Search for neutral heavy leptons produced in Z decays
Weak isosinglet Neutral Heavy Leptons (νm) have been searched for using data collected by the DELPHI detector corresponding to 3.3 × 106 hadronic Z0 decays at LEP1. Four separate searches have been performed, for short-lived νm production giving monojet or acollinear jet topologies, and for long-liv...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
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1997
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| _version_ | 1826305954735456256 |
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| author | Abreu, P Adam, W Adye, T Ajinenko, I Alekseev, G Alemany, R Allport, P Almehed, S Amaldi, U Amato, S Andreazza, A Andrieux, M Antilogus, P Apel, W Asman, B Augustin, J Augustinus, A Baillon, P Bambade, P Barao, F Barbi, M Barbiellini, G Bardin, D Barker, G Baroncelli, A |
| author_facet | Abreu, P Adam, W Adye, T Ajinenko, I Alekseev, G Alemany, R Allport, P Almehed, S Amaldi, U Amato, S Andreazza, A Andrieux, M Antilogus, P Apel, W Asman, B Augustin, J Augustinus, A Baillon, P Bambade, P Barao, F Barbi, M Barbiellini, G Bardin, D Barker, G Baroncelli, A |
| author_sort | Abreu, P |
| collection | OXFORD |
| description | Weak isosinglet Neutral Heavy Leptons (νm) have been searched for using data collected by the DELPHI detector corresponding to 3.3 × 106 hadronic Z0 decays at LEP1. Four separate searches have been performed, for short-lived νm production giving monojet or acollinear jet topologies, and for long-lived νm giving 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 × 10-6 at 95% confidence level for νm masses between 3.5 and 50 GeV/c2. Outside this range the limit weakens rapidly with the νm mass. The results are also interpreted in terms of limits for the single production of excited neutrinos. © Springer-Verlag 1997. |
| first_indexed | 2024-03-07T06:40:38Z |
| format | Journal article |
| id | oxford-uuid:f929ac5c-e708-48a5-8ded-f6d37e5a90da |
| institution | University of Oxford |
| last_indexed | 2024-03-07T06:40:38Z |
| publishDate | 1997 |
| record_format | dspace |
| spelling | oxford-uuid:f929ac5c-e708-48a5-8ded-f6d37e5a90da2022-03-27T12:55:54ZSearch for neutral heavy leptons produced in Z decaysJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:f929ac5c-e708-48a5-8ded-f6d37e5a90daSymplectic Elements at Oxford1997Abreu, PAdam, WAdye, TAjinenko, IAlekseev, GAlemany, RAllport, PAlmehed, SAmaldi, UAmato, SAndreazza, AAndrieux, MAntilogus, PApel, WAsman, BAugustin, JAugustinus, ABaillon, PBambade, PBarao, FBarbi, MBarbiellini, GBardin, DBarker, GBaroncelli, AWeak isosinglet Neutral Heavy Leptons (νm) have been searched for using data collected by the DELPHI detector corresponding to 3.3 × 106 hadronic Z0 decays at LEP1. Four separate searches have been performed, for short-lived νm production giving monojet or acollinear jet topologies, and for long-lived νm giving 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 × 10-6 at 95% confidence level for νm masses between 3.5 and 50 GeV/c2. Outside this range the limit weakens rapidly with the νm mass. The results are also interpreted in terms of limits for the single production of excited neutrinos. © Springer-Verlag 1997. |
| spellingShingle | Abreu, P Adam, W Adye, T Ajinenko, I Alekseev, G Alemany, R Allport, P Almehed, S Amaldi, U Amato, S Andreazza, A Andrieux, M Antilogus, P Apel, W Asman, B Augustin, J Augustinus, A Baillon, P Bambade, P Barao, F Barbi, M Barbiellini, G Bardin, D Barker, G Baroncelli, A Search for neutral heavy leptons produced in Z decays |
| title | Search for neutral heavy leptons produced in Z decays |
| title_full | Search for neutral heavy leptons produced in Z decays |
| title_fullStr | Search for neutral heavy leptons produced in Z decays |
| title_full_unstemmed | Search for neutral heavy leptons produced in Z decays |
| title_short | Search for neutral heavy leptons produced in Z decays |
| title_sort | search for neutral heavy leptons produced in z decays |
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