Long-lived TeV-scale right-handed neutrino production at the LHC in gauged U(1) model
Abstract
A gauged $$U(1)_X$$ extension of the Standard Model is a simple and consistent framework to naturally incorporate three right-handed neutrinos (RHNs) for generating the observed light neutrino masses and mixing by the type-I seesaw mechanism. We examine the collider testability of the $$U(1)_X$$ model, both in its minimal form with the conventional charges, as well as with an alternative charge assignment, via the resonant production of the $$U(1)_X$$ gauge boson ($$Z^\prime$$) and its subsequent decay into a pair of RHNs. We first derive an updated upper limit on the new gauge coupling $$g_X$$ as a function of the $Z'$-boson mass from the latest LHC dilepton searches. Then we identify the maximum possible cross section for the RHN pair-production under these constraints. Finally, we investigate the possibility of having one of the RHNs long-lived, even for a TeV-scale mass. Employing the general parametrization for the light neutrino mass matrix to reproduce the observed neutrino oscillation data, we perform a parameter scan and find a simple formula for the maximum RHN lifetime as a function of the lightest neutrino mass eigenvalue ($$m_{\rm lightest}$$). We find that for $$m_{\rm lightest}\lesssim 10^{-5}$$ eV, one of the RHNs in the minimal $$U(1)_X$$ scenario can be long-lived with a displaced-vertex signature which can be searched for at the LHC and/or with a dedicated long-lived particle detector, such as MATHUSLA. In other words, once a long-lived RHN is observed, we can set an upper bound on the lightest neutrino mass in this model.
- Authors:
- Publication Date:
- Research Org.:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1573273
- Alternate Identifier(s):
- OSTI ID: 1546016
- Report Number(s):
- arXiv:1906.04132; FERMILAB-PUB-19-268-T
Journal ID: ISSN 0370-2693; S0370269319307749; 135052; PII: S0370269319307749
- Grant/Contract Number:
- AC02-07CH11359
- Resource Type:
- Published Article
- Journal Name:
- Physics Letters. B
- Additional Journal Information:
- Journal Name: Physics Letters. B Journal Volume: 799 Journal Issue: C; Journal ID: ISSN 0370-2693
- Publisher:
- Elsevier
- Country of Publication:
- Netherlands
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
Citation Formats
Das, Arindam, Dev, P. S. Bhupal, and Okada, Nobuchika. Long-lived TeV-scale right-handed neutrino production at the LHC in gauged U(1) model. Netherlands: N. p., 2019.
Web. doi:10.1016/j.physletb.2019.135052.
Das, Arindam, Dev, P. S. Bhupal, & Okada, Nobuchika. Long-lived TeV-scale right-handed neutrino production at the LHC in gauged U(1) model. Netherlands. https://doi.org/10.1016/j.physletb.2019.135052
Das, Arindam, Dev, P. S. Bhupal, and Okada, Nobuchika. Sun .
"Long-lived TeV-scale right-handed neutrino production at the LHC in gauged U(1) model". Netherlands. https://doi.org/10.1016/j.physletb.2019.135052.
@article{osti_1573273,
title = {Long-lived TeV-scale right-handed neutrino production at the LHC in gauged U(1) model},
author = {Das, Arindam and Dev, P. S. Bhupal and Okada, Nobuchika},
abstractNote = {A gauged $U(1)_X$ extension of the Standard Model is a simple and consistent framework to naturally incorporate three right-handed neutrinos (RHNs) for generating the observed light neutrino masses and mixing by the type-I seesaw mechanism. We examine the collider testability of the $U(1)_X$ model, both in its minimal form with the conventional charges, as well as with an alternative charge assignment, via the resonant production of the $U(1)_X$ gauge boson ($Z^\prime$) and its subsequent decay into a pair of RHNs. We first derive an updated upper limit on the new gauge coupling $g_X$ as a function of the $Z'$-boson mass from the latest LHC dilepton searches. Then we identify the maximum possible cross section for the RHN pair-production under these constraints. Finally, we investigate the possibility of having one of the RHNs long-lived, even for a TeV-scale mass. Employing the general parametrization for the light neutrino mass matrix to reproduce the observed neutrino oscillation data, we perform a parameter scan and find a simple formula for the maximum RHN lifetime as a function of the lightest neutrino mass eigenvalue ($m_{\rm lightest}$). We find that for $m_{\rm lightest}\lesssim 10^{-5}$ eV, one of the RHNs in the minimal $U(1)_X$ scenario can be long-lived with a displaced-vertex signature which can be searched for at the LHC and/or with a dedicated long-lived particle detector, such as MATHUSLA. In other words, once a long-lived RHN is observed, we can set an upper bound on the lightest neutrino mass in this model.},
doi = {10.1016/j.physletb.2019.135052},
journal = {Physics Letters. B},
number = C,
volume = 799,
place = {Netherlands},
year = {Sun Dec 01 00:00:00 EST 2019},
month = {Sun Dec 01 00:00:00 EST 2019}
}
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