Diquark Explanation of $b\to s{\ell }^{+}{\ell }^{-}$

Abstract

The discrepancies between $b\to s{\ell }^{+}{\ell }^{-}$ data and the corresponding Standard Model predictions point to the existence of new physics with a significance at the $5\sigma$ level. While previously a lepton flavour universality violating effect was preferred, the new $R(K^{(\ast )})$ and $B_s\to {\mu }^{+}{\mu }^{-}$ measurements are now compatible with the Standard Model, favouring a lepton flavour universal beyond the Standard Model contribution to $C_9$. Since heavy new physics is generally chiral, and because of the stringent constraints from charged lepton flavour violation, this poses a challenge for model building. In this article, we point out a novel possibility: a diquark, i.e. a coloured scalar, induces the Wilson coefficient of the $(\bar{s}{\gamma }^{\mu }{P}_{L}b)(\bar{c}{\gamma }_{\mu }{P}_{L}c)$ operator at tree-level, which then mixes into $O_9$ via an off-shell photon penguin. This setup allows for a lepton flavour universal effect of $C_9\approx -0.5$, without violating bounds from $\Delta M_s$, $\Delta \Gamma$, $B\to X_s\gamma$ and $D^0-{\bar{D}}^0$ mixing. This scenario predicts a small and negative $C_9^{\prime }$ and a light diquark, preferably with a mass around $500$GeV, as compatible with the CMS di-di-jet analysis, and a deficit in the inclusive $b\to c\bar{c}s$ rate.

arXiv comment12 pages, 1 figure. v2: Journal version - added references, fixed typos, moved some large equations to appendix

References in corpus (120)

