Test of lepton universality using $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays

Abstract

A measurement of the ratio of the branching fractions of the $B^{+}\to K^{+}{\mu }^{+}{\mu }^{-}$ and $B^{+}\to K^{+}{e}^{+}{e}^{-}$ decays is presented using proton-proton collision data, corresponding to an integrated luminosity of 3.0 fb${}^{-1}$, recorded with the LHCb experiment at center-of-mass energies of 7 and 8 $\mathrm{Te}\mathrm{V}$. The value of the ratio of branching fractions for the dilepton invariant mass squared range $1<q^2<6\mathrm{Ge}{\mathrm{V}}^2/c^4$ is measured to be $0.745_{-0.074}^{+0.090}(\mathrm{stat})\pm 0.036(\mathrm{syst})$. This value is the most precise measurement of the ratio of branching fractions to date and is compatible with the SM prediction within $2.6$ standard deviations.

arXiv comment10 pages, 2 figures

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• Revisiting Minimal Lepton Flavour Violation in the Light of Leptonic CP Violation
• Exhaustive Model Selection in $b\to s\ell \ell$ Decays: Pitting Cross-Validation against AIC${}_c$
• Bottom-quark Fusion Processes at the LHC for Probing $Z^{\prime }$ Models and B-meson Decay Anomalies
• On Light Resonance Interpretations of the B Decay Anomalies
• A testable radiative neutrino mass model without additional symmetries and Explanation for the $b\to s{\ell }^{+}{\ell }^{-}$ anomaly
• Exploring dark matter, neutrino mass and $R_{K^{(\ast )},\varphi }$ anomalies in $L_{\mu }-L_{\tau }$ model
• Flavor anomalies from asymptotically safe gravity
• Resolution of $R_D$/$R_{D^{\ast }}$ puzzle
• Searching for New Physics with $b\bar{b}{\ell }^{+}{\ell }^{-}$ Contact Interactions
• New physics in $b\to s{e}^{+}{e}^{-}$?
• Explanations for anomalies of muon anomalous magnetic dipole moment, $b\to s\mu \bar{\mu }$ and radiative neutrino masses in a leptoquark model
• Common explanation to the $R_{K^{(\ast )}}$, $R_{D^{(\ast )}}$ and ${\epsilon }^{\prime }/\epsilon$ anomalies in a 3HDM+${\nu }_R$ and connections to neutrino physics
• Revisiting the $B$-physics anomalies in $R$-parity violating MSSM
• Gauged Lepton Flavour
• Opportunities for lattice QCD in quark and lepton flavor physics
• Classification of anomaly-free 2HDMs with a gauged U(1)' symmetry
• From B-meson anomalies to Kaon physics with scalar leptoquarks
• Dispersive formalism for the nuclear structure correction ${\delta }_{\mathrm{NS}}$ to the $\beta$ decay rate
• Boosting vector leptoquark searches with boosted tops
• Rare b hadron decays at the LHC
• Scalar Leptoquarks, Baryon Number Violation and Pati-Salam Symmetry
• Anatomy of a six-parameter fit to the $b\to s{\ell }^{+}{\ell }^{-}$ anomalies
• Identifying a $Z^{\prime }$ behind $b\to s\ell \ell$ anomalies at the LHC
• On the Origin of Two-Loop Neutrino Mass from SU(5) Grand Unification
• Model-Independent Determination of $B_c^{+}\to {\eta }_c{\ell }^{+}\nu$ Form Factors
• Neutrino scattering and B anomalies from hidden sector portals
• Phenomenology of flavorful composite vector bosons in light of $B$ anomalies
• $R_K$ anomalies and simplified limits on $Z^{\prime }$ models at the LHC
• A model for the Singlet-Triplet Leptoquarks
• Constraints on $Z^{\prime }$ Boson within Minimal Flavor Violation
• Radiative corrections to semileptonic beta decays: Progress and challenges
• $B$ decay anomalies from nonabelian local horizontal symmetry
• Collider signature of $U_1$ Leptoquark and constraints from $b\to c$ observables
• Using a nested anomaly detection machine learning algorithm to study the neutral triple gauge couplings at an \texorpdfstring{$e^{+}{e}^{-}$}{e+e-} collider
• Collider phenomenology of a unified leptoquark model
• A Three-loop Neutrino Model with Leptoquark Triplet Scalars
• Leptoquark effects on $b\to s\nu \bar{\nu }$ and $B\to K{l}^{+}{l}^{-}$ decay processes
• Decays of charged $B$-mesons into three charged leptons and a neutrino
• Exploiting the Symmetries of P and S wave for B --> K^* mu^+ mu^-
• Flavor Physics and CP Violation
• Detecting anomalous quartic gauge couplings using the isolation forest machine learning algorithm
• Searching for New Heavy Neutral Gauge Bosons using Vector Boson Fusion Processes at the LHC
• Dark matter and $B$-meson anomalies in a flavor dependent gauge symmetry
• Recent $\mathbf{B}$ Physics Anomalies - a First Hint for Compositeness?
