Leptoquarks and Neutrino Masses at the LHC

Abstract

The properties of light leptoquarks predicted in the context of a simple grand unified theory and their observability at the LHC are investigated. The SU(5) symmetry of the theory implies that the leptoquark couplings to matter are related to the neutrino mass matrix. We study the resulting connection between neutrino masses and mixing parameters and the leptoquark decays, and show that different light neutrino hierarchies imply distinctive leptoquark decay signatures. We also discuss low-energy constraints implied by searches for charged lepton flavour violation, studies of meson decays, and electroweak precision data. We perform a detailed parton-level study of the leptoquark signals and the Standard Model backgrounds at the LHC. With the clean final states containing a di-lepton plus two jets, the QCD production of the leptoquark pair can be observed for a leptoquark mass of one TeV and beyond. By examining the lepton flavor structure of the observed events, one could further test the model predictions related to the neutrino mass spectrum. In particular, b-flavor tagging will be useful in distinguishing the neutrino mass pattern and possibly probing an unknown Majorana phase in the Inverted Hierarchy or the Quasi-Degenerate scenario. Electroweak associated production of the leptoquark doublet can also be useful in identifying the quantum numbers of the leptoquarks and distinguishing between the neutrino mass spectra, even though the corresponding event rates are smaller than for QCD production. We find that with only the clean channel of mu+ E_T jets, one could expect an observable signal for a leptoquark masses of about 600 GeV or higher.

arXiv comment46 pages, 52 figures

References in corpus (39)

• The Cosmological Parameters 2006
• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• Minimal Dark Matter
• MadEvent: Automatic Event Generation with MadGraph
• Phenomenology with Massive Neutrinos
• Status of global fits to neutrino oscillations
• Proton stability in grand unified theories, in strings, and in branes
• Detailed calculation of lepton flavor violating muon-electron conversion rate for various nuclei
• Model independent constraints on leptoquarks from rare processes
• Neutrino Masses and the LHC: Testing Type II Seesaw
• Neutrino masses and mixings and...
• Pair production of scalar leptoquarks at the LHC
• Unification without supersymmetry: neutrino mass, proton decay and light leptoquarks
• A Comprehensive Study of Leptoquark Bounds
• Much Ado About Leptoquarks: A Comprehensive Analysis
• Long-distance contributions to the K_L --> mu+ mu- decay width
• Large underground, liquid based detectors for astro-particle physics in Europe: scientific case and prospects
• Theory and Phenomenology of Exotic Isosinglet Quarks and Squarks
• Leptoquarks: Neutrino masses and accelerator phenomenology
• Leptoquark Single and Pair production at LHC with CalcHEP/CompHEP in the complete model
• Phenomenological and Cosmological Aspects of a Minimal GUT Scenario
• Testing a Neutrino Mass Generation Mechanism at the Large Hadron Collider
• How Long Could We Live?
• Fermion Masses and the UV Cutoff of the Minimal Realistic SU(5)
• Search for Second-Generation Scalar Leptoquarks in $\mathbf{p}\bar{\mathbf{p}}$ Collisions at $\sqrt{s}$=1.96 TeV
• Constraints from Precision Electroweak Data on Leptoquarks and Bileptons
• Neutrino oscillations: present status and outlook
• Signal and Backgrounds for Leptoquarks at the LHC
• Search for pair production of second generation scalar leptoquarks
• S, T, and Leptoquarks at HERA
• Search for third generation scalar leptoquarks decaying into tau b
• Search for Second and Third Generation Leptoquarks Including Production via Technicolor Interactions in $p\bar{p}$ collisions at $\sqrt{s}=1.8$ TeV
• Search for First-Generation Scalar Leptoquarks in $\mathbf{p}\bar{\mathbf{p}}$ collisions at $\sqrt{s}$=1.96 TeV
• Search for first-generation scalar leptoquarks in ppbar collisions at sqrt(s)=1.96 TeV
• Bounds on scalar leptoquark and scalar gluon masses from S, T, U in the minimal four color symmetry model
• Study of leptoquark pair production at the LHC with the CMS detector
• Prospects for Scalar Leptoquark Discovery at the LHC
• Upper Bound on the Proton Lifetime and the Minimal Non-SUSY Grand Unified Theory
• Short- and long-distance contributions to the rare decay K_L-->mu+ mu-

Cited by in corpus (24)

• Physics of leptoquarks in precision experiments and at particle colliders
• Composite Leptoquarks at the LHC
• One Leptoquark to unify them? Neutrino masses and unification in the light of $(g-2{)}_{\mu }$, $R_{D^{(\star )}}$ and $R_K$ anomalies
• Leptoquarks, Dark Matter, and Anomalous LHC Events
• Charged Lepton Flavor Violation at the EIC
• Enhanced $B_s$--${\bar{B}}_s$ lifetime difference and anomalous like-sign dimuon charge asymmetry from new physics in $B_s\to {\tau }^{+}{\tau }^{-}$
• Minimal Flavour Violation for Leptoquarks
• Minimal Matter at the Large Hadron Collider
• Low Scale Quark-Lepton Unification
• Neutrino Masses and Heavy Triplet Leptons at the LHC: Testability of Type III Seesaw
• Effective Theory and Simple Completions for Neutrino Interactions
• Constraining Scalar Leptoquarks from the K and B Sectors
• Electron-to-Tau Lepton Flavor Violation at the Electron-Ion Collider
• Interpreting the CMS ${\ell }^{+}{\ell }^{-}jjE{/}_{\mathrm{T}}$ Excess with a Leptoquark Model
• LSP Squark Decays at the LHC and the Neutrino Mass Hierarchy
• New Paradigm for Baryon and Lepton Number Violation
• Effective Operator Bases for Beyond Standard Model Scenarios: An EFT compendium for discoveries
• Lepton Flavour Violation in minimal grand-unified type II seesaw models
• Leptoquarks decaying to a top quark and a charged lepton at hadron colliders
• Seesaw Type I and III at the LHeC
• Type-II Majoron Dark Matter
• Probing Quark-Lepton Unification with Leptoquark and Higgs Decays
• Can Flavor Physics Hint at Distinctive Signals for R-parity Violation at the LHC?
• Matter Unification and Lepton Flavour Violation