Heavy Neutral Lepton Search and μ → eγ Constraints in Case of Type-I Seesaw-Reference-Cited by-同舟云学术

Heavy Neutral Lepton Search and μ → eγ Constraints in Case of Type-I Seesaw

Published:2024-07-04 Issue:7 Volume:16 Page:843
ISSN:2073-8994
Container-title:Symmetry
language:en
Short-container-title:Symmetry

Author:

Morisi Stefano¹²

Affiliation:

1. Dipartimento di Fisica “Ettore Pancini”, Università degli Studi di Napoli “Federico II”, Complesso University Monte S. Angelo, I-80126 Napoli, Italy

2. INFN—Sezione di Napoli, Complesso University Monte S. Angelo, I-80126 Napoli, Italy

Abstract

Within the type-I seesaw mechanism, it is possible to have large (order one) light–heavy neutrino mixing even in the case of low right-handed neutrino mass scale (of the order of GeV). This implies large lepton flavor violation. As an example, we consider the process μ→eγ that can have a branching of up to 10−8 within type-I seesaw (in contrast with the tiny value 10−54 expected). Such an enhancement of lepton flavor violation can be used to constraint the parameter space of long-lived particle experiments.

Funder

Istituto Nazionale di Fisica Nucleare

Publisher

MDPI AG

Link

https://www.mdpi.com/2073-8994/16/7/843/pdf

Reference38 articles.

1. Bauer, M., Brandt, O., Lee, L., and Ohm, C. (2019). ANUBIS: Proposal to search for long-lived neutral particles in CERN service shafts. arXiv.

2. Shah, A. (2024). Searches for long-lived particles with the ANUBIS experiment. arXiv.

3. Long-Lived Particles at the Energy Frontier: The MATHUSLA Physics Case;Curtin;Rept. Prog. Phys.,2019

4. Baldini, W., Balla, A., Bernhard, J., Calcaterra, A., Cafaro, V., Ceccucci, A., Cicero, V., Ciambrone, P., Danielsson, H., and D’Alessandro, G. (2021). SHADOWS (Search for Hidden and Dark Objects with the SPS). arXiv.

5. The Beam and detector of the NA62 experiment at CERN;Gil;J. Instrum.,2017