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.
- Publication:
-
Physics Letters B
- Pub Date:
- March 2004
- DOI:
- 10.1016/j.physletb.2003.12.054
- arXiv:
- arXiv:hep-ex/0311028
- Bibcode:
- 2004PhLB..583...41C
- Keywords:
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- High Energy Physics - Experiment
- E-Print:
- 28 pages, 4 figures, 3 tables, accepted by Phys. Lett. B. Updated with minor changes to the text requested by the journal referee