• A unified explanation of $b\to s{\mu }^{+}{\mu }^{-}$ anomalies, neutrino masses and $B\to \pi K$ puzzle
• Solving local anomaly equations in gauge-rank extensions of the Standard Model
• New Physics effects in charm meson decays involving $c\to u{l}^{+}{l}^{-}(l_i^{\mp }{l}_j^{\pm })$ transitions
• Lepton mass effects and angular observables in ${\Lambda }_b\to \Lambda (\to p\pi ){\ell }^{+}{\ell }^{-}$
• Exclusive semileptonic $B_s\to K\ell \nu$ decays on the lattice
• Gravitational Wave Signatures of Lepton Universality Violation
• A Three-loop Neutrino Mass Model with a Colored Triplet Scalar
• Muon $g-2$ in a $U(1)$-symmetric Two-Higgs-Doublet Model
• New flavor physics in di- and tri-lepton events from single-top at the LHC and beyond
• Non-Abelian family symmetries as portals to dark matter
• Measurement of the Absolute Branching Fraction of $D_s^{+}\to {\tau }^{+}{\nu }_{\tau }$ via ${\tau }^{+}\to e^{+}{\nu }_e{\bar{\nu }}_{\tau }$
• Direct determination of Wilson coefficients using $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decays
• Seeking leptoquarks in the $\mathbf{t}\bar{\mathbf{t}}$ plus missing energy channel at the high-luminosity LHC
• Loop suppressed light fermion masses with $U(1{)}_R$ gauge symmetry
• $R_{K^{(\ast )}}$ and $R(D^{(\ast )})$ anomalies resolved with lepton mixing
• New physics in $B\to K^{\ast }{\tau }^{+}{\tau }^{-}$: A model independent analysis
• Correlating Non-Resonant Di-Electron Searches at the LHC to the Cabibbo-Angle Anomaly and Lepton Flavour Universality Violation
• Non-minimal $331$ model for Lepton Flavour Universality Violation in $b\to s\ell \ell$ decays
• Anomalous triple gauge couplings from $B$-meson and kaon observables
• Measurements of the branching fractions for the semi-leptonic decays $D_s^{+}\to \varphi e^{+}{\nu }_e$, $\varphi {\mu }^{+}{\nu }_{\mu }$, $\eta {\mu }^{+}{\nu }_{\mu }$ and ${\eta }^{\prime }{\mu }^{+}{\nu }_{\mu }$
• The strange side of LHCb
• Equations of Motion for the Standard Model Effective Field Theory: Theory and Applications
• Phenomenology of ${\Xi }_b\to {\Xi }_c\tau \nu$ decays
• Right-handed Neutrino Dark Matter in a U(1) Extension of the Standard Model
• A model of spontaneous $CP$ breaking at low scale
• A Case Study of the Sensitivity to LFV Operators with Precision Measurements and the LHC
• Semileptonic and leptonic $B$ decays, circa 2016
• Search for $t{Z}^{\prime }$ associated production induced by $tc{Z}^{\prime }$ couplings at the LHC
• Impact of vector leptoquark on $\bar{B}\to {\bar{K}}^{\ast }{l}^{+}{l}^{-}$ anomalies
• $\mathcal{R}(D^{(\ast )})$ anomalies in light of Non-Minimal Universal Extra Dimension
• $CP$ violation in $b\to s\ell \ell$: a model independent analysis
• Discrete Glimpses of the Physics Landscape after the Higgs Discovery
• On the behaviour of composite resonances breaking lepton flavour universality
• Lepton-Flavor Violating Mediators
• Electroweak Corrections to the True Muonium Hyperfine Splitting
