Extra Higgs boson and Z′ as portals to signatures of heavy neutrinos at the LHC

Accomando, Elena; Rose, Luigi Delle; Moretti, Stefano; Olaiya, E.; Shepherd-Themistocleous, C. H.

doi:10.1007/jhep02(2018)109

Cited by 63 publications

(53 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The presence of the extra Z boson that couples to the quarks and the leptons also gives rise to a rich collider phenomenology in the U (1) models [20,22,[34][35][36][37]. Searches for such Z boson through it's decay dileptons have been conducted by the ATLAS and the CMS collaborations and lower limits on the Z mass has been obtained [38][39][40].…”

Section: Introductionmentioning

confidence: 99%

Constraining a general U(1)′ inverse seesaw model from vacuum stability, dark matter, and collider

et al. 2020

View full text Add to dashboard Cite

We consider a class of gauged U (1) extensions of the Standard Model (SM), where the light neutrino masses are generated by an inverse seesaw mechanism. In addition to the three right handed neutrinos, we add three singlet fermions and demand an extra Z 2 symmetry under which, the third generations of both of the neutral fermions are odd, which in turn gives us a stable dark matter candidate. We express the U (1) charges of all the fermions in terms of the U(1) charges of the standard model Higgs and the new complex scalar. We study the bounds on the parameters of the model from vacuum stability, perturbative unitarity, dark matter relic density and direct detection constraints. We also obtain the collider constraints on the Z mass and the U (1) gauge coupling. Finally we compare all the bounds on the Z mass versus the U (1) gauge coupling plane.

show abstract

Section: Introductionmentioning

confidence: 99%

Constraining a general U(1)′ inverse seesaw model from vacuum stability, dark matter, and collider

et al. 2020

View full text Add to dashboard Cite

show abstract

“…In the context of the B − L models, the prospect of discovering RHNs at the LHC has been explored in Refs. [34][35][36][37][38]. This is however limited, even at the high-luminosity phase of the LHC (HL-LHC) due to the severe constraints on the Z mass from LHC dilepton searches [39][40][41], which restrict m Z 4.5 TeV.…”

Section: Introductionmentioning

confidence: 99%

Long-lived TeV-scale right-handed neutrino production at the LHC in gauged U(1) model

2019

View full text Add to dashboard Cite

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 ) 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 lightest ). We find that for m lightest 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 longlived 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.

show abstract

“…To circumvent this problem, it was recently proposed that the discovery of RHNs may be conditioned to the existence of a new massive neutral gauge boson, Z 0 , which interacts with all fermions, including the RHNs [5][6][7]. Then it is considered that Z 0 is resonantly produced at the LHC through the process pp → Z 0 , and that subsequently it decays in a pair of RHNs, Z 0 → SS.…”

Section: Introductionmentioning

confidence: 99%

“…For the trilepton final states, a signal-tobackground ratio of S= ffiffiffi ffi B p ≃ 10 requires σðpp → Z 0 → S 3 S 3 → l AE l ∓ l AE ν l jjÞ ≃ 0.37 fb for a luminosity of 300 fb −1 with m Z 0 ¼ 4 TeV and m S 3 ¼ 400 GeV, see Ref. [7].…”

Section: Introductionmentioning

confidence: 99%

Resonant production of Z′ and signature of right-handed neutrinos within a 3-3-1 model

2018

View full text Add to dashboard Cite

Recent simulation studies indicate that right-handed neutrinos may be discovered at future high luminosity LHC runs as long as a new neutral gauge boson, Z 0 , have been discovered first. In this case, when Z 0 is resonantly produced at the LHC it, subsequently, decays into a pair of right-handed neutrinos with mass up to TeV scale. Then the decay of these neutrinos leave as signature trilepton final states and/or same-sign dimuon and a boost diboson. The prospect of discovering right-handed neutrinos through this mechanism has been developed within Abelian gauge extension of the standard model. In this work we study the processes involved in this discovery mechanism within the framework of a 3-3-1 model.

show abstract

Extra Higgs boson and Z′ as portals to signatures of heavy neutrinos at the LHC

Cited by 63 publications

References 51 publications

Constraining a general U(1)′ inverse seesaw model from vacuum stability, dark matter, and collider

Constraining a general U(1)′ inverse seesaw model from vacuum stability, dark matter, and collider

Long-lived TeV-scale right-handed neutrino production at the LHC in gauged U(1) model

Resonant production of Z′ and signature of right-handed neutrinos within a 3-3-1 model

Contact Info

Product

Resources

About