Heavy and light scalar leptoquarks in proton decay

Abstract

We list scalar leptoquarks that mediate proton decay via renormalizable couplings to the Standard Model fermions. We employ a general basis of baryon number violating operators to parameterize contributions of each leptoquark towards proton decay. This then sets the stage for investigation of bounds on the leptoquark couplings to fermions with respect to the most current Super Kamiokande results on proton stability. We quantify if, and when, it is necessary to have leptoquark masses close to a scale of grand unification in the realistic SU(5) and flipped SU(5) frameworks. The most and the least conservative lower bounds on the leptoquark masses are then presented. We furthermore single out a leptoquark without phenomenologically dangerous tree-level exchanges that might explain discrepancy of the forward-backward asymmetries in $t\bar{t}$ production observed at Tevatron, if relatively light. The same state could also play significant role in explaining muon anomalous magnetic moment. We identify contributions of this leptoquark to dimension-six operators, mediated through a box diagram, and tree-level dimension-nine operators, that would destabilize proton if sizable leptoquark and diquark couplings were to be simultaneously present.

26 pp, 2 figures, extensive expansion of Section V with new results

References in corpus (7)

• Constraints on two-lepton, two quark operators
• Renormalizable Adjoint SU(5)
• Search for Nucleon Decay into Charged Anti-lepton plus Meson in Super-Kamiokande I and II
• Proton lifetime bounds from chirally symmetric lattice QCD
• Fermion Masses and the UV Cutoff of the Minimal Realistic SU(5)
• Light Colored Scalar as Messenger of Up-Quark Flavor Dynamics in Grand Unified Theories
• Realistic model for SU(5) grand unification

Cited by in corpus (53)

• Physics of leptoquarks in precision experiments and at particle colliders
• Scalar leptoquarks from GUT to accommodate the $B$-physics anomalies
• $R_K$ and $R_{K^{\ast }}$ beyond the Standard Model
• Leptoquark Flavor Patterns & B Decay Anomalies
• Minimally flavored colored scalar in $\bar{B}\to D^{(\ast )}\tau \bar{\nu }$ and the mass matrices constraints
• Simplified models with baryon number violation but no proton decay
• Observable Effects of General New Scalar Particles
• Lepton flavor non-universality in $b\to s{\ell }^{+}{\ell }^{-}$ processes
• Flavor & new physics opportunities with rare charm decays into leptons
• The phenomenology of electric dipole moments in models of scalar leptoquarks
• Cornering Scalar Leptoquarks at LHC
• Leptoquark mechanism of neutrino masses within the grand unification framework
• Correlating $h\to {\mu }^{+}{\mu }^{-}$ to the Anomalous Magnetic Moment of the Muon via Leptoquarks
• Inclusive Nucleon Decay Searches as a Frontier of Baryon Number Violation
• Neutrino Masses, Grand Unification, and Baryon Number Violation
• Coupling Unification, GUT-Scale Baryogenesis and Neutron-Antineutron Oscillation in SO(10)
• Model independent constraints on leptoquarks from b -> s l+ l- processes
• Higgs Uncovering Light Scalar Remnants of High Scale Matter Unification
• Coloured Scalar Mediated Nucleon Decays to Invisible Fermion
• Universal Scalar Leptoquark Action for Matching
• Scalar Leptoquarks, Baryon Number Violation and Pati-Salam Symmetry
• An EFT approach to baryon number violation: lower limits on the new physics scale and correlations between nucleon decay modes
• Scalar leptoquark in SU(5)
• Phenomenology of Scalar Leptoquarks at the LHC in Explaining the Radiative Neutrino Mass, Muon $g-2$ and Lepton Flavour Violating Observables
• Is symmetry breaking of SU(5) theory responsible for the diphoton excess?
• SU(5) Unification without Proton Decay
• Neutrino mass models: New classification and model-independent upper limits on their scale
• The landscape of promising non-supersymmetric string models
• Phenomenology of TeV-scale scalar Leptoquarks in the EFT
• Signatures of Leptoquarks at the LHC and Right-handed Neutrinos
• B Anomalies and Leptoquarks at the LHC: Beyond the Lepton-Quark Final State
• The minimal adjoint-SU(5)xZ_4 GUT model
• Nucleon decay via dimension 6 operators in anomalous U(1)_A SUSY GUT
• Phenomenology of SU(5) low-energy realizations: the diphoton excess and Higgs flavor violation
• Anatomy of scalar mediated proton decays in $SO(10)$ models
• Neutrinoless Double Beta Decay from Scalar Leptoquarks: Interplay with Neutrino Mass and Flavor Physics
• $B-L$ violating nucleon decays as a probe of leptoquarks and implications for baryogenesis
• Nonholomorphic $A_4$ modular invariance for fermion masses and mixing in SU(5) GUT
• High Scale Type-II Seesaw, Dominant Double Beta Decay within Cosmological Bound and Verifiable LFV Decays in SU(5)
• Enhancement of the double Higgs production via leptoquarks at the LHC
• Baryon Number Violation: From Nuclear Matrix Elements to BSM Physics
• Direct production of SM-singlet scalars at the muon collider
• Higgs-portal dark matter from non-supersymmetric strings
• Decay dynamics of $N\to \ell \pi$ and $N\to \ell \gamma$
• Revisiting the Scalar Leptoquark ($S_1$) Model with the Updated Leptonic Constraints
• Neutrino Mass, Coupling Unification, Verifiable Proton Decay, Vacuum Stability and WIMP Dark Matter in SU(5)
• Gauge coupling unification and proton decay via 45 Higgs boson in SU(5) GUT
• Grand Unified Theory with a Stable Proton
• CP Asymmetry in $\tau \to K\pi {\nu }_{\tau }$ within Non-Minimal $SU(5)$
• The E6 route to multicomponent dark matter
• Proton Stability in $SU(5)\times U(1)$ and $SU(6)\times SU(2)$ GUTs
• Scalar-induced Neutrinoless Double Beta Decay in $SU(5)$
• Proton Decay and the Quantum Structure of Spacetime