• Flavor anomalies at the LHC and the R-parity violating supersymmetric model extended with vectorlike particles
• Bs to mu mu gamma from Bs to mu mu
• Search for resonances in the mass spectrum of muon pairs produced in association with b quark jets in proton-proton collisions at $\sqrt{s}=$ 8 and 13 TeV
• Anomalies in B mesons decays: A phenomenological approach
• Assessing lepton-flavour non-universality from $B\to K^{\ast }\ell \ell$ angular analyses
• Explaining $b\to s{\ell }^{+}{\ell }^{-}$ data by sneutrinos in the $R$-parity violating MSSM
• Light dark matter, rare $B$ decays with missing energy in $L_{\mu }-L_{\tau }$ model with a scalar leptoquark
• Flavor Non-universal Vector Leptoquark Imprints in $K\to \pi \nu \bar{\nu }$ and $\Delta F=2$ Transitions
• Non-universal Z' from SO(10) GUTs with vector-like family and the origin of neutrino masses
• Search for the decay $B^0\to K^{\ast 0}{\tau }^{+}{\tau }^{-}$ at the Belle experiment
• Multi-lepton probes of new physics and lepton-universality in top-quark interactions
• Constraints on 2l2q operators from $\mu -e$ flavour-changing meson decays
• Studying ${\mathcal{B}}_1({\frac{1}{2}}^{+})\to {\mathcal{B}}_2({\frac{1}{2}}^{+}){\ell }^{+}{\ell }^{-}$ Semi-leptonic Weak Baryon Decays with the SU(3) Flavor Symmetry
• Study of the rare decays $B_{s,d}^{\ast }\to {\mu }^{+}{\mu }^{-}$
• Charged Higgs boson contribution to $B_q^{-}\to \ell \bar{\nu }$ and $\bar{B}\to (P,V)\ell \bar{\nu }$ in a generic two-Higgs doublet model
• ${\sin }^2{\theta }_W$ estimate and neutrino electromagnetic properties from low-energy solar data
• Status of Flavour Maximal Non-minimal Universal Extra Dimension
• Testing Leptoquark and $Z^{\prime }$ Models via $B\to K_1(1270,1400){\mu }^{+}{\mu }^{-}$ Decays
• Implications of the $R_K$ and $R_{K^{\ast }}$ anomalies
• Origin of Yukawa couplings for Higgs and leptoquarks
• Flavour anomalies on the eve of the Run-2 verdict
• Flavour anomalies: a review
• Phenomenology of TeV-scale scalar Leptoquarks in the EFT
• Scotogenic Dirac neutrino mass models embedded with leptoquarks: one pathway to address the flavor anomalies and the neutrino masses together
• $W$ mass in a model with vector-like leptons and $U(1{)}^{\prime }$
• Search for pair production of third-generation leptoquarks decaying into a bottom quark and a $\tau$-lepton with the ATLAS detector
• Observation of the decay $D^0\to K^{-}{\pi }^{+}{e}^{+}{e}^{-}$
• Implications of a Electroweak Triplet Scalar Leptoquark on the Ultra-High Energy Neutrino Events at IceCube
• Lepton-flavor universality limits in warped space
• Decay $B\to K^{\ast }(\to K\pi ){\ell }^{+}{\ell }^{-}$ in covariant quark model
• Optimized Lepton Universality Tests in $B\to V\ell \bar{\nu }$ decays
• Probing the $L_{\mu }-L_{\tau }$ gauge boson at electron colliders
• Constraints on Scalar Leptoquark from Kaon Sector
• Muon anomalies and the $SU(5)$ Yukawa relations
• Can Galileons solve the muon problem?
