Searching for a light Z′ through Higgs production at the LHC

Abstract

We investigate the potential of LHC resonance searches in leptonic final states to probe the Z in the minimal U (1) B−L model. Considering the current constraints on the Z in terms of its mass m Z and the associated gauge coupling g B−L as well as constraints in the Higgs sector, we analyse the potential of dilepton and four lepton final states for Z production. This includes Drell-Yan production, Higgs mediated decays and final state radiation processes concentrating only on the ATLAS and CMS detectors at the LHC. We show that the four-lepton final state is sensitive to m Z as low as 0.25 GeV. Furthermore, setting the Higgs mixing to sin α = 0.3, this final state has a strong sensitivity and it probes regions of parameter space where the Z is long-lived. We demonstrate the sensitivity at the High Luminosity LHC and comment on the potential of probing displaced vertices due to long-lived Z . Finally, we also comment on the strength of Z and Higgs mediated heavy neutrino processes by taking into account the constraints derived.

Low scale U(1)X gauge symmetry as an origin of dark matter, neutrino mass and flavour anomalies

“…The obtained bound depends on the assumption that the Z couples with all the charged leptons and neutrinos with the same strength, while in our case coupling strengths are not the same 4. As an example, one could see at the ref [61]. for a detail of the direct search bounds on such a light gauge boson.…”

“…This is because, in all the cases, the primary decay channels are via the production of Z which is very common in NP models with an additional U(1) X gauge bosons. The details of the collider searches for such an extension with a sub-GeV M Z can be seen from [61]. However, the search of (2 + / E T ) could be helpful to probe Toy Model I since the process is also mediated by the production and decay of the new scalars.…”

Non-standard neutrino interactions in U(1)′ model after COHERENT data

“…Dark matter phenomenology based on such symmetry has been addressed in [24][25][26][27]. Furthermore, to provide strong constraints between the mass and gauge coupling of associate gauge boson Z , a large variety of measurements have been performed, such as rare decays, anomalous magnetic moments of the electron or muon, electroweak precision tests, and direct searches at the LHC [28][29][30][31][32][33][34][35][36][37][38][39]. However, our main focus is to examine the importance of non-standard neutrino interactions within the gauge extended framework of the SM.…”

Probing new physics with long-range neutrino interactions: an effective field theory approach

“…(2 reducing the number of degrees of freedom by effectively eliminating the operators with coefficients c LR and c RR . Note that, in the Majorana case (ν R = ν c L ) both ν L and ν R will be lepton number violating (LNV) and will give rise to a number of LNV observables, which are subject to strong constraints from experiments searching for neutrinoless double beta decay, LNV meson decays and LNV collider searches [89][90][91][92][93][94][95][96][97][98][99][100][101][102][103][104][105][106].…”