Search for AN O(100 Gev) Mass Right-Handed Electron Neutrino at the Hera Electron-Proton Collider Using the ZEUS Detector
Abstract
We have analyzed 0.82 pb^{ -1} of e^-p and 2.89 pb^{-1} of e^+p neutral current deep inelastic scattering events produced by the HERA electron-proton collider and collected by the ZEUS detector during 1993 and 1994. A search is made for a right-handed coupling electron neutrino with mass of {cal O}(100 GeV) (N_{e}). The N _{e} is assumed to be produced via t-channel exchange of a right-handed W (W_ {R}), and would decay promptly by radiating a W_{R}. We reconstruct the two jet invariant mass to search for a mass peak corresponding to M_{W_{R}}. Similarly, we reconstruct the electron/positron plus two jet invariant mass to search for a mass peak corresponding to M_{N_{e}}. A suggestive excess of data above expected background is observed for a particular point in the (M_ {W_{R}},M_{N_ {e}}) plane, but no convincing evidence is found for the existence of a N_{e } and W_{R}. Limits are set upon M_{N_{e }}, M_{W_{R} }, and the right-handed coupling (g _{R}). With more e^ -p scattering data, nearly the entire region of M_{W_{R}} < 100 GeV and M_{W_ {R}} < M_{N_{e} } < 200 GeV can be probed to a sensitivity corresponding to g_{R} = 0.55 g_{L} (where g_ {L} is the coupling constant associated with the standard model W^+/-)..
- Publication:
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Ph.D. Thesis
- Pub Date:
- January 1995
- Bibcode:
- 1995PhDT.......123W
- Keywords:
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- W BOSON;
- Physics: Elementary Particles and High Energy