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Neutrinos and leptoquarks

Grant number: 23/12330-7
Support Opportunities:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): February 01, 2024
Effective date (End): January 31, 2025
Field of knowledge:Physical Sciences and Mathematics - Physics - Elementary Particle Physics and Fields
Principal Investigator:Renata Zukanovich Funchal
Grantee:Luighi Pierre Santos Leal
Supervisor: Olcyr de Lima Sumensari
Host Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Research place: Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), France  
Associated to the scholarship:21/02283-6 - Neutrinos and Violation of the Lepton Charge, BP.DR

Abstract

After the discovery of the Higgs boson by the LHC experiments in 2012, although no other fundamental particle has been observed but many hints from Beyond the Standard Model (BSM) physics seems come from the flavor sector both from the lepton and the quark sectors. On the one hand, in the lepton sector, neutrino oscillations that have been observed by a variety of experiments are evidences for neutrino masses and mixings. The origin, however, of neutrino masses remains a mystery. We believe it must stem from BSM physics and that new particles are needed to account for them. If neutrinos are Majorana particles, neutrino masses could be described by the only dimension 5 operator allowed by the SM gauge symmetry, thus explaining the smallness of neutrino masses by a suppression ($1/\Lambda$), where $\Lambda$ is a heavy New Physics scale. This leads to the violation of Lepton Number (L), which can be probed by current and future experiments. On the other hand, in the quark sector, experimental measurements of B-meson decays have shown some tensions with the SM predictions involving both rare flavour-changing neutral currents and tree-level semileptonic decays. Although these tensions have been alleviated, new physics may also be needed to explain some discrepancies in this sector. Interestingly enough, leptoquarks (LQ) hypothetical colored states that can transform quarks into leptons (and vice-versa) may play a role in both sectors. Majorana-type neutrino masses can be generated at the one-loop level if we introduce two particular scalar LQ multiplets: a scalar leptoquark $S_1$ (or $S_3$) with fermion number F = -2 and a scalar $F=0$ leptoquark $\tilde{R}_2$. These same LQ pair combinations can generate contributions to neutrinoless double-beta decay, a process being investigated by several current experiments with increasing sensitivity. In this context, we propose to investigate the interplay between neutrino masses, LHC flavor limits, flavor anomalies (if they remain), other lepton number violating observables and neutrinoless double-beta decay limits in these and other types of leptoquark models. (AU)

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