• The BABAR Detector
• CP Violation and the CKM Matrix: Assessing the Impact of the Asymmetric B Factories
• R-parity violating supersymmetry
• Test of lepton universality using $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• Test of lepton universality with $B^0\to K^{\ast 0}{\ell }^{+}{\ell }^{-}$ decays
• FLAG Review 2021
• B_{d,s}->rho, omega, K*, phi Decay Form Factors from Light-Cone Sum Rules Revisited
• $B\to V{\ell }^{+}{\ell }^{-}$ in the Standard Model from Light-Cone Sum Rules
• Angular analysis of the $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decay using $3\,\mbox{fb}^{-1}$ of integrated luminosity
• Charm-loop effect in $B\to K^{(\ast )}{\ell }^{+}{\ell }^{-}$ and $B\to K^{\ast }\gamma$
• Understanding the B->K*mu+mu- Anomaly
• Test of lepton universality in beauty-quark decays
• Differential branching fractions and isospin asymmetries of $B\to K^{(\ast )}{\mu }^{+}{\mu }^{-}$ decays
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• Flavour anomalies after the $R_{K^{\ast }}$ measurement
• Angular analysis and differential branching fraction of the decay $B_s^0\to \varphi {\mu }^{+}{\mu }^{-}$
• $R_K$ and future $b\to s\ell \ell$ BSM opportunities
• Effective description of general extensions of the Standard Model: the complete tree-level dictionary
• Optimizing the basis of B->K*ll observables in the full kinematic range
• Measurement of $CP$-averaged observables in the $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decay
• Implications from clean observables for the binned analysis of B -> K*ll at large recoil
• Lattice QCD calculation of form factors describing the rare decays $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$ and $B_s\to \varphi {\ell }^{+}{\ell }^{-}$
• Importance of Loop Effects in Explaining the Accumulated Evidence for New Physics in B Decays with a Vector Leptoquark
• Emerging patterns of New Physics with and without Lepton Flavour Universal contributions
• $B\to P$ and $B\to V$ Form Factors from $B$-Meson Light-Cone Sum Rules beyond Leading Twist
• Study of the rare decays of $B_s^0$ and $B^0$ mesons into muon pairs using data collected during 2015 and 2016 with the ATLAS detector
• Complete Anatomy of B -> K*ll and its angular distribution
• $B_{(s)}^0$-mixing matrix elements from lattice QCD for the Standard Model and beyond
• $B\to K{\ell }^{+}{\ell }^{-}$ decay at large hadronic recoil
• Angular analysis of $B_d^0\to K^{\ast }{\mu }^{+}{\mu }^{-}$ decays in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• SU(3) Breaking and D0-D0bar Mixing
• B-meson decay constants from improved lattice NRQCD and physical u, d, s and c sea quarks
• Measurement of angular parameters from the decay ${\mathrm{B}}^0\to {\mathrm{K}}^{\ast 0}{\mu }^{+}{\mu }^{-}$ in proton-proton collisions at $\sqrt{s}=$ 8 TeV
• Angular analysis of the decay B0 to K*0 mu mu from pp collisions at sqrt(s) = 8 TeV
• Left-handed Z' and Z FCNC quark couplings facing new b -> s mu^+ mu^- data
• Branching fraction measurements of the rare $B_s^0\to \varphi {\mu }^{+}{\mu }^{-}$ and $B_s^0\to f_2^{\prime }(1525){\mu }^{+}{\mu }^{-}$ decays
• Long-distance effects in $B\to K^{\ast }\ell \ell$ from Analyticity
• A Global Likelihood for Precision Constraints and Flavour Anomalies
• Neutral B-meson mixing from full lattice QCD at the physical point
• The $D^0-{\bar{D}}^0$ mass difference from a dispersion relation
• Explorations of the Top Quark Forward-Backward Asymmetry at the Tevatron
• On minimal Z' explanations of the B->K*mu+mu- anomaly
• Towards B -> X_s gamma at the NNLO in QCD without interpolation in m_c
• Improved Theory Predictions and Global Analysis of Exclusive $\mathbf{b}\to \mathbf{s}{\mathbf{\mu }}^{+}{\mathbf{\mu }}^{-}$ Processes
• Light colored scalars from grand unification and the forward-backward asymmetry in top quark pair production
• Test of lepton universality in $b\to s{\ell }^{+}{\ell }^{-}$ decays
• Bs mixing observables and Vtd/Vts from sum rules
• Rare decay B -> K ll form factors from lattice QCD
• Constraints on Lepton Universality Violation from Rare $B$ Decays
• 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
• Status of the semileptonic $B$ decays and muon g-2 in general 2HDMs with right-handed neutrinos
• Search for charged Higgs bosons decaying into a top quark and a bottom quark at $\sqrt{s}$=13 TeV with the ATLAS detector
• Measurement of lepton universality parameters in $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ and $B^0\to K^{\ast 0}{\ell }^{+}{\ell }^{-}$ decays
• Non-local matrix elements in $B_{(s)}\to \{K^{(\ast )},\varphi \}{\ell }^{+}{\ell }^{-}$
• Rare $b$ decays meet high-mass Drell-Yan
• One constraint to kill them all?
• Implications of new evidence for lepton-universality violation in $b\to s{\ell }^{+}{\ell }^{-}$ decays
• To (b)e or not to (b)e: No electrons at LHCb
• Search for low-mass dijet resonances using trigger-level jets with the ATLAS detector in $pp$ collisions at $\sqrt{s}=13$ TeV
• Angular analysis of the $B^{+}\to K^{\ast +}{\mu }^{+}{\mu }^{-}$ decay
• Analysis of neutral $B$-meson decays into two muons
• Generic Loop Effects of New Scalars and Fermions in $b\to s{\ell }^{+}{\ell }^{-}$, $(g-2{)}_{\mu }$ and a Vector-like $4^{\mathrm{th}}$ Generation
