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Hyperon decays and QCD
In an experiment in the CERN Super Proton Synchrotron (SPS) charged hyperon beam, 2400 Omega /sup -/ decays have been collected. The analysis of the Omega /sup -/ sample has given an accurate measurement of the Omega /sup -/ lifetime ( tau ( Omega /sup -/)=(0.822+or-0.028) *10/sup -10/ s) and the fi...
| Autores principales: | , , , , , |
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| Lenguaje: | eng |
| Publicado: |
1980
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| Materias: | |
| Acceso en línea: | http://cds.cern.ch/record/879249 |
| _version_ | 1780908062870077440 |
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| author | Gaillard, J M Basdevant, J L Gastmans, Raymond Jacob, Maurice René Michel Speiser, D Weyers, J |
| author_facet | Gaillard, J M Basdevant, J L Gastmans, Raymond Jacob, Maurice René Michel Speiser, D Weyers, J |
| author_sort | Gaillard, J M |
| collection | CERN |
| description | In an experiment in the CERN Super Proton Synchrotron (SPS) charged hyperon beam, 2400 Omega /sup -/ decays have been collected. The analysis of the Omega /sup -/ sample has given an accurate measurement of the Omega /sup -/ lifetime ( tau ( Omega /sup -/)=(0.822+or-0.028) *10/sup -10/ s) and the first determination of the Omega /sup -/ decay branching ratios. In particular the measured ratio Gamma ( Omega /sup -/ to Xi /sup 0/ pi /sup -/)/ Gamma ( Omega /sup -/ to Xi /sup -/ pi /sup 0/) is 2.94+or-0.35, while a pure Delta I=1/2 amplitude would have given 2.03. A ratio of about 3 between those two decay modes had in fact been predicted by Finjord using the QCD framework. The author discusses briefly what QCD has to say about hyperon decays, then describes the Omega /sup -/ experiment and the analysis results. (8 refs). |
| id | cern-879249 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 1980 |
| record_format | invenio |
| spelling | cern-8792492019-09-30T06:29:59Zhttp://cds.cern.ch/record/879249engGaillard, J MBasdevant, J LGastmans, RaymondJacob, Maurice René MichelSpeiser, DWeyers, JHyperon decays and QCDParticle Physics - PhenomenologyIn an experiment in the CERN Super Proton Synchrotron (SPS) charged hyperon beam, 2400 Omega /sup -/ decays have been collected. The analysis of the Omega /sup -/ sample has given an accurate measurement of the Omega /sup -/ lifetime ( tau ( Omega /sup -/)=(0.822+or-0.028) *10/sup -10/ s) and the first determination of the Omega /sup -/ decay branching ratios. In particular the measured ratio Gamma ( Omega /sup -/ to Xi /sup 0/ pi /sup -/)/ Gamma ( Omega /sup -/ to Xi /sup -/ pi /sup 0/) is 2.94+or-0.35, while a pure Delta I=1/2 amplitude would have given 2.03. A ratio of about 3 between those two decay modes had in fact been predicted by Finjord using the QCD framework. The author discusses briefly what QCD has to say about hyperon decays, then describes the Omega /sup -/ experiment and the analysis results. (8 refs).oai:cds.cern.ch:8792491980 |
| spellingShingle | Particle Physics - Phenomenology Gaillard, J M Basdevant, J L Gastmans, Raymond Jacob, Maurice René Michel Speiser, D Weyers, J Hyperon decays and QCD |
| title | Hyperon decays and QCD |
| title_full | Hyperon decays and QCD |
| title_fullStr | Hyperon decays and QCD |
| title_full_unstemmed | Hyperon decays and QCD |
| title_short | Hyperon decays and QCD |
| title_sort | hyperon decays and qcd |
| topic | Particle Physics - Phenomenology |
| url | http://cds.cern.ch/record/879249 |
| work_keys_str_mv | AT gaillardjm hyperondecaysandqcd AT basdevantjl hyperondecaysandqcd AT gastmansraymond hyperondecaysandqcd AT jacobmauricerenemichel hyperondecaysandqcd AT speiserd hyperondecaysandqcd AT weyersj hyperondecaysandqcd |