• On the decays $B\to K^{(\ast )}+$ leptonium
• B Anomalies and Leptoquarks at the LHC: Beyond the Lepton-Quark Final State
• Investigation of Dark Matter in the 3-2-3-1 Model
• Accidental scale-invariant Majorana dark matter in leptoquark-Higgs portals
• Study of semileptonic decays $B\to \pi l^{+}{l}^{-}$ and $B\to \rho l^{+}{l}^{-}$ in non-universal Z' model
• Measurement of the electron reconstruction efficiency at LHCb
• Probing new physics through $B_s^{\ast }\to {\mu }^{+}{\mu }^{-}$ decay
• Some results on Lepton Flavour Universality Violation
• Robust Limits from Upcoming Neutrino Telescopes and Implications on Minimal Dark Matter Models
• A Dark Sector for $g_{\mu }-2$, $R_K$ and a Diphoton Resonance
• Future Experimental Improvement for the Search of LNV Process in $e\mu$ Sector
• Predicting and Discovering True Muonium
• Implication of family non-universal $Z^{\prime }$ model to rare exclusive $b\to s(l\bar{l},\nu \bar{\nu })$ transitions
• Theoretical status of $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$: The path towards New Physics
• The LFU Ratio $R_{\pi }$ in the Standard Model and Beyond
• $B\to K_2^{\ast }(1430){\ell }^{+}{\ell }^{-}$ distributions in Standard Model at large recoil
• Lepton Flavor Violation in a $Z^{\prime }$ model for the $b\to s$ anomalies
• Studies of Lepton Flavor Violation at the LHC
• Diquark Explanation of $b\to s{\ell }^{+}{\ell }^{-}$
• Lepton flavour violation in rare ${\Lambda }_b$ decays
• Hadronic Vacuum Polarization in True Muonium
• Detailed Study of the Decay Lambda_b --> Lambda_c tau {\bar ν}_τ
• Bottom-quark Forward-Backward Asymmetry, Dark Matter and the LHC
• On the LHC signatures of $SU(5)\times U(1{)}^{\prime }$ F-theory motivated models
• Latest results on rare decays from LHCb
• Technicolor models with coupled systems of Schwinger-Dyson equations
• HEPLike: an open source framework for experimental likelihood evaluation
• Status of rare exclusive $B$ meson decays in 2018
• Study of ${\bar{B}}_s\to K^{(\ast )}{\ell }^{+}{\ell }^{-}$ decays in the PQCD factorization approach with the lattice QCD input
• Light stop in the MSSM after LHC Run 1
• Predictions of Angular Observables for ${\bar{B}}_s\to K^{\ast }\ell \ell$ and $\bar{B}\to \rho \ell \ell$ in Standard Model
• Explaining the $R_K$ and $R_{K^{\ast }}$ Anomalies With Right-handed Sneutrino
• Prospects for New Physics searches with ${\Lambda }_b\to \Lambda (1520){\ell }^{+}{\ell }^{-}$ decays
• muEDM: Towards a search for the muon electric dipole moment at PSI using the frozen-spin technique
• Collider Signatures of a Scalar Leptoquark and Vector-like Lepton in Light of Muon Anomaly
• Angular distribution of the FCNC process $B_c\to D_s^{\ast }(\to D_s\pi ){\ell }^{+}{\ell }^{-}$
• Effective field theory for vector-like leptons and its collider signals
• $b\to s{\mu }^{+}{\mu }^{-}$ anomalies and related phenomenology in $U(1{)}_{B_3-x_{\mu }{L}_{\mu }-x_{\tau }{L}_{\tau }}$ flavor gauge models
• Constraints on scalar and vector leptoquarks from the LHC Higgs data
• Effective Theory of Higgs Sector Vacuum States
