Signatures of heavy Majorana neutrinos and HERA's isolated lepton events

Abstract

The graph of neutrinoless double beta decay is applied to HERA and generalized to final states with any two charged leptons. Considered is the case in which one of the two escapes typical identification criteria and the case when a produced tau decays hadronically. Both possibilities give one isolated lepton with high transverse momentum, hadronic activity and an imbalance in transverse momentum. We examine the kinematical properties of these events and compare them with the high p_T isolated leptons reported by the H1 collaboration. Their positive charged muon events can be explained by the ``double beta'' process and we discuss possibilities for the precise determination which original final state produced the single isolated lepton. To confirm our hypothesis one should search in the data for high pseudorapidity and/or low p_T leptons or for additional separated jets.

19 pages with 14 figures, minor changes

References in corpus (6)

• Bounds on effective Majorana neutrino masses at HERA
• New limits on effective Majorana neutrino masses from rare kaon decays
• Neutrino oscillation experiments and limits on lepton-number and lepton-flavor violating processes
• W Production and the Search for Events with an Isolated High-Energy Lepton and Missing Transverse Momentum at HERA
• Heavy Majorana neutrino production at electron-muon colliders
• Search for Heavy Neutral and Charged Leptons in e${}^{+}$e${}^{-}$ Annihilation at $\sqrt{s}$ = 183 and 189 GeV

Cited by in corpus (7)

• Cancellations in Neutrinoless Double Beta Decay and the Neutrino Mass Matrix
• On Lepton Flavor Violation in Tau Decays
• Gauge and Scheme Dependence of Mixing Matrix Renormalization
• Isolated electrons and muons in events with missing transverse momentum at HERA
• Double seesaw mechanism in a left-right symmetric model with TeV neutrinos
• On-shell renormalization of the mixing matrices in Majorana neutrino theories
• "Neutrinoless Double Beta Decay" at a Neutrino Factory