Phenomenology of Scalar Leptoquarks at the LHC in Explaining the Radiative Neutrino Mass, Muon $g-2$ and Lepton Flavour Violating Observables

TL;DR

This paper explores a scalar leptoquark extension of the Standard Model that explains neutrino masses, muon g-2 anomalies, and lepton flavor violation, analyzing collider signatures at the LHC and FCC energies.

Contribution

It introduces a specific doublet-singlet scalar leptoquark model and studies its phenomenology, including collider signatures and distinguishing features of leptoquark states.

Findings

Leptoquark states can be distinguished at colliders with multiple final states.

Pure and mixed leptoquark states have distinguishable collider signatures.

The model is consistent with neutrino oscillation data and lepton flavor violation bounds.

Abstract

We study the phenomenology of a particular leptoquark extension of the Standard Model (SM), namely the doublet-singlet scalar leptoquark extension of the SM (DSL-SM). Besides generating Majorana mass for neutrinos, these leptoquarks contribute to muon and electron $(g-2)$ and various lepton flavour violating processes. Collider signatures of the benchmark points (BPs), consistent with the neutrino oscillation data, anomalous muon/electron magnetic moments, experimental bounds on the charged lepton flavour violation observables, etc., are studied at the LHC/FCC with centre-of-mass energies of 14, 27 and 100 TeV. While the two $-1/3$ charged colored scalars from singlet and doublet leptoquark mix with each other, the charge $2/3$ colored scalar from the doublet leptoquark remains pure. With a near-degenerate mass spectrum, the pure and mixed leptoquark states are shown to be distinguishable from multiple finalstates, while discerning between the two mixed states remain very challenging.