Displaced fat-jets and tracks to probe boosted right-handed neutrinos in the U(1)B-L model

We investigate the pair-production of Right Handed Neutrinos (RHNs) via a B L Z' boson and present the sensitivity studies of the active -sterile neutrino mixing (I Vt NI) at the High -Luminosity run of the LIIC (HL-LHC) and a future pp collider (FCC-hh). We focus on RHN states with a mass of 10 70 GeV which naturally results in displaced vertices for small 1Vt,NI. Being produced through a mass resonance with Mz, > 1 TeV, the RHNs are heavily boosted, leading to collimated decay products that give rise to fat -jets. We investigate the detection prospect of dedicated signatures in the inner detector and the muon spectrometer, namely a pair of displaced fat -jets and the associated tracks, respectively. We find that both the HL-LIIC and FCC-hh can be sensitive to 1VoN1 > 10-6 and 1VoN1 > 10-7 with the number of events reaching 0(10) and 0(103), respectively. This allows probing the generation of light neutrino masses through the Seesaw mechanism.

Automated summary

We investigate the sensitivity of the active-sterile neutrino mixing at high-luminosity run of LIIC (HL-LHC) and a future pp collider (FCC-hh) via the pair-production of Right Handed Neutrinos (RHNs) mediated by a B L Z' boson. We find that both HL-LIIC and FCC-hh can be sensitive to certain mixing parameters, allowing for the detection of displaced fat-jets and associated tracks. This provides a way to probe the generation of light neutrino masses through the Seesaw mechanism.