LongLived TeVScale RightHanded 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 righthanded neutrinos (RHNs) for generating the observed light neutrino masses and mixing by the typeI 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 pairproduction under these constraints. Finally, we investigate the possibility of having one of the RHNs longlived, even for a TeVscale 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 longlived with a displacedvertex signature which can be searched for at the LHC and/or with a dedicated longlived particle detector, such as MATHUSLA. In other words, once a longlived RHN is observed, we can set an upper bound on the lightest neutrino mass in this model.
 Authors:

 Osaka U.
 Fermilab
 Alabama U.
 Publication Date:
 Research Org.:
 Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC), High Energy Physics (HEP) (SC25)
 OSTI Identifier:
 1546016
 Report Number(s):
 arXiv:1906.04132; FERMILABPUB19268T
1738966
 DOE Contract Number:
 AC0207CH11359
 Resource Type:
 Journal Article
 Journal Name:
 TBD
 Additional Journal Information:
 Journal Name: TBD
 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. LongLived TeVScale RightHanded Neutrino Production at the LHC in Gauged $U(1)_X$ Model. United States: N. p., 2019.
Web.
Das, Arindam, Dev, P.S. Bhupal, & Okada, Nobuchika. LongLived TeVScale RightHanded Neutrino Production at the LHC in Gauged $U(1)_X$ Model. United States.
Das, Arindam, Dev, P.S. Bhupal, and Okada, Nobuchika. Mon .
"LongLived TeVScale RightHanded Neutrino Production at the LHC in Gauged $U(1)_X$ Model". United States. https://www.osti.gov/servlets/purl/1546016.
@article{osti_1546016,
title = {LongLived TeVScale RightHanded 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 righthanded neutrinos (RHNs) for generating the observed light neutrino masses and mixing by the typeI 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 pairproduction under these constraints. Finally, we investigate the possibility of having one of the RHNs longlived, even for a TeVscale 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 longlived with a displacedvertex signature which can be searched for at the LHC and/or with a dedicated longlived particle detector, such as MATHUSLA. In other words, once a longlived RHN is observed, we can set an upper bound on the lightest neutrino mass in this model.},
doi = {},
journal = {TBD},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {6}
}