusive rare $B \to K^{*} ℓ^{+} ℓ^{-}$ decays at low recoil: Controlling the long-distance effects
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Model independent new physics analysis in $$\Lambda _b\rightarrow \Lambda \mu ^+\mu ^-$$ Λ b → Λ μ + μ - decay
journal, March 2018

Using $Λ_{b} \to Λ μ^{+} μ^{-}$ data within a Bayesian analysis of $| Δ B | = | Δ S | = 1$ decays
journal, July 2016

Polarization and entanglement in baryon–antibaryon pair production in electron–positron annihilation
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journal, May 2017

Angular moments of the decay Λ b 0 → Λμ+μ− at low hadronic recoil
journal, September 2018

$Λ_{b} \to Λ ℓ^{+} ℓ^{-}$ form factors, differential branching fraction, and angular observables from lattice QCD with relativistic $b$ quarks
journal, April 2016

Study of the rare decays of B s 0 and B0 mesons into muon pairs using data collected during 2015 and 2016 with the ATLAS detector
journal, April 2019

B →P and B →V form factors from B-meson light-cone sum rules beyond leading twist
journal, January 2019

Angular distribution of polarised Λb baryons decaying to Λℓ+ℓ−
journal, November 2017

Multichannel $1 \to 2$ transition amplitudes in a finite volume
journal, February 2015

Theory of B→K (∗) l + l − decays at high q 2: OPE and quark–hadron duality
journal, May 2011

Angular analysis of the decay Λ b → Λ(→ Nπ)ℓ + ℓ −
journal, January 2015

Averages of b-hadron, c-hadron, and $$\tau $$ τ -lepton properties as of summer 2016
journal, December 2017