• Constraints on Two Higgs Doublet Model Parameters in the light of rare $B$-Decays
• Non-resonant Leptoquark with multigeneration couplings to $\mu \mu jj$ and $\mu \nu jj$ at LHC
• High $p_T$ correlated tests of lepton universality in lepton(s) + jet(s) processes; an EFT analysis
• $b\to c\tau \bar{\nu }$ decays in supersymmetry with $R$-parity violation
• Search for the vectorlike leptons in the U(1)${}_X$ model inspired by the $B$-meson decay anomalies
• LHCb anomaly in $\mathbf{B}\to {\mathbf{K}}^{\ast }{\mathbf{\mu }}^{+}{\mathbf{\mu }}^{-}$ optimised observables and potential of ${\mathbf{Z}}^{\prime }$ Model
• Higgs-mass constraints on a supersymmetric solution of the muon g-2 anomaly
• Search for the lepton-flavor-violating decay $B^0\to K^{\ast 0}{\mu }^{\pm }{e}^{\mp }$
• Long-distance weak annihilation contribution to the $B^{\pm }\to ({\pi }^{\pm },K^{\pm }){\ell }^{+}{\ell }^{-}$ decays
• On the Impact of Soft Photons on $B\to K{\ell }^{+}{\ell }^{-}$
• Discovering True Muonium in $K_L\to ({\mu }^{+}{\mu }^{-})\gamma$
• Study of the rare decays $B_{(}s,d{)}^{\ast }$ arrow $l^{+}{l}^{-}$ in Z' model
• Light quark decays of doubly heavy baryons in light front approach
• Test of lepton flavour universality with $B_s^0\to \varphi {\ell }^{+}{\ell }^{-}$ decays
• Towards establishing Lepton Flavour Universality violation in $\bar{B}\to {\bar{K}}^{\ast }{\ell }^{+}{\ell }^{-}$ decays
• Leptoquarks in Flavour Physics
• Stashing the stops in multijet events at the LHC
• Lepton Flavor Violating Decays of $B$ and $K$ Mesons in Models with Extended Gauge Group
• Importance of vector leptoquark-scalar box diagrams in Pati-Salam unification with vector-like families
• Scouring meson decays for true muonium
• Hyperfine Splitting in True Muonium to $\mathcal{O}(m_{\mu }{\alpha }^6)$: Two Photon Annihilation Contribution from Other Flavors
• Lowering the scale of Pati-Salam breaking through seesaw mixing
• Analysis of ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ rare decays in a non-universal $Z^{\prime }$ model
• A low scale left-right symmetric mirror model
• Phenomenology of the SU(3)_C \otimes SU(2)_L \otimes SU(3)_R \otimes U(1)_X gauge model
• Flavor physics induced by light $Z^{\prime }$ from SO(10) GUT
• Perspectives and Outlook from HEP Window on the Universe
• The ${\Lambda }_b\to \Lambda (\to p{\pi }^{-}){\mu }^{+}{\mu }^{-}$ decay in the aligned two-Higgs-doublet model
• A Challenge to Lepton Universality in B Meson Decays
• Correlating $B_q^0\to {\mu }^{+}{\mu }^{-}$ and $K_L\to {\pi }^0\nu \bar{\nu }$ Decays with Four Generations
• A Flavorful Composite Higgs Model : Connecting the B anomalies with the hierarchy problem
• Flavour Anomalies in $b\to s{\ell }^{+}{\ell }^{-}$ Processes - a round table Discussion
• Dark matter, $Z^{\prime }$, vector-like quark at the LHC and $b\to s\mu \mu$ anomaly
• Towards a discovery of BSM physics from the Cabibbo angle anomaly
• New Physics in $b\to s\ell \ell$ anomalies and its implications for the complementary neutral current decays
