Weak isosinglet Neutral Heavy Leptons (νm) have been searched for using data collected by the DELPHI detector corresponding to 3.3 × 106hadronic Z0decays at LEP1. Four separate searches have been performed, for short-lived νmproduction giving monojet or acollinear jet topologies, and for long-lived νmgiving detectable secondary vertices or calorimeter clusters. No indication of the existence of these particles has been found, leading to an upper limit for the branching ratio BR(Z0→ νmν̄) of about 1.3 × 10-6at 95% confidence level for νmmasses between 3.5 and 50 GeV/c2. Outside this range the limit weakens rapidly with the νmmass. The results are also interpreted in terms of limits for the single production of excited neutrinos. © Springer-Verlag 1997

Abreu, P., Adam, W., Adye, T., Ajinenko, I., Alekseev, G., Alemany, R., et al. (1997). Search for neutral heavy leptons produced in Z decays. ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS, 74(1), 57-71 [10.1007/s002880050370].

Search for neutral heavy leptons produced in Z decays

Calvi, M.;Paganoni, M.;Ragazzi, S.;Tabarelli, T.;
1997

Abstract

Weak isosinglet Neutral Heavy Leptons (νm) have been searched for using data collected by the DELPHI detector corresponding to 3.3 × 106hadronic Z0decays at LEP1. Four separate searches have been performed, for short-lived νmproduction giving monojet or acollinear jet topologies, and for long-lived νmgiving detectable secondary vertices or calorimeter clusters. No indication of the existence of these particles has been found, leading to an upper limit for the branching ratio BR(Z0→ νmν̄) of about 1.3 × 10-6at 95% confidence level for νmmasses between 3.5 and 50 GeV/c2. Outside this range the limit weakens rapidly with the νmmass. The results are also interpreted in terms of limits for the single production of excited neutrinos. © Springer-Verlag 1997
Articolo in rivista - Articolo scientifico
Physics and Astronomy (miscellaneous)
English
1997
74
1
57
71
none
Abreu, P., Adam, W., Adye, T., Ajinenko, I., Alekseev, G., Alemany, R., et al. (1997). Search for neutral heavy leptons produced in Z decays. ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS, 74(1), 57-71 [10.1007/s002880050370].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/187007
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