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Spin alignment in heavy and light flavour systems at OPAL

Spin alignment of inclusive vector mesons and longitudinal polarization of Lambda hyperons have been measured in a sample of 4.3 million hadronic Z/sup 0/ decays from the OPAL detector at LEP. Leading, light vector mesons have been $9 found to populate preferentially the helicity-zero state, a resul...

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Autor principal: Robins, Simon
Lenguaje:eng
Publicado: 1999
Materias:
Acceso en línea:https://dx.doi.org/10.1016/S0920-5632(99)00357-6
http://cds.cern.ch/record/409803
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author Robins, Simon
author_facet Robins, Simon
author_sort Robins, Simon
collection CERN
description Spin alignment of inclusive vector mesons and longitudinal polarization of Lambda hyperons have been measured in a sample of 4.3 million hadronic Z/sup 0/ decays from the OPAL detector at LEP. Leading, light vector mesons have been $9 found to populate preferentially the helicity-zero state, a result which has no firm theoretical explanation. The values of off-diagonal elements of the helicity density matrix are in agreement with a theory based on the Standard $9 Model with coherent fragmentation. The longitudinal polarization of the Lambda is well described by a model in which the constituent strange quark carries all of the hyperon spin.
id cern-409803
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 1999
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spelling cern-4098032019-09-30T06:29:59Zdoi:10.1016/S0920-5632(99)00357-6http://cds.cern.ch/record/409803engRobins, SimonSpin alignment in heavy and light flavour systems at OPALParticle Physics - ExperimentSpin alignment of inclusive vector mesons and longitudinal polarization of Lambda hyperons have been measured in a sample of 4.3 million hadronic Z/sup 0/ decays from the OPAL detector at LEP. Leading, light vector mesons have been $9 found to populate preferentially the helicity-zero state, a result which has no firm theoretical explanation. The values of off-diagonal elements of the helicity density matrix are in agreement with a theory based on the Standard $9 Model with coherent fragmentation. The longitudinal polarization of the Lambda is well described by a model in which the constituent strange quark carries all of the hyperon spin.oai:cds.cern.ch:4098031999
spellingShingle Particle Physics - Experiment
Robins, Simon
Spin alignment in heavy and light flavour systems at OPAL
title Spin alignment in heavy and light flavour systems at OPAL
title_full Spin alignment in heavy and light flavour systems at OPAL
title_fullStr Spin alignment in heavy and light flavour systems at OPAL
title_full_unstemmed Spin alignment in heavy and light flavour systems at OPAL
title_short Spin alignment in heavy and light flavour systems at OPAL
title_sort spin alignment in heavy and light flavour systems at opal
topic Particle Physics - Experiment
url https://dx.doi.org/10.1016/S0920-5632(99)00357-6
http://cds.cern.ch/record/409803
work_keys_str_mv AT robinssimon spinalignmentinheavyandlightflavoursystemsatopal