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

arXiv

2203.06114

Date

2022-03-11

Frontier

Theory Frontier (TF)

Topical groups

• TF7
• EF9

Submitted by

Rojalin Padhan

Abstract

We investigate the pair-production of Right-Handed Neutrinos (RHNs) via a $B-L$ $Z^{\prime }$ boson and the detection prospects at the High-Luminosity run of the LHC (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 active-sterile mixing strengths. Being produced through a mass resonance with $m_{Z^{\prime }}\ge 1$ 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-LHC and FCC-hh can be sensitive to small active-sterile mixing $V_{\mu N}>{10}^{-6}$ and $V_{\mu N}>{10}^{-7}$ with the number of events reaching $\mathcal{O}(10)$ and $\mathcal{O}({10}^3)$, respectively. This allows probing the generation of light neutrino masses through the Seesaw mechanism in this scenario.