New light mediators for the R K and R K * puzzles

Datta, Alakabha; Kumar, Jacky; Liao, Jiajun; Marfatia, Danny

doi:10.1103/PhysRevD.97.115038

Title: New light mediators for the $R_{K}$ and $R_{K^{*}}$ puzzles

Abstract

The measurements of R_K and R_K* provide hints for the violation of lepton universality. However, it is generally difficult to explain the R_K* measurement in the low q² range, 0.045 ≤ q² ≤ 1.1 GeV² . Light mediators offer a solution by making the Wilson coefficients q² dependent. We check if new lepton nonuniversal interactions mediated by a scalar ( S ) or vector particle (Z') of mass between 10–200 MeV can reproduce the data. We find that a 25 MeV Z' with a q² -dependent b - s coupling and that couples to the electron but not the muon can explain all three anomalies in conjunction with other measurements. A similar 25 MeV S provides a good fit to all relevant data except R_K* in the low q² bin. A 25 MeV Z' with a q²-dependent b - s coupling and that couples to the muon but not the electron provides a good fit to the combination of the R_K and R_K*data, but does not fit R_K* in the low q² bin well.

Authors:: Datta, Alakabha; Kumar, Jacky; Liao, Jiajun; Marfatia, Danny

Publication Date:: Thu Jun 21 00:00:00 EDT 2018

Research Org.:: Univ. of Hawaii, Honolulu, HI (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1456268

Alternate Identifier(s):: OSTI ID: 1498837

Grant/Contract Number:: SC0010504

Resource Type:: Published Article

Journal Name:: Physical Review. D.

Additional Journal Information:: Journal Name: Physical Review. D. Journal Volume: 97 Journal Issue: 11; Journal ID: ISSN 2470-0010

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats


                    Datta, Alakabha, Kumar, Jacky, Liao, Jiajun, and Marfatia, Danny. New light mediators for the R K and R K * puzzles.  United States: N. p., 2018. 
Web.  doi:10.1103/PhysRevD.97.115038.

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                    Datta, Alakabha, Kumar, Jacky, Liao, Jiajun, & Marfatia, Danny. New light mediators for the R K and R K * puzzles.  United States.  https://doi.org/10.1103/PhysRevD.97.115038

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                    Datta, Alakabha, Kumar, Jacky, Liao, Jiajun, and Marfatia, Danny. Thu .  
"New light mediators for the R K and R K * puzzles".  United States.  https://doi.org/10.1103/PhysRevD.97.115038.

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@article{osti_1456268,

  title        = {New light mediators for the R K and R K * puzzles},

  author       = {Datta, Alakabha and Kumar, Jacky and Liao, Jiajun and Marfatia, Danny},

  abstractNote = {The measurements of RK and RK* provide hints for the violation of lepton universality. However, it is generally difficult to explain the RK* measurement in the low q2 range, 0.045 ≤ q2 ≤ 1.1 GeV2 . Light mediators offer a solution by making the Wilson coefficients q2 dependent. We check if new lepton nonuniversal interactions mediated by a scalar ( S ) or vector particle (Z') of mass between 10–200 MeV can reproduce the data. We find that a 25 MeV Z' with a q2 -dependent b - s coupling and that couples to the electron but not the muon can explain all three anomalies in conjunction with other measurements. A similar 25 MeV S provides a good fit to all relevant data except RK* in the low q2 bin. A 25 MeV Z' with a q2-dependent b - s coupling and that couples to the muon but not the electron provides a good fit to the combination of the RK and RK*data, but does not fit RK* in the low q2 bin well.},

  doi          = {10.1103/PhysRevD.97.115038},

  journal      = {Physical Review. D.},

  number       = 11,

  volume       = 97,

  place        = {United States},

  year         = {Thu Jun 21 00:00:00 EDT 2018},

  month        = {Thu Jun 21 00:00:00 EDT 2018}

}

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Cited by: 29 works

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Figures / Tables:

TABLE I: The fit results and the predictions for $R$_$K$ and $R$_$K$ at the best fit point for three scenarios of a light mediator with a mass of 25 MeV.

