Diagnosing lepton-nonuniversality in $b\to s\ell \ell$

Abstract

Ratios of branching fractions of semileptonic B decays, $(B\to H\mu \mu )$ over $(B\to Hee)$ with $H=K,K^{\ast },X_s,K_0(1430),\varphi ,\dots$ are sensitive probes of lepton universality. In the Standard Model, the underlying flavor changing neutral current process $b\to s\ell \ell$ is lepton flavor universal. However models with new flavor violating physics above the weak scale can give substantial non-universal contributions. The leading contributions from such new physics can be parametrized by effective dimension six operators involving left- or right-handed quarks. We show that in the double ratios $R_{X_s}/R_K$, $R_{K^{\ast }}/R_K$ and $R_{\varphi }/R_K$ the dependence on new physics coupling to left-handed quarks cancels out. Thus a measurement of any of these double ratios is a clean probe of flavor nonuniversal physics coupling to right-handed quarks. We also point out that the observables $R_{X_s}$, $R_{K^{\ast }}$, $R_{K_0(1430)}$ and $R_{\varphi }$ depend on the same combination of Wilson coefficients and therefore satisfy simple consistency relations.

arXiv comment20 pages, 4 plots; axialvector K1 included

References in corpus (27)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Big-Bang Nucleosynthesis
• Test of lepton universality using $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• Measurement of form-factor independent observables in the decay $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$
• B_{s,d} -> l+ l- in the Standard Model with Reduced Theoretical Uncertainty
• More Model-Independent Analysis of b->s Processes
• Measurement of the Differential Branching Fraction and Forward-Backword Asymmetry for B->K(*)l+l-
• Understanding the B->K*mu+mu- Anomaly
• Angular Distributions of B -> K ll Decays
• $SU(2)\times U(1)$ gauge invariance and the shape of new physics in rare $B$ decays
• Lattice QCD calculation of form factors describing the rare decays $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$ and $B_s\to \varphi {\ell }^{+}{\ell }^{-}$
• Electromagnetic Logarithms in B -> X_s l+ l-
• Measurement of Branching Fractions and Rate Asymmetries in the Rare Decays B -> K(*) l+ l-
• Comprehensive Bayesian Analysis of Rare (Semi)leptonic and Radiative B Decays
• Hint of Lepton Flavour Non-Universality in $B$ Meson Decays
• CP Asymmetries in bar B -> bar K* (-> bar K pi) l+ l- and Untagged bar B_s,B_s -> phi (-> K+ K-) l+ l- Decays at NLO
• Calculation of $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ and $B_s^0\to \varphi {\mu }^{+}{\mu }^{-}$ observables using form factors from lattice QCD
• General Analysis of B -> K^(*) l^+ l^- Decays at Low Recoil
• Global fits to b -> s ll data and signs for lepton non-universality
• Measurement of the B->Xsl+l- branching fraction and search for direct CP violation from a sum of exclusive final states
• Resonances gone topsy turvy - the charm of QCD or new physics in $b\to s{\ell }^{+}{\ell }^{-}$?
• Explaining the Lepton Non-universality at the LHCb and CMS from a Unified Framework
• Impact of $B\to K_0^{\ast }{\ell }^{+}{\ell }^{-}$ on the New Physics search in $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$ decay
• B -> K^* Form Factors from Flavor Data to QCD and Back
• The effect of S-wave interference on the $B^0\to K^{\ast 0}{\ell }^{+}{\ell }^{-}$ angular observables
• (A)symmetries of weak decays at and near the kinematic endpoint
• Form factors from lattice QCD

Cited by in corpus (95)

