Abstract
Abstract
Heavy neutral leptons (HNLs) with masses around the electroweak scale are expected to be rather long-lived particles, as a result of the observed smallness of the active neutrino masses. In this work, we study long-lived HNLs in NRSMEFT, a Standard Model (SM) extension with singlet fermions to which we add non-renormalizable operators up to dimension-6. Operators which contain two HNLs can lead to a sizable enhancement of the production cross sections, compared to the minimal case where HNLs are produced only via their mixing with the SM neutrinos. We calculate the expected sensitivities for the ATLAS detector and the future far-detector experiments: AL3X, ANUBIS, CODEX-b, FASER, MATHUSLA, and MoEDAL-MAPP in this setup. The sensitive ranges of the HNL mass and of the active-heavy mixing angle are much larger than those in the minimal case. We study both, Dirac and Majorana, HNLs and discuss how the two cases actually differ phenomenologically, for HNL masses above roughly 100 GeV.
Publisher
Springer Science and Business Media LLC
Subject
Nuclear and High Energy Physics
Reference130 articles.
1. J. Alimena et al., Searching for long-lived particles beyond the Standard Model at the Large Hadron Collider, J. Phys. G 47 (2020) 090501 [arXiv:1903.04497] [INSPIRE].
2. L. Lee, C. Ohm, A. Soffer and T.-T. Yu, Collider Searches for Long-Lived Particles Beyond the Standard Model, Prog. Part. Nucl. Phys. 106 (2019) 210 [arXiv:1810.12602] [INSPIRE].
3. D. Curtin et al., Long-Lived Particles at the Energy Frontier: The MATHUSLA Physics Case, Rept. Prog. Phys. 82 (2019) 116201 [arXiv:1806.07396] [INSPIRE].
4. ATLAS collaboration, Search for long-lived charginos based on a disappearing-track signature in pp collisions at $$ \sqrt{s} $$ = 13 TeV with the ATLAS detector, JHEP 06 (2018) 022 [arXiv:1712.02118] [INSPIRE].
5. CMS collaboration, Search for disappearing tracks as a signature of new long-lived particles in proton-proton collisions at $$ \sqrt{s} $$ = 13 TeV, JHEP 08 (2018) 016 [arXiv:1804.07321] [INSPIRE].
Cited by
29 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献