TeV-scale scalar leptoquarks motivated by B anomalies improve Yukawa unification in SO(10) GUT

Abstract

It is common practice to explain deviations between data and Standard-Model (SM) predictions by postulating new particles at the TeV scale ad-hoc. This approach becomes much more convincing, if one successfully embeds the postulated particles into a UV completion which addresses other conceptual or phenomenological shortcomings of the SM. We present a study of an SO(10) grand unified theory which contains scalar leptoquark fields employed to explain the ``flavour anomalies'' in $b\to s$ and $b\to c$ decays. We find that the additional degrees of freedom improve the renormalization-group (RG) evolution of the SM parameters. In particular, the light leptoquarks modify the RG evolution of the Yukawa couplings such that successful bottom-tau unification becomes possible in a minimal SO(10) GUT with only a $126$-plet coupling to fermions. If we amend the Yukawa interaction of the minimal one-generation model with a second fermion multiplet and small flavor-violating terms, we find the flavour violation in the leptoquark couplings growing with the RG evolution while it stays small in the Yukawa interaction of the SM Higgs boson. By employing mass splittings among the members of the $126$-plet one can increase the effect and obtain large flavor violation in leptoquark couplings from tiny perturbations at the GUT scale, because the flavour-conserving limit is an unstable initial condition for the RG equations.

arXiv comment29 pages, 6 figures; v2: version published in JHEP

References in corpus (89)