• Test of lepton universality with $B^0\to K^{\ast 0}{\ell }^{+}{\ell }^{-}$ decays
• Physics of leptoquarks in precision experiments and at particle colliders
• On the Standard Model predictions for $R_K$ and $R_{K^{\ast }}$
• Global analysis of $b\to s\ell \ell$ anomalies
• Patterns of New Physics in $b\to s{\ell }^{+}{\ell }^{-}$ transitions in the light of recent data
• Flavour anomalies after the $R_{K^{\ast }}$ measurement
• Simultaneous Explanation of the $R_K$ and $R(D^{(\ast )})$ Puzzles
• Interpreting Hints for Lepton Flavor Universality Violation
• Leptoquark model to explain the $B$-physics anomalies, $R_K$ and $R_D$
• High-$p_T$ dilepton tails and flavour physics
• Review of Lepton Universality tests in B decays
• $R_K$ and $R_{K^{\ast }}$ beyond the Standard Model
• Family non-universal Z' models with protected flavor-changing interactions
• Lepton Flavor Non-Universality in B-meson Decays from a U(2) Flavor Model
• On the anomalies in the latest LHCb data
• Reassessing the discovery potential of the $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$ decays in the large-recoil region: SM challenges and BSM opportunities
• $R_{D^{(\ast )}}$ anomaly: A possible hint for natural supersymmetry with $R$-parity violation
• Test of lepton-flavor universality in $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$ decays at Belle
• Leptoquark Flavor Patterns & B Decay Anomalies
• $\Delta M_s$ theory precision confronts flavour anomalies
• Status of the $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$ anomaly after Moriond 2017
• Reconsidering the One Leptoquark solution: flavor anomalies and neutrino mass
• Phenomenology of an $SU(2)\times SU(2)\times U(1)$ model with lepton-flavour non-universality
• Rare $B$ Decays as Tests of the Standard Model
• Lepton Flavor Violation in Exclusive $b\to s$ Decays
• New Physics in $b\to s{\ell }^{+}{\ell }^{-}$ confronts new data on Lepton Universality
• Predictions for Lepton Flavor Universality Violation in Rare B Decays in Models with Gauged $L_{\mu }-L_{\tau }$
• Gauge-invariant implications of the LHCb measurements on Lepton-Flavour Non-Universality
• Lepton flavor non-universality in $b\to s{\ell }^{+}{\ell }^{-}$ processes
• A leptoquark model to accommodate $R_K^{\exp }<R_K^{\mathrm{SM}}$ and $R_{K^{\ast }}^{\exp }<R_{K^{\ast }}^{\mathrm{SM}}$
• Phenomenology of semileptonic B-meson decays with form factors from lattice QCD
• With or without U(2)? Probing non-standard flavor and helicity structures in semileptonic B decays
• The Leptoquark Hunter's Guide: Large Coupling
• Lessons from the $B^{0,+}\to K^{\ast 0,+}{\mu }^{+}{\mu }^{-}$ angular analyses
• Flavorful leptoquarks at hadron colliders
• Implications for New Physics in $b\to s\mu \mu$ transitions after recent measurements by Belle and LHCb
• Implications of $b\to s$ measurements
• $R_2$ as a single leptoquark solution to $R_{D^{(\ast )}}$ and $R_{K^{(\ast )}}$
• Large hadronic power corrections or new physics in the rare decay B-->K* mu+ mu- ?
• Test of lepton universality with ${\Lambda }_b^0\to p{K}^{-}{\ell }^{+}{\ell }^{-}$ decays
• A common origin of $R_K$ and neutrino masses
• Low-energy Effects of Lepton Flavour Universality Violation
• Footprints of leptoquarks: from $R_{K^{(\ast )}}$ to $K\to \pi \nu \bar{\nu }$
• Measuring the Breaking of Lepton Flavour Universality in $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$
• SU(5) Unification with TeV-scale Leptoquarks
