Long-lived heavy neutral leptons from mesons in effective field theory
Abstract
In the framework of the low-energy effective field theory of the Standard Model extended with heavy neutral leptons (HNLs), we calculate the production rates of HNLs from meson decays triggered by dimension-six operators. We consider both lepton-number-conserving and lepton-number-violating four-fermion operators involving either a pair of HNLs or a single HNL. Assuming that HNLs are long-lived, we perform simulations and investigate the reach of the proposed far detectors at the high-luminosity LHC to (i) active-heavy neutrino mixing and (ii) the Wilson coefficients associated with the effective operators, for HNL masses below the mass of the -meson. We further convert the latter to the associated new-physics scales. Our results show that scales in excess of hundreds of TeV and the active-heavy mixing squared as small as can be probed by these experiments.
Keywords
Cite
@article{arxiv.2210.02461,
title = {Long-lived heavy neutral leptons from mesons in effective field theory},
author = {Rebeca Beltrán and Giovanna Cottin and Juan Carlos Helo and Martin Hirsch and Arsenii Titov and Zeren Simon Wang},
journal= {arXiv preprint arXiv:2210.02461},
year = {2023}
}
Comments
Comments and references added; results unchanged; matches version accepted for publication in JHEP