Search for an LSP gluino at LEP with the DELPHI detector
In some supersymmetric models, the gluino (g̃) is predicted to be light and stable. In that case, it would hadronize to form R-hadrons. In these models, the missing energy signature of the lightest supersymmetric particle is no longer valid, even if R-parity is conserved. Therefore, such a gluino is...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
2003
|
| _version_ | 1826295652230889472 |
|---|---|
| author | Abdallah, J Abreu, P Adam, W Adzic, P Albrecht, T Alderweireld, T Alemany-Fernandez, R Allmendinger, T Allport, P Amaldi, U Amapane, N Amato, S Anashkin, E Andreazza, A Andringa, S Anjos, N Antilogus, P Apel, W Arnoud, Y Ask, S Asman, B Augustin, J Augustinus, A Baillon, P Ballestrero, A |
| author_facet | Abdallah, J Abreu, P Adam, W Adzic, P Albrecht, T Alderweireld, T Alemany-Fernandez, R Allmendinger, T Allport, P Amaldi, U Amapane, N Amato, S Anashkin, E Andreazza, A Andringa, S Anjos, N Antilogus, P Apel, W Arnoud, Y Ask, S Asman, B Augustin, J Augustinus, A Baillon, P Ballestrero, A |
| author_sort | Abdallah, J |
| collection | OXFORD |
| description | In some supersymmetric models, the gluino (g̃) is predicted to be light and stable. In that case, it would hadronize to form R-hadrons. In these models, the missing energy signature of the lightest supersymmetric particle is no longer valid, even if R-parity is conserved. Therefore, such a gluino is not constrained by hadron collider results, which looked for the decay g̃ → qq̄10. Data collected by the DELPHI detector in 1994 at 91.2 GeV have been analysed to search for qq̄g̃g̃ events. No deviation from Standard Model predictions is observed and a gluino mass between 2 and 18 GeV/c2 is excluded at the 95% confidence level in these models. Then, R-hadrons produced in the squark decays were searched for in the data collected by DELPHI at the centre-of-mass energies of 189 to 208 GeV, corresponding to an overall integrated luminosity of 609 pb-1. The observed number of events is in agreement with the Standard Model predictions. Limits at 95% confidence level are derived on the squark masses from the excluded regions in the plane (mq̄1,mg̃): mt̃1 > 90 GeV/c2, and mb̃1 > 96 GeV/c2 for purely left squarks. mt̃1 > 87 GeV/c2, and mb̃1 > 82 GeV/c2 independent of the mixing angle. |
| first_indexed | 2024-03-07T04:04:20Z |
| format | Journal article |
| id | oxford-uuid:c5a273ef-e2b2-4ace-a987-dc94b947bfe5 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T04:04:20Z |
| publishDate | 2003 |
| record_format | dspace |
| spelling | oxford-uuid:c5a273ef-e2b2-4ace-a987-dc94b947bfe52022-03-27T06:32:29ZSearch for an LSP gluino at LEP with the DELPHI detectorJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:c5a273ef-e2b2-4ace-a987-dc94b947bfe5EnglishSymplectic Elements at Oxford2003Abdallah, JAbreu, PAdam, WAdzic, PAlbrecht, TAlderweireld, TAlemany-Fernandez, RAllmendinger, TAllport, PAmaldi, UAmapane, NAmato, SAnashkin, EAndreazza, AAndringa, SAnjos, NAntilogus, PApel, WArnoud, YAsk, SAsman, BAugustin, JAugustinus, ABaillon, PBallestrero, AIn some supersymmetric models, the gluino (g̃) is predicted to be light and stable. In that case, it would hadronize to form R-hadrons. In these models, the missing energy signature of the lightest supersymmetric particle is no longer valid, even if R-parity is conserved. Therefore, such a gluino is not constrained by hadron collider results, which looked for the decay g̃ → qq̄10. Data collected by the DELPHI detector in 1994 at 91.2 GeV have been analysed to search for qq̄g̃g̃ events. No deviation from Standard Model predictions is observed and a gluino mass between 2 and 18 GeV/c2 is excluded at the 95% confidence level in these models. Then, R-hadrons produced in the squark decays were searched for in the data collected by DELPHI at the centre-of-mass energies of 189 to 208 GeV, corresponding to an overall integrated luminosity of 609 pb-1. The observed number of events is in agreement with the Standard Model predictions. Limits at 95% confidence level are derived on the squark masses from the excluded regions in the plane (mq̄1,mg̃): mt̃1 > 90 GeV/c2, and mb̃1 > 96 GeV/c2 for purely left squarks. mt̃1 > 87 GeV/c2, and mb̃1 > 82 GeV/c2 independent of the mixing angle. |
| spellingShingle | Abdallah, J Abreu, P Adam, W Adzic, P Albrecht, T Alderweireld, T Alemany-Fernandez, R Allmendinger, T Allport, P Amaldi, U Amapane, N Amato, S Anashkin, E Andreazza, A Andringa, S Anjos, N Antilogus, P Apel, W Arnoud, Y Ask, S Asman, B Augustin, J Augustinus, A Baillon, P Ballestrero, A Search for an LSP gluino at LEP with the DELPHI detector |
| title | Search for an LSP gluino at LEP with the DELPHI detector |
| title_full | Search for an LSP gluino at LEP with the DELPHI detector |
| title_fullStr | Search for an LSP gluino at LEP with the DELPHI detector |
| title_full_unstemmed | Search for an LSP gluino at LEP with the DELPHI detector |
| title_short | Search for an LSP gluino at LEP with the DELPHI detector |
| title_sort | search for an lsp gluino at lep with the delphi detector |
| work_keys_str_mv | AT abdallahj searchforanlspgluinoatlepwiththedelphidetector AT abreup searchforanlspgluinoatlepwiththedelphidetector AT adamw searchforanlspgluinoatlepwiththedelphidetector AT adzicp searchforanlspgluinoatlepwiththedelphidetector AT albrechtt searchforanlspgluinoatlepwiththedelphidetector AT alderweireldt searchforanlspgluinoatlepwiththedelphidetector AT alemanyfernandezr searchforanlspgluinoatlepwiththedelphidetector AT allmendingert searchforanlspgluinoatlepwiththedelphidetector AT allportp searchforanlspgluinoatlepwiththedelphidetector AT amaldiu searchforanlspgluinoatlepwiththedelphidetector AT amapanen searchforanlspgluinoatlepwiththedelphidetector AT amatos searchforanlspgluinoatlepwiththedelphidetector AT anashkine searchforanlspgluinoatlepwiththedelphidetector AT andreazzaa searchforanlspgluinoatlepwiththedelphidetector AT andringas searchforanlspgluinoatlepwiththedelphidetector AT anjosn searchforanlspgluinoatlepwiththedelphidetector AT antilogusp searchforanlspgluinoatlepwiththedelphidetector AT apelw searchforanlspgluinoatlepwiththedelphidetector AT arnoudy searchforanlspgluinoatlepwiththedelphidetector AT asks searchforanlspgluinoatlepwiththedelphidetector AT asmanb searchforanlspgluinoatlepwiththedelphidetector AT augustinj searchforanlspgluinoatlepwiththedelphidetector AT augustinusa searchforanlspgluinoatlepwiththedelphidetector AT baillonp searchforanlspgluinoatlepwiththedelphidetector AT ballestreroa searchforanlspgluinoatlepwiththedelphidetector |