• Leptoquark patterns unifying neutrino masses, flavor anomalies, and the diphoton excess
• Unified SU(4) theory for the $R_{D^{(\ast )}}$ and $R_{K^{(\ast )}}$ anomalies
• Dirac dark matter and $b\to s{\ell }^{+}{\ell }^{-}$ with $\mathrm{U}(1)$ gauge symmetry
• $R_K$ and $R_{K^{\ast }}$ in an Aligned 2HDM with Right-Handed Neutrinos
• Charged-Lepton Mixing and Lepton Flavor Violation
• Stringy explanation of $b\to s{\ell }^{+}{\ell }^{-}$ anomalies
• New Physics in Rare B Decays after Moriond 2021
• More Lepton Flavor Violating Observables for LHCb's Run 2
• Classification of anomaly-free 2HDMs with a gauged U(1)' symmetry
• Rare b hadron decays at the LHC
• $B_s^0\to {\ell }^{+}{\ell }^{-}\gamma$ as a Test of Lepton Flavor Universality
• A gauged horizontal $SU(2)$ symmetry and $R_{K^{(\ast )}}$
• Contributions to $b\to s\ell \ell$ Anomalies from $R$-Parity Violating Interactions
• Flavor Physics and CP Violation
• Recent $\mathbf{B}$ Physics Anomalies - a First Hint for Compositeness?
• $B$ anomalies under the lens of electroweak precision
• Non-minimal $331$ model for Lepton Flavour Universality Violation in $b\to s\ell \ell$ decays
• $R_{D^{(\ast )}}$ in custodial warped space
• Flavorful leptoquarks at the LHC and beyond: Spin 1
• Anomalies in B mesons decays: A phenomenological approach
• Assessing lepton-flavour non-universality from $B\to K^{\ast }\ell \ell$ angular analyses
• Status of Flavour Maximal Non-minimal Universal Extra Dimension
• Flavour issues in warped custodial models: $B$ anomalies and rare $K$ decays
• Testing Leptoquark and $Z^{\prime }$ Models via $B\to K_1(1270,1400){\mu }^{+}{\mu }^{-}$ Decays
• Constraining rare B decays by ${\mu }^{+}{\mu }^{-}\to tc$ at future lepton colliders
• Implications of the $R_K$ and $R_{K^{\ast }}$ anomalies
• Flavour anomalies on the eve of the Run-2 verdict
• Rank-One Flavor Violation and B-meson anomalies
• Consequences of $b\to s{\mu }^{+}{\mu }^{-}$ anomalies on $B\to K^{(\ast )}\nu \bar{\nu }$, $B_s\to (\eta ,{\eta }^{\prime })\nu \bar{\nu }$ and $B_s\to \varphi \nu \bar{\nu }$ decay observables
• Some results on Lepton Flavour Universality Violation
• Predictions for $B_s\to {\bar{K}}^{\ast }\ell \ell$ in non-universal $Z^{\prime }$ models
• Direct Constraints, Flavor Physics, and Flavor Anomalies in Composite Higgs Models
• Explaining the $R_K$ and $R_{K^{\ast }}$ Anomalies With Right-handed Sneutrino
• Long-distance weak annihilation contribution to the $B^{\pm }\to ({\pi }^{\pm },K^{\pm }){\ell }^{+}{\ell }^{-}$ decays
• New Perspectives for Testing Electron-Muon Universality
• New physics in $\text{b}\to \text{s}$ transitions in the MF331 model
• Theoretical Prospects for B Physics
• Lepton nonuniversality anomalies and implications
• Relations between $b\to c\tau \nu$ Decay Modes in Scalar Models
• Rare decays of b hadrons
• Frugal $U(1{)}_X$ models with non-minimal flavor violation for $b\to s\ell \ell$ anomalies and neutrino mixing
• A Short Guide to Flavour Physics and CP Violation
• Rare b-hadron decays as probe of new physics
• B-Anomalies from flavorful U(1)' extensions, safely
• Flavour Physics from Present to Future Colliders
• Non-universal Z' models with protected flavour-changing interactions
• Polarized and un-polarized ${\mathcal{R}}_{K^{\ast }}$ in and beyond the SM
• QCD and High Energy Interactions: Moriond 2018 Theory Summary
• Summary of the CKM 2014 working group on rare decays
• Theoretical implications of recent heavy flavour measurements at the LHC