Isolated tau leptons in events with large missing transverse momentum at HERA

Abstract

A search for events containing isolated tau leptons and large missing transverse momentum, not originating from the tau decay, has been performed with the ZEUS detector at the electron-proton collider HERA, using 130 pb^-1 of integrated luminosity. A search was made for isolated tracks coming from hadronic tau decays. Observables based on the internal jet structure were exploited to discriminate between tau decays and quark- or gluon-induced jets. Three tau candidates were found, while 0.40 +0.12 -0.13 were expected from Standard Model processes, such as charged current deep inelastic scattering and single W-boson production. To search for heavy-particle decays, a more restrictive selection was applied to isolate tau leptons produced together with a hadronic final state with high transverse momentum. Two candidate events survive, while 0.20 +-0.05 events are expected from Standard Model processes.

28 pages, 4 figures, 3 tables, accepted by Phys. Lett. B. Updated with minor changes to the text requested by the journal referee

References in corpus (4)

• Search for single-top production in ep collisions at HERA
• Isolated electrons and muons in events with missing transverse momentum at HERA
• Measurement of subjet multiplicities in neutral current deep inelastic scattering at HERA and determination of ${\alpha }_s$
• A Multi-variate Discrimination Technique Based on Range-Searching

Cited by in corpus (10)

• Collider Physics at HERA
• Search for lepton-flavor violation at HERA
• Events with Isolated Leptons and Missing Transverse Momentum and Measurement of W Production at HERA
• Search for events with an isolated lepton and missing transverse momentum and a measurement of W production at HERA
• Tau Lepton Production in ep Collisions at HERA
• High Energy Photoproduction
• Review of Searches for Rare Processes and Physics Beyond the Standard Model at HERA
• PDE-Foam - a probability-density estimation method using self-adapting phase-space binning
• Study of tau-pair production at HERA
• Isolated Lepton Production at Colliders