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Works referenced in this record:

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Title: New light mediators for the R K and R K * puzzles

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Interpreting hints for lepton flavor universality violation
journal, September 2017

Search for $B \to K^{(*)} ν \bar{ν}$ and invisible quarkonium decays
journal, June 2013

On the standard model predictions for $$R_K$$ R K and $$R_{K^*}$$ R K ∗
journal, August 2016

New Determination of the Fine Structure Constant and Test of the Quantum Electrodynamics
journal, February 2011

Towards the discovery of new physics with lepton-universality ratios of $b \to s ℓ ℓ$ decays
journal, November 2017

Direct $C P$ , Lepton Flavor, and Isospin Asymmetries in the Decays $B \to K^{(*)} l^{+} l^{-}$
journal, March 2009

Optimizing the basis of B → K * ℓ + ℓ − observables in the full kinematic range
journal, May 2013

Reassessing the discovery potential of the $B \to K^{*} ℓ^{+} ℓ^{-}$ decays in the large-recoil region: SM challenges and BSM opportunities
journal, January 2016

Search for $B \to h^{(*)} ν \bar{ν}$ with the full Belle $Υ (4 S)$ data sample
journal, June 2013

$R_{K}$ and $R_{K^{*}}$ beyond the standard model
journal, August 2017

Search for the dark photon in $π^{0}$ decays
journal, June 2015

Measurement of the $B \to X_{s} ℓ^{+} ℓ^{-}$ Branching Fraction and Search for Direct $C P$ Violation from a Sum of Exclusive Final States
journal, May 2014

Measurement of the Differential Branching Fraction and Forward-Backward Asymmetry for $B \to K^{(*)} l^{+} l^{-}$
journal, October 2009

Differential branching fraction and angular analysis of the decay $ B_s^0 $ → ϕμ + μ −
journal, July 2013

Large hadronic power corrections or new physics in the rare decay B → K ∗ μ + μ −?
journal, July 2017

$B_{d, s} \to ρ, ω, K^{*}, ϕ$ decay form factors from light-cone sum rules reexamined
journal, January 2005

A light Z ′ for the R K puzzle and nonstandard neutrino interactions
journal, May 2017

Angular analysis of the B 0 → K *0 μ + μ − decay using 3 fb−1 of integrated luminosity
journal, February 2016

Simultaneous explanation of the R K and R ( D (⁎) ) puzzles
journal, March 2015

Lepton-Flavor-Dependent Angular Analysis of $B \to K^{*} ℓ^{+} ℓ^{-}$
journal, March 2017

B → K∗ ℓ + ℓ − decays at large recoil in the Standard Model: a theoretical reappraisal
journal, June 2016

A leptoquark model to accommodate R K exp < R K SM and R K ∗ exp < R K ∗ S M $$ {R}_{K^{\ast}}^{\exp }<{R}_{K^{\ast}}^{\mathrm{SM}} $$
journal, August 2017

More model-independent analysis of $\vec{b} s$ processes
journal, April 2004

Flavour anomalies after the R K ∗ measurement
journal, September 2017

Simultaneous explanation of the R K and R D * $$ {R}_{D^{\left(*\right)}} $$ puzzles: a model analysis
journal, January 2017

Calculation of $B^{0} \to K^{* 0} μ^{+} μ^{-}$ and $B_{s}^{0} \to ϕ μ^{+} μ^{-}$ Observables Using Form Factors from Lattice QCD
journal, May 2014

New results on $B \to π, K, η$ decay form factors from light-cone sum rules
journal, January 2005

Rare B decays with a HyperCP particle of spin one
journal, January 2010

New physics in $b \to s μ^{+} μ^{-}$ after the measurement of $R_{K^{*}}$
journal, November 2017

$R_{K}$ and future $b \to s ℓ ℓ$ physics beyond the standard model opportunities
journal, September 2014

Angular analysis and differential branching fraction of the decay B s 0 → ϕμ + μ −
journal, September 2015

$B \to K l^{+} l^{-}$ decay form factors from three-flavor lattice QCD
journal, January 2016

Explaining the $$R_K$$ R K and $$R_{K^*}$$ R K ∗ anomalies
journal, October 2017

Measurement of the B 0 → K ∗0 e + e − branching fraction at low dilepton mass
journal, May 2013

Implications of the ${{\boldsymbol{R}}}_{K}$ and ${{\boldsymbol{R}}}_{{K}^{* }}$ anomalies
journal, January 2018