Loop effects of heavy new scalars and fermions in $b\to s{\mu }^{+}{\mu }^{-}$

Abstract

Recent measurements of $b\to s{\mu }^{+}{\mu }^{-}$ processes at LHCb and BELLE have revealed tensions at the $2-3\sigma$ level between the Standard Model (SM) prediction and the experimental results in the channels $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$ and $B_s\to \varphi {\mu }^{+}{\mu }^{-}$, as well as in the lepton-flavor universality violating observable $R_K=\mathrm{Br}(B\to K{\mu }^{+}{\mu }^{-})/\mathrm{Br}(B\to K{e}^{+}{e}^{-}$). Combined global fits to the available $b\to s{\mu }^{+}{\mu }^{-}$ data suggest that these tensions might have their common origin in New Physics (NP) beyond the SM because some NP scenarios turn out to be preferred over the SM by $4-5\sigma$. The fact that all these anomalies are related to muons further suggests a connection (and a common NP explanation) with the long-standing anomaly in the anomalous magnetic moment of the muon, $a_{\mu }$. In this article, we study the impact of a generic class of NP models featuring new heavy scalars and fermions that couple to the SM fermions via Yukawa-like interactions. We consider two different scenarios, introducing either one additional fermion and two scalars or two additional fermions and one scalar, and examine all possible representations of the new particles under the SM gauge group with dimension up to the adjoint one. The models induce one-loop contributions to $b\to s{\mu }^{+}{\mu }^{-}$ and $a_{\mu }$ which are capable of solving the respective anomalies at the $2\sigma$ level, albeit a relatively large coupling of the new particles to muons is required. In the case of $b\to s{\mu }^{+}{\mu }^{-}$, stringent constraints from $B_s-{\overline{B}}_s$ mixing arise which can be relaxed if the new fermion is a Majorana particle.

24 pages, 7 figures, discussion of D-meson mixing and Z --> mu^+ mu^- added, conclusions unchanged, journal version

References in corpus (18)

• Hadronic contribution to the muon anomalous magnetic moment to next-to-next-to-leading order
• Neutrino Trident Production: A Powerful Probe of New Physics with Neutrino Beams
• On the Standard Model predictions for $R_K$ and $R_{K^{\ast }}$
• Updated NNLO QCD predictions for the weak radiative B-meson decays
• Explaining $h\to {\mu }^{\pm }{\tau }^{\mp }$, $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$ and $B\to K{\mu }^{+}{\mu }^{-}/B\to K{e}^{+}{e}^{-}$ in a two-Higgs-doublet model with gauged $L_{\mu }-L_{\tau }$
• The Muon Magnetic Moment and Supersymmetry
• Non-abelian gauge extensions for B-decay anomalies
• On the impact of power corrections in the prediction of B->K*mu+mu- observables
• On the anomalies in the latest LHCb data
• Limiting two-Higgs-doublet models
• Lepton flavor violating Z' explanation of the muon anomalous magnetic moment
• Phenomenology of an $SU(2)\times SU(2)\times U(1)$ model with lepton-flavour non-universality
• A Natural origin for the LHCb anomalies
• A light pseudoscalar of 2HDM confronted with muon g-2 and experimental constraints
• Search for new physics in same-sign dilepton events in proton-proton collisions at sqrt(s) = 13 TeV
• Massive vectors and loop observables: the $g-2$ case
• Search for bottom squark pair production in proton--proton collisions at $\sqrt{s}=$13 TeV with the ATLAS detector
• Precision tools and models to narrow in on the 750 GeV diphoton resonance

Cited by in corpus (70)