• Dark matter and Collider signals in supersymmetric $U(1{)}^{\prime }$ models with non-universal $Z^{\prime }$ couplings
• Unification of the Standard Model and Dark Matter Sectors in [SU(5)$\times$U(1)]${}^4$
• Signatures of a Flavor Changing $Z^{\prime }$ Boson in $B_q\to \gamma Z^{\prime }$
• Decadal Mission for the New Physics Higgs/Flavor Era
• Rare nonleptonic ${\bar{B}}_s^0$ decays as probes of new physics behind $b\to s\mu \bar{\mu }$ anomalies
• New physics in $\text{b}\to \text{s}$ transitions in the MF331 model
• Rare B-Meson Decays at the Crossroads
• Probing New Physics in light of recent developments in $b\to c\ell \nu$ transitions
• Form factors for semi-leptonic $B$ decays
• Linking the $R_{K^{(\ast )}}$ anomalies to the Hubble tension via a single right-handed neutrino
• A detailed study of the ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ decays in the Standard Model
• Unraveling the couplings of a Drell-Yan produced $Z^{\prime }$ with heavy-flavor tagging
• Muon $g-2$ and semileptonic $B$ decays in Bélanger-Delaunay-Westhoff model with gauge kinetic mixing
• $B_s$-${\bar{B}}_s$ mixing interplay with $B$ anomalies
• Explaining $g_{\mu }-2$ and $R_{K^{(\ast )}}$ using the light mediators of $U(1{)}_{T3R}$
• The b --> s l^+ l^- anomalies and their implications for new physics
• Rare ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ decay in the two-Higgs doublet model of type-III
• Simplified models of vector $SU(4)$ leptoquarks at the TeV
• Neutrinophilic DM annihilation in a model with $U(1{)}_{L_{\mu }-L_{\tau }}\times U(1{)}_H$ gauge symmetry
• Exploring New Physics in transition $b\to s{\ell }^{+}{\ell }^{-}$ through different $B_c\to D_s^{(\ast )}{\ell }^{+}{\ell }^{-}$ observables
• $R_{K^{(\ast )}}$ from RPV-SUSY sneutrinos
• Isospin extrapolation as a method to study inclusive $\bar{B}\to X_s{\ell }^{+}{\ell }^{-}$ decays
• On the model dependence of measured Bs-meson branching fractions
• Determination of mass hierarchy with ${\nu }_{\mu }\to {\nu }_{\tau }$ appearance and the effect of nonstandard interactions
• Resurgence of $Z^{\prime }$ from the single electron-muon event at ATLAS
• Gluino Meets Flavored Naturalness
• Rare radiative leptonic B-decays
• Theoretical Prospects for B Physics
• Investigation of rare semileptonic $B_c$ decays into $(D_{(}s,d{)}^{(}(\ast ))){\mu }^{+}{\mu }^{-}$ decays with non-universal $Z^{\prime }$ effect
• Impact of lepton flavour universality violation on CP violation sensitivity of long baseline neutrino oscillation experiments
• Towards an amplitude analysis of the decay ${\Lambda }_b^0\to p{K}^{-}\gamma$
• The ${\Lambda }_b\to \Lambda (\to p{\pi }^{-}){\mu }^{+}{\mu }^{-}$ decay in the ${\text{RS}}_c$ model
• Angular analysis of the rare decay $B_s^0\to \varphi {\mu }^{+}{\mu }^{-}$
• Lepton nonuniversality anomalies and implications
• Clifford-based spectral action and renormalization group analysis of the gauge couplings
• $L_{\mu }-L_{\tau }$ effects to quarks and leptons from flavor unification
