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Title: Long-lived TeV-scale right-handed neutrino production at the LHC in gauged U(1) X 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:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]
  1. Osaka Univ., Osaka (Japan)
  2. Washington Univ., St. Louis, MO (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  3. Univ. of Alabama, Tuscaloosa, AL (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
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; oai:inspirehep.net:1738966
Grant/Contract Number:  
AC02-07CH11359; SC0017987; SC0012447
Resource Type:
Published Article
Journal Name:
Physics Letters B
Additional Journal Information:
Journal Volume: 799; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Country of Publication:
United States
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)X model. United States: 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)X model. United States. doi:10.1016/j.physletb.2019.135052.
Das, Arindam, Dev, P. S. Bhupal, and Okada, Nobuchika. Wed . "Long-lived TeV-scale right-handed neutrino production at the LHC in gauged U(1)X model". United States. doi: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)X 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 = {United States},
year = {2019},
month = {10}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1016/j.physletb.2019.135052

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