• $b\to s\ell \ell$ Global Fits after $R_{K_S}$ and $R_{K^{\ast +}}$
• More Indications for Lepton Nonuniversality in $b\to s{\ell }^{+}{\ell }^{-}$
• Forward-backward asymmetry in t anti-t production from flavour symmetries
• Loop effects of heavy new scalars and fermions in $b\to s{\mu }^{+}{\mu }^{-}$
• Linear flavour violation and anomalies in B physics
• Flavourful Production at Hadron Colliders
• Measurement of the B${}_{\mathrm{S}}^0$ $\to$ ${\mu }^{+}{\mu }^{-}$ decay properties and search for the B${}^0$ $\to$ ${\mu }^{+}{\mu }^{-}$ decay in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• $b\to s{\ell }^{+}{\ell }^{-}$ Transitions in Two-Higgs-Doublet Models
• Explaining the t tbar forward-backward asymmetry without dijet or flavor anomalies
• Implications for New Physics in $b\to s\mu \mu$ transitions after recent measurements by Belle and LHCb
• Angular analysis and branching fraction measurement of the decay B0 to K*0 mu+ mu-
• Standard Model predictions for $B\to K{\ell }^{+}{\ell }^{-}$, $B\to K{\ell }_1^{-}{\ell }_2^{+}$ and $B\to K\nu \bar{\nu }$ using form factors from $N_f=2+1+1$ lattice QCD
• Forward-backward asymmetry in top quark production from light colored scalars in SO(10) model
• New methods for B meson decay constants and form factors from lattice NRQCD
• Mass of the b-quark and B-decay constants from Nf=2+1+1 twisted-mass Lattice QCD
• Two-body non-leptonic heavy-to-heavy decays at NNLO in QCD factorization
• Vector Leptoquarks Beyond Tree Level
• On new physics in $\Delta {\Gamma }_d$
• Correlating Lepton Flavour (Universality) Violation in $B$ Decays with $\mu \to e\gamma$ using Leptoquarks
• Colored Resonances at the Tevatron: Phenomenology and Discovery Potential in Multijets
• Scalar Representations and Minimal Flavor Violation
• Charming new physics in rare B-decays and mixing?
• The inclusive decay b to ccs revisited
• Searching for Top Flavor Violating Resonances
• A puzzle in ${\bar{B}}_{(s)}^0\to D_{(s)}^{(\ast )+}\{{\pi }^{-},K^{-}\}$ decays and extraction of the $f_s/f_d$ fragmentation fraction
• Confronting the vector leptoquark hypothesis with new low- and high-energy data
• Precision calculations of $B_{d,s}\to \pi ,K$ decay form factors in soft-collinear effective theory
• Correlating ${\epsilon }^{\prime }/\epsilon$ to hadronic $B$ decays via $U(2{)}^3$ flavour symmetry
• Mounting Evidence for the Violation of Lepton Flavor Universality
• Exploiting dijet resonance searches for flavor physics
• Disentangling Lepton Flavour Universal and Lepton Flavour Universality Violating Effects in $b\to s{\ell }^{+}{\ell }^{-}$ Transitions
• $D^0$-${\overline{D}}^0$ mixing parameter $y$ in the factorization-assisted topological-amplitude approach
• Long-Distance Contributions to D^0-D^0bar Mixing Parameters
• B_s -> phi rho^0 and B_s -> phi pi^0 as a handle on isospin-violating New Physics
• Light Colored Scalar as Messenger of Up-Quark Flavor Dynamics in Grand Unified Theories
• $B$-anomalies in a twin Pati-Salam theory of flavour including the 2022 LHCb $R_{K^{(\ast )}}$ analysis
• Lepton non-universality in $B$ decays and fermion mass structure
• Exploring $B\to \pi \pi ,\pi K$ Decays at the High-Precision Frontier
• Contribution of the Darwin operator to non-leptonic decays of heavy quarks
• Probing the Exotic Particle Content Beyond the Standard Model
• ${\epsilon }^{\prime }/\epsilon$ in the Standard Model at the Dawn of the 2020s
• Strong constraints on the $b\to s\gamma$ photon polarisation from $B^0\to K^{\ast 0}{e}^{+}{e}^{-}$ decays
• Renormalisation scale setting for D-mixing
• A new $B$-flavour anomaly in $B_{d,s}\to K^{\ast 0}{\bar{K}}^{\ast 0}$: anatomy and interpretation
• Angular analysis of the decay B${}^{+}$ $\to$ K${}^{\ast }$(892)${}^{+}{\mu }^{+}{\mu }^{-}$ in proton-proton collisions at $\sqrt{s}=$ 8 TeV
• Charming New $B$-Physics
• Revisiting rescattering contributions to ${\overline{B}}_{(s)}\to D_{(s)}^{(\ast )}M$ decays
• Search for resonant and nonresonant production of pairs of dijet resonances in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Coup de grace to the charged Higgs solution of $P_5^{\prime }$ and $R_{D^{(\ast )}}$ discrepancies
• LHC Constraints on Scalar Diquarks
• SMEFT ATLAS of $\Delta F=2$ Transitions
• Using $B_s^0\to D_s^{\mp }{K}^{\pm }$ Decays as a Portal to New Physics
• Revealing New Physics in $B_s^0\to D_s^{\mp }{K}^{\pm }$ Decays
• Consistency and Interpretation of the LHC (Di-)Di-Jet Excesses
• Hadronic production of light color-triplet Higgs bosons: an alternative signature for GUT
• The ${\epsilon }^{\prime }/\epsilon$-Story: 1976-2021
• Interplay of the charged Higgs effects in $R_{D^{(\ast )}}$, $b\to s{\ell }^{+}{\ell }^{-}$ and $W$-mass
• ${\tau }_{B_s}/{\tau }_{B_d}$ and $\Delta {\Gamma }_s$ confront new physics in $b\to s\tau \tau$

Cited by in corpus (4)

• Anomalies in Particle Physics
• HQET sum rules for matrix elements of dimension-six four-quark operators for meson lifetimes within and beyond the Standard Model
• Doubling down on down-type diquarks
• TeV-scale scalar leptoquarks motivated by B anomalies improve Yukawa unification in SO(10) GUT