• Model independent investigation of rare semileptonic b \to u l \barν_l decay processes
• Angular distribution as an effective probe of new physics in semi-hadronic three-body meson decays
• Analysis of Angular Observables of ${\Lambda }_b\to \Lambda (\to p\pi ){\mu }^{+}{\mu }^{-}$ Decay in Standard and $Z^{\prime }$ Models
• Singlet vector leptoquark model facing recent LHCb and BABAR measurements
• A meta-analysis of distance measurements to M87
• The Neutrino Magnetic Moment Portal
• Interpreting B-anomalies within an extended 331 gauge theory
• Search for opposite sign muon-tau pair and a b-jet at LHC in the context of flavor anomalies
• A multi-charged particle model with local $U(1{)}_{\mu -\tau }$ to explain muon $g-2$, flavor physics, and possible collider signature
• High Resolution Nonperturbative Light-Front Simulations of the True Muonium Atom
• Scalar dark matter, Neutrino mass and Leptogenesis in a $\mathrm{U}(1{)}_{\mathrm{B}-\mathrm{L}}$ model
• Searching for New Physics in Semi-Leptonic Baryon Decays
• Rare decays of b hadrons
• Quark and Lepton Mass and Mixing with non-universal $Z^{\prime }$ from a 5d Standard Model with gauged $SO(3)$
• Precision measurement of the Z boson to electron neutrino coupling at the future circular colliders
• Applying Bayesian Inference to Galileon Solutions of the Muon Problem
• Status after the first LHC run: Looking for new directions in the physics landscape
• Exploring the role of new physics in $b\to u\tau \bar{\nu }$ decays
• Lepton universality violation from neutral pion decays in $R_{K^{(\ast )}}$ measurements
• Assessing Lepton Flavor Universality Violations in Semileptonic Decays
• B meson decay anomaly with a non-universal U(1)' extension
• Whitepaper submitted to Snowmass21: Advanced accelerator linear collider demonstration facility at intermediate energy
• Family Non-Universal U(1)${}^{\prime }$ Model with Minimal Number of Exotics
• Three Lectures of Flavor and CP violation within and Beyond the Standard Model
• $E_6$ Models in Light of Precision $M_W$ Measurements
• Neutrino mass in flavor dependent gauged lepton model
• Challenges for New Physics in the Flavour Sector
• Discriminating 1D new physics solutions in $b\to s\ell \ell$ decays
• New physics in $b\to s{e}^{+}{e}^{-}$: A model independent analysis
• Test of lepton flavour universality with $B^{+}\to K^{+}{\pi }^{+}{\pi }^{-}{\ell }^{+}{\ell }^{-}$ decays
• Scrutinizing $B^0$-meson flavor changing neutral current decay into scalar $K_0^{\ast }(1430)$ meson with $b\to s{\ell }^{+}{\ell }^{-}(\nu \bar{\nu })$ transition
• TeV-scale vector leptoquark from Pati-Salam unification with vectorlike families
• Experimental summary of the $52^{\mathrm{nd}}$ Rencontres de Moriond session on Electroweak Interactions and Unified Theories
• Study of $B_s^0\to l^{+}{l}^{-}\gamma$ decays in the nonuniversal Z' model
• ${\Lambda }_b\to \Lambda (\to p{\pi }^{-}){\ell }^{+}{\ell }^{-}$ as probe of CP-violating New Physics
• Implications of new physics in $B\to K_1{\mu }^{+}{\mu }^{-}$ decay processes
• Signs for new physics in the recent LHCb data?