• Theory and phenomenology of two-Higgs-doublet models
• The Top Quark Mass in Supersymmetric SO(10) Unification
• Physics of leptoquarks in precision experiments and at particle colliders
• Effective lagrangian for the tbH^+ interaction in the MSSM and charged Higgs phenomenology
• Charm-loop effect in $B\to K^{(\ast )}{\ell }^{+}{\ell }^{-}$ and $B\to K^{\ast }\gamma$
• Renormalization of the Neutrino Mass Operator
• Flavor-phenomenology of two-Higgs-doublet models with generic Yukawa structure
• Simultaneous Explanation of $R(D^{(\ast )})$ and $b\to s{\mu }^{+}{\mu }^{-}$: The Last Scalar Leptoquarks Standing
• A three-site gauge model for flavor hierarchies and flavor anomalies
• U(2) and Minimal Flavour Violation in Supersymmetry
• Gauge leptoquark as the origin of B-physics anomalies
• On the Unification of Couplings in the Minimal Supersymmetric Standard Model
• A model of vector leptoquarks in view of the $B$-physics anomalies
• b-tau unification and large atmospheric mixing: a case for non-canonical see-saw
• Flavour physics from an approximate U(2)^3 symmetry
• Importance of Loop Effects in Explaining the Accumulated Evidence for New Physics in B Decays with a Vector Leptoquark
• Running quark and lepton parameters at various scales
• Scalar leptoquarks from GUT to accommodate the $B$-physics anomalies
• Lepton-flavour violating $B$ decays in generic $Z^{\prime }$ models
• Seesaw at LHC
• Third Family Quark-Lepton Unification at the TeV Scale
• Simultaneous Explanation of the $R_K$ and $R_{D^{(\ast )}}$ Puzzles: a Model Analysis
• Unification without supersymmetry: neutrino mass, proton decay and light leptoquarks
• Reconsidering the One Leptoquark solution: flavor anomalies and neutrino mass
• Long-distance effects in $B\to K^{\ast }\ell \ell$ from Analyticity
• Revisiting the one leptoquark solution to the $R(D^{(\ast )})$ anomalies and its phenomenological implications
• Fermion Masses in SO(10) Models
• Intermediate mass scales in the non-supersymmetric SO(10) grand unification: a reappraisal
• Constraints on Lepton Universality Violation from Rare $B$ Decays
• Minimal Flavour Violation and Beyond
• Yukawa sector in non-supersymmetric renormalizable SO(10)
• Fits to SO(10) Grand Unified Models
• Constraining new physics in $b\to c\ell \nu$ transitions
• To (b)e or not to (b)e: No electrons at LHCb
• Electric Charge Quantization
• SO(10) a la Pati-Salam
• Flavourful Production at Hadron Colliders
• Generation of large flavor mixing from radiative corrections
• Flavour symmetries in the SMEFT
• Yukawa Sector of Minimal SO(10) Unification
• Precise Values of Running Quark and Lepton Masses in the Standard Model
• A near-minimal leptoquark model for reconciling flavour anomalies and generating radiative neutrino masses
• Flavor hierarchies, flavor anomalies, and Higgs mass from a warped extra dimension
• Renormalization Effect on Large Neutrino Flavor Mixing in the Minimal Supersymmetric Standard Model
• Predictions from type II see-saw mechanism in SU(5)
• Neutrino masses and LFV from minimal breaking of U(3)^5 and U(2)^5 flavor symmetries
• Dispersive Analysis of $B\to K^{(\ast )}$ and $B_s\to \varphi$ Form Factors
• New Physics Models of Direct CP Violation in Charm Decays
• Scalar Representations and Minimal Flavor Violation
• Seesaw Scale in the Minimal Renormalizable SO(10) Grand Unification
• Implications of LEP Results for SO(10) Grandunification with Two Intermediate Stages
• Testing Leptoquark/EFT in $\bar{B}\to D^{(\ast )}l\bar{\nu }$ at the LHC
• Asymptotically Safe Grand Unification
• Unification versus proton decay in SU(5)
• Testing the neutrality of matter by acoustic means in a spherical resonator
• Anomalies in Particle Physics
• Revisit to the $b\to c\tau \nu$ transition: in and beyond the SM
• Light vector-like fermions in a minimal SU(5) setup
• Leptogenesis and fermion mass fit in a renormalizable $SO(10)$ model
• Stability of Texture Zeros under Radiative Corrections in See-Saw Models
• Large Neutrino Mixing from Renormalization Group Evolution
• Radiative seesaw: a case for split supersymmetry
• Standard Model parameters in the tadpole-free pure $\overline{\mathrm{MS}}$ scheme
• Fits to Non-Supersymmetric SO(10) Models with Type I and II Seesaw Mechanisms Using Renormalization Group Evolution
• Electroweak-flavour and quark-lepton unification: a family non-universal path
• Global fit to $b\to c\tau \nu$ anomalies as of Spring 2024
• Can Supersymmetric Loops Correct the Fermion Mass Relations in SU(5)?
• Towards ruling out the charged Higgs interpretation of the $R_{D^{(\ast )}}$ anomaly
• Renormalization Group Running of Fermion Observables in an Extended Non-Supersymmetric SO(10) Model
• On the Minimal Flavor Violating Leptoquark Explanation of the $R_{D^{(\ast )}}$ Anomaly
• A Class of Models with the Potential to Represent Fundamental Physics
• $B$-decay anomalies and scalar leptoquarks in unified Pati-Salam models from noncommutative geometry
• Discriminating $B\to D^{\ast }\ell \nu$ form factors via polarization observables and asymmetries
• New Class of SO(10) Models for Flavor
• SO(10): a Case for Hadron Colliders
• Radiative seesaw and degenerate neutrinos
• Confronting SUSY SO(10) with updated Lattice and Neutrino Data
• Minimal spontaneous CP-violating GUT and predictions for leptonic CP phases
• Diquark Explanation of $b\to s{\ell }^{+}{\ell }^{-}$
• Neutrinoless Double Beta Decay from Scalar Leptoquarks: Interplay with Neutrino Mass and Flavor Physics
• Charm rescattering in $B^0\to K^0\bar{\ell }\ell$: an improved analysis
• Flavor physics in SU(5) GUT with scalar fields in the 45 representation
• The Standard Model quark/lepton masses and the Cabibbo-Kobayashi-Maskawa mixing in an $\mathrm{SU}(8)$ theory
• Data-driven analyses and model-independent fits for present $b\to s\ell \ell$ results
• Spectrum of colour sextet scalars in realistic SO(10) GUT
• Bottom quark and tau lepton masses in a toy $\mathrm{SU}(6)$
• Quantum corrections and the minimal Yukawa sector of $SU(5)$
• Asymptotic grand unification in SO(10) with one extra dimension
• How common are grand unified theories?