Flavor Anomalies and Quark-Lepton Unification

Abstract

We show that one can explain the neutral and charged anomalies in B-meson decays in the minimal theory for quark-lepton unification.The implications for flavor violating processes are discussed in detail. Strikingly, experimental observations suggest that the unification of quarks and leptons could be realized below the $\mathcal{O}(10^2)$ TeV scale.

arXiv comment26 pages, 5 figures. v2: new references have been added, the bound on the contribution from new physics to Δm_{B_s} has been reduced from 50% to 10%. PRD version

References in corpus (58)

• Final Report of the Muon E821 Anomalous Magnetic Moment Measurement at BNL
• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
• Test of lepton universality using $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• Evidence for an excess of B -> D(*) Tau Nu decays
• Test of lepton universality with $B^0\to K^{\ast 0}{\ell }^{+}{\ell }^{-}$ decays
• Measurement of an Excess of B -> D(*) Tau Nu Decays and Implications for Charged Higgs Bosons
• Measurement of the branching ratio of $\bar{B}\to D^{(\ast )}{\tau }^{-}{\bar{\nu }}_{\tau }$ relative to $\bar{B}\to D^{(\ast )}{\ell }^{-}{\bar{\nu }}_{\ell }$ decays with hadronic tagging at Belle
• Physics of leptoquarks in precision experiments and at particle colliders
• Searches for Lepton Flavor Violation in the Decays tau -> e gamma and tau -> mu gamma
• Measurement of the ratio of branching fractions $\mathcal{B}({\overline{B}}^0\to D^{\ast +}{\tau }^{-}{\overline{\nu }}_{\tau })/\mathcal{B}({\overline{B}}^0\to D^{\ast +}{\mu }^{-}{\overline{\nu }}_{\mu })$
• The Belle II Physics Book
• $B\to V{\ell }^{+}{\ell }^{-}$ in the Standard Model from Light-Cone Sum Rules
• B-physics anomalies: a guide to combined explanations
• Measurement of the $\tau$ lepton polarization and $R(D^{\ast })$ in the decay $\bar{B}\to D^{\ast }{\tau }^{-}{\bar{\nu }}_{\tau }$
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2018
• Search for lepton-universality violation in $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• Test of lepton universality in beauty-quark decays
• Testing leptoquark models in $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
• Measurement of the ratio of the $B^0\to D^{\ast -}{\tau }^{+}{\nu }_{\tau }$ and $B^0\to D^{\ast -}{\mu }^{+}{\nu }_{\mu }$ branching fractions using three-prong $\tau$-lepton decays
• A three-site gauge model for flavor hierarchies and flavor anomalies
• Test of Lepton Flavor Universality by the measurement of the $B^0\to D^{\ast -}{\tau }^{+}{\nu }_{\tau }$ branching fraction using three-prong $\tau$ decays
• Gauge leptoquark as the origin of B-physics anomalies
• Flavor models for $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$
• The lifetime of the $B_c^{-}$ meson and the anomalies in $B\to D^{(\ast )}\tau \nu$
• A model of vector leptoquarks in view of the $B$-physics anomalies
• Baryon Number and Lepton Universality Violation in Leptoquark and Diquark Models
• Measurement of the $\tau$ lepton polarization and $R(D^{\ast })$ in the decay $\bar{B}\to D^{\ast }{\tau }^{-}{\bar{\nu }}_{\tau }$ with one-prong hadronic $\tau$ decays at Belle
• Scalar contributions to $b\to c(u)\tau \nu$ transitions
• Reading the footprints of the B-meson flavor anomalies
• Rare $B$ Decays as Tests of the Standard Model
• $B\to K{l}^{+}{l}^{-}$ decay form factors from three-flavor lattice QCD
• Global fit to $b\to c\tau \nu$ transitions
• Revisiting the vector leptoquark explanation of the B-physics anomalies
• Lepton flavor non-universality in $b\to s{\ell }^{+}{\ell }^{-}$ processes
• The $B_c$ Meson Lifetime
• Measurement of the $B_s^0\to {\mu }^{+}{\mu }^{-}$ decay properties and search for the $B^0\to {\mu }^{+}{\mu }^{-}$ and $B_s^0\to {\mu }^{+}{\mu }^{-}\gamma$ decays
• Constraints on scalar leptoquarks from lepton and kaon physics
• Explaining the $R_K$ and $R_{K^{\ast }}$ anomalies
• Quark-Lepton Unification and Rare Meson Decays
• Tests of lepton universality using $B^0\to K_S^0{\ell }^{+}{\ell }^{-}$ and $B^{+}\to K^{\ast +}{\ell }^{+}{\ell }^{-}$ decays
• Search for pairs of scalar leptoquarks decaying into quarks and electrons or muons in $\sqrt{s}=13$ TeV pp collisions with the ATLAS detector
• Massive vectors and loop observables: the $g-2$ case
• Search for singly and pair-produced leptoquarks coupling to third-generation fermions in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• $R_2$ as a single leptoquark solution to $R_{D^{(\ast )}}$ and $R_{K^{(\ast )}}$
• A unified leptoquark model confronted with lepton non-universality in $B$-meson decays
• Search for leptoquarks coupled to third-generation quarks in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Low Scale Quark-Lepton Unification
• The role of right-handed neutrinos in $b\to c\tau \bar{\nu }$ anomalies
• Leptoquarks and Matter Unification: Flavor Anomalies and the Muon $g-2$
• Mass limits for scalar and gauge leptoquarks from $K_L^0\to e^{\mp }{\mu }^{\pm },B^0\to e^{\mp }{\tau }^{\pm }$ decays
• Unified SU(4) theory for the $R_{D^{(\ast )}}$ and $R_{K^{(\ast )}}$ anomalies
• Constraining Scalar Leptoquarks from the K and B Sectors
• Das ist der HAMMER: Consistent new physics interpretations of semileptonic decays
• Fermionic decays of scalar leptoquarks and scalar gluons in the minimal four color symmetry model
• Scalar Leptoquarks, Baryon Number Violation and Pati-Salam Symmetry
• Collider phenomenology of a unified leptoquark model
• Probing Quark-Lepton Unification with Leptoquark and Higgs Decays
• Chiral gauge leptoquark mass limits and branching ratios of $K_L^0,B^0,B_s\to l_i^{+}{l}_j^{-}$ decays with account of the general fermion mixing in leptoquark currents