• Patterns of New Physics in $b\to s{\ell }^{+}{\ell }^{-}$ transitions in the light of recent data
• Simultaneous Explanation of $R(D^{(\ast )})$ and $b\to s{\mu }^{+}{\mu }^{-}$: The Last Scalar Leptoquarks Standing
• Flavour anomalies after the $R_{K^{\ast }}$ measurement
• A model of vector leptoquarks in view of the $B$-physics anomalies
• High-$p_T$ dilepton tails and flavour physics
• Review of Lepton Universality tests in B decays
• New Physics in $b\to s{\ell }^{+}{\ell }^{-}$ confronts new data on Lepton Universality
• Gauge-invariant implications of the LHCb measurements on Lepton-Flavour Non-Universality
• A Proof of Concept for Matchete: An Automated Tool for Matching Effective Theories
• Lepton flavor universality violation without new sources of quark flavor violation
• 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
• Consequences of chirally enhanced explanations of $(g-2{)}_{\mu }$ for $h\to \mu \mu$ and $Z\to \mu \mu$
• Muon $g-2$ and $B$-anomalies from Dark Matter
• Implications for New Physics in $b\to s\mu \mu$ transitions after recent measurements by Belle and LHCb
• Complete Vector-like Fourth Family and new $\mathrm{U}(1{)}^{\prime }$ for Muon Anomalies
• $B$ decay anomalies and dark matter from vectorlike confinement
• Flavor anomalies and dark matter in SUSY with an extra U(1)
• Vector-like Singlet Quarks: a Roadmap
• Unveiling Hidden Physics at the LHC
• Charming new physics in rare B-decays and mixing?
• Combined Explanation of the $Z\to b\bar{b}$ Forward-Backward Asymmetry, the Cabibbo Angle Anomaly, $\tau \to \mu \nu \nu$ and $b\to s{\ell }^{+}{\ell }^{-}$ Data
• Impact of the $b\to sll$ anomalies on dark matter physics
• Muon $g-2$ in two Higgs doublet models with vectorlike leptons
• Large $t\to cZ$ as a Sign of Vector-Like Quarks in Light of the $W$ Mass
• Simplified Models of Flavourful Leptoquarks
• Global Fit of Modified Quark Couplings to EW Gauge Bosons and Vector-Like Quarks in Light of the Cabibbo Angle Anomaly
• Disentangling Lepton Flavour Universal and Lepton Flavour Universality Violating Effects in $b\to s{\ell }^{+}{\ell }^{-}$ Transitions
• Complete Vector-like Fourth Family with ${\mathrm{U}(1)}^{\prime }$: A Global Analysis
• The CKM Phase and $\bar{\theta }$ in Nelson-Barr Models
• Flavor Non-universality Gauge Interactions and Anomalies in B-Meson Decays
• Seeking leptoquarks in IceCube
• $R_K$ and $R_{K^{\ast }}$ in an Aligned 2HDM with Right-Handed Neutrinos
• Reconciling dark matter, $R_{K^{(\ast )}}$ anomalies and $(g-2{)}_{\mu }$ in an $L_{\mu }-L_{\tau }$ scenario
• Highly enhanced contributions of heavy Higgs bosons and new leptons to muon $g-2$ and prospects at future colliders
• B anomalies and dark matter: a complex connection
• New physics in $b\to s\ell \ell$ transitions at one loop
• Lepton non-universality in $B$ decays and fermion mass structure
• Review of Semileptonic $B$ Anomalies
• Gauge contribution to the $1/N_F$ expansion of the Yukawa coupling beta function
• Dark matter for $b\to s{\mu }^{+}{\mu }^{-}$ anomaly in a gauged $U(1{)}_X$ model
• $B$ decay anomalies from nonabelian local horizontal symmetry
• Simple model for large CP violation in charm decays, B-physics anomalies, muon g-2, and Dark Matter
• Anomalies in $B$ Decays and Muon $g-2$ from Dark Loops
• Hadron Collider Sensitivity to Fat Flavourful $Z^{\prime }$s for $R_{K^{(\ast )}}$
• Systematic approach to $B$-physics anomalies and $t$-channel dark matter
• Towards excluding a light $Z^{\prime }$ explanation of $b\to s{\ell }^{+}{\ell }^{-}$
• Finite Family Groups for Fermionic and Leptoquark Mixing Patterns
• Flavour anomalies from a split dark sector
• Scalar dark matter behind $b\to s\mu \mu$ anomaly
• Neutrino and dark matter in a gauged $U(1{)}_R$ symmetry
• Anomalies in $b\to s$ transitions and dark matter
• One colorful resolution to the neutrino mass generation, three lepton flavor universality anomalies, and the Cabibbo angle anomaly
• Data-driven study of the implications of anomalous magnetic moments and lepton flavor violating processes of $e$, $\mu$ and $\tau$
• Next-to-Leading-Order QCD Matching for $\Delta F=2$ Processes in Scalar Leptoquark Models
• Probing New Physics in the Vector-like Lepton Model by Lepton Electric Dipole Moments
• Diquark Explanation of $b\to s{\ell }^{+}{\ell }^{-}$
• Generic One-Loop Matching Conditions for Rare Meson Decays
• Explaining the $R_K$ and $R_{K^{\ast }}$ Anomalies With Right-handed Sneutrino
• Collider Signatures of a Scalar Leptoquark and Vector-like Lepton in Light of Muon Anomaly
• A connection between flavour anomaly, neutrino mass, and axion
• Neutrino masses, flavor anomalies and muon $\mathbf{g}-2$ from dark loops
• Dark matter, $Z^{\prime }$, vector-like quark at the LHC and $b\to s\mu \mu$ anomaly
• Impact of electroweak group representation in models for $B$ and $g-2$ anomalies from Dark Loops
• Muon $g-2$ and semileptonic $B$ decays in Bélanger-Delaunay-Westhoff model with gauge kinetic mixing
• Fermionic Singlet Dark Matter in One-Loop Solutions to the $R_K$ Anomaly: A Systematic Study
• A model with flavor-dependent gauged $U(1{)}_{B-L_1}\times U(1{)}_{B-L_2-L_3}$ symmetry
• TeV-scale vector leptoquark from Pati-Salam unification with vectorlike families
• The Radiative Flavor Template at the LHC: Lepton non-universality and g-2
• Perturbative unitarity constraints on generic Yukawa interactions
• Rare b-hadron decays as probe of new physics