Pinning down the leptophobic $Z^{\prime }$ in leptonic final states with Deep Learning

Abstract

A leptophobic $Z^{\prime }$ that does not couple with the Standard Model leptons can evade the stringent bounds from the dilepton-resonance searches. In our earlier paper [T. Arun et al., Search for the $Z^{\prime }$ boson decaying to a right-handed neutrino pair in leptophobic $U(1)$ models, Phys. Rev. D, 106 (2022) 095035; arXiv:2204.02949], we presented two gauge anomaly-free $U(1)$ models -- one based on the Green-Schwarz (GS) anomaly cancellation mechanism, and the other on a grand unified theory (GUT) framework with gauge kinetic mixing -- where a heavy leptophobic $Z^{\prime }$ is present along with right-handed neutrinos ($N_R$). We pointed out the interesting possibility of a correlated search for $Z^{\prime }$ and $N_R$ at the LHC through the $pp\to Z^{\prime }\to N_R{N}_R$ channel. This channel can probe a part of the $Z^{\prime }$ parameter space beyond the reach of the standard dijet resonance searches. In this follow-up paper, we analyse the challenging monolepton final state arising from the decays of the $N_R$ pair with Deep Learning. We present the high-luminosity LHC discovery reaches for six different GUT embeddings and a benchmark point in the GS setup. We also update our previous estimates in the dilepton channel with Deep Learning. We identify parameter regions that can be probed with the proposed channel but will remain inaccessible to dijet searches at the HL-LHC.

13 pages, 8 figures, 5 tables. Matches the published version

References in corpus (11)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• An Introduction to PYTHIA 8.2
• Heavy Majorana Neutrinos in the Effective Lagrangian Description: Application to Hadron Colliders
• Search for high-mass diphoton resonances in proton-proton collisions at 13 TeV and combination with 8 TeV search
• Neutrino Jets from High-Mass $W_R$ Gauge Bosons in TeV-Scale Left-Right Symmetric Models
• Minimal Anomalous U(1)' Extension of the MSSM
• Phenomenological Consequences of sub-leading Terms in See-Saw Formulas
• Heavy Majorana neutrino pair production from $Z^{\prime }$ at hadron and lepton colliders
• Re-examining $N_R$-EFT Upto Dimension Six
• Right-handed neutrino pair production via second-generation leptoquarks
• Search for the $Z^{\prime }$ boson decaying to a right-handed neutrino pair in leptophobic $\mathrm{U}(1)$ models

Cited by in corpus (1)

• Anomalous $U(1)$ extension of the Standard Model