• Towards constraining triple gluon operators through tops
• Reappraisal of the minimal flavoured $Z^{\prime }$ scenario
• Theory status and implications of $R_K^{(\ast )}$
• Decay $B_c^{+}\to D_{(s)}^{(\ast )+}{\ell }^{+}{\ell }^{-}$ within covariant confined quark model
• Explaining the LHC flavour anomalies
• Testing spin-2 mediator by angular observables in $b\to s{\mu }^{+}{\mu }^{-}$
• Perturbative unitarity constraints on generic Yukawa interactions
• CP violation and CKM studies (and first LHCb Run II results)
• The Beautiful Physics of LHC Run 2
• Theoretical Review of Rare B Decays
• Impact of Lattice QCD on CKM Phenomenology
• Prospects for $B_c^{+}\to {\tau }^{+}{\nu }_{\tau }$ at FCC-ee
• $\ge 4\mu$ signal from a vector-like lepton decaying to a muon-philic $Z^{\prime }$ boson at the LHC
• Heavy quark expansion of ${\Lambda }_b\to {\Lambda }^{\ast }(1520)$ form factors beyond leading order
• Epsilon_K in the Standard Model and the kaon phase conventions
• Rare b-hadron decays as probe of new physics
• Single Leptoquark Solutions to the $B$-physics Anomalies
• Universal lepton universality violation in exclusive processes
• Semileptonic neutral current decays of ${\Xi }_b$ with dileptons or dineutrinos in the final state
• Constraints on new physics from decays of polarized ${\Lambda }_b^0$ baryons at the FCC-ee
• Is there really a $W\to \tau \nu$ puzzle?
• Future Colliders Symposium in Hong Kong: Scientific Overview
• Nonperturbative True Muonium on the Light Front with TMSWIFT
• Prospects for rare B decays at Belle II
• Precision Measurement of the Branching Fraction of $D^{+}\to {\mu }^{+}{\nu }_{\mu }$
• A Short Guide to Flavour Physics and CP Violation
• Summary of the CKM 2016 working group on rare decays
• Fermiophobic $Z^{\prime }$ model for simultaneously explaining the muon anomalies $R_{K^{(\ast )}}$ and $(g-2{)}_{\mu }$
• Probing new physics effects in ${\Lambda }_b\to \Lambda (\to p{\pi }^{-}){\ell }^{+}{\ell }^{-}$ decay via model independent approach
• Introduction to Heavy Flavours
• CKM studies from b physics at hadron machines
• Enhancing $B_s\to e^{+}{e}^{-}$ to an Observable Level in the Two-Higgs-Doublet Model
• Blois 2019: highlights and outlook
• Tensions in the flavour sector
• New Physics in $B$ decays
• Single-top production and rare top interactions
• Form factors and differential distributions in rare radiative leptonic B-decays
• Vacuum stability in an extended standard model with a leptoquark
• $B_s^{\ast }\to l^{+}{l}^{-}$ decays in light of recent $B$ anomalies
• Flavor Anomalies and Quark-Lepton Unification
• Addressing $R_K$ and neutrino mixing in a class of $U(1{)}_X$ models
• Flavour Physics at LHCb -- 50 years of the KM paradigm
• Leptoquarks in B-meson anomalies: simplified models and HL-LHC discovery prospects
• Search for the semileptonic decays ${\Xi }_c^0\to {\Xi }^0{\ell }^{+}{\ell }^{-}$ at Belle
• Rare decays at LHCb
• Theoretical implications of recent heavy flavour measurements at the LHC
• Non-parametric and continuous extraction of amplitudes in electroweak penguin decays
• A model to accommodate the $B$-physics anomalies
• Non-universal electroweak extensions of the standard model and the scotogenic models
• Summary of the CKM 2014 working group on rare decays
• Selection of LHCb results from Run I
• BEACH 2014 Theory Summary
• Proton Decay and the Quantum Structure of Spacetime
• Anomalous measurements: recent results deepen flavour puzzle
• $B$ anomalies: From warped models to colliders
• Rare B, D and K decays, radiative and electroweak penguin decays, including constraints on $V_{td}/V_{ts}$ and ${\epsilon }^{\prime }/\epsilon$: Summary of CKM 2018 working group 3
• $B$ decay anomalies and dark matter from strong dynamics
• Rare FCNC top, beauty and charm decays
• The phenomenological cornucopia of SU(3) exotica
• Implications of lepton nonuniversality in the beauty sector
• Diagnosing New Physics with LUV and LFV B Decays
• Searches for LFV with CMS: leptoquarks with couplings to quarks of the 3rd generation
• Anomalies in the heavy sector