Direct Estimate of the Gluon Polarization in the Nucleon

We make a first crude direct estimate of the net gluon polarization in the proton, DeltaG, combining data on the asymmetries in high-p_T hadron production from the HERMES, SMC and COMPASS collaborations. Although these data sample a restricted range of x, they provide no hint that DeltaG is large. F...

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Detalles Bibliográficos
Autores principales: Ellis, John R., Karliner, Marek
Lenguaje:eng
Publicado: 2005
Materias:
Particle Physics - Phenomenology
Acceso en línea:https://dx.doi.org/10.1142/S0217732306019761
http://cds.cern.ch/record/815341
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author Ellis, John R.
Karliner, Marek
author_facet Ellis, John R.
Karliner, Marek
author_sort Ellis, John R.
collection CERN
description We make a first crude direct estimate of the net gluon polarization in the proton, DeltaG, combining data on the asymmetries in high-p_T hadron production from the HERMES, SMC and COMPASS collaborations. Although these data sample a restricted range of x, they provide no hint that DeltaG is large. Fixing the normalizations of different theoretical parametrizations using the hadron asymmetry data, we find typical central values of DeltaG \sim 0.5, with uncertainties of similar magnitude. Values of DeltaG \ge 2 are disfavoured by Delta chi^2 \sim 4 to 9, depending on the parametrization used.
id cern-815341
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2005
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spelling cern-8153412023-03-14T17:15:34Zdoi:10.1142/S0217732306019761http://cds.cern.ch/record/815341engEllis, John R.Karliner, MarekDirect Estimate of the Gluon Polarization in the NucleonParticle Physics - PhenomenologyWe make a first crude direct estimate of the net gluon polarization in the proton, DeltaG, combining data on the asymmetries in high-p_T hadron production from the HERMES, SMC and COMPASS collaborations. Although these data sample a restricted range of x, they provide no hint that DeltaG is large. Fixing the normalizations of different theoretical parametrizations using the hadron asymmetry data, we find typical central values of DeltaG \sim 0.5, with uncertainties of similar magnitude. Values of DeltaG \ge 2 are disfavoured by Delta chi^2 \sim 4 to 9, depending on the parametrization used.We make a first crude direct estimate of the net gluon polarization in the proton, DeltaG, combining data on the asymmetries in high-p_T hadron production from the HERMES, SMC and COMPASS collaborations. Although these data sample a restricted range of x, they provide no hint that DeltaG is large. Fixing the normalizations of different theoretical parametrizations using the hadron asymmetry data, we find typical central values of DeltaG \sim 0.5, with uncertainties of similar magnitude. Values of DeltaG \ge 2 are disfavoured by Delta chi^2 \sim 9 to 20, depending on the parametrization used.hep-ph/0501115CERN-PH-TH-2005-001TAUP-2792-05CAVENDISH-HEP-05-02CAVENDISH-HEP-2005-02CERN-PH-TH-2005-001TAUP-2792oai:cds.cern.ch:8153412005-01-13
spellingShingle Particle Physics - Phenomenology
Ellis, John R.
Karliner, Marek
Direct Estimate of the Gluon Polarization in the Nucleon
title Direct Estimate of the Gluon Polarization in the Nucleon
title_full Direct Estimate of the Gluon Polarization in the Nucleon
title_fullStr Direct Estimate of the Gluon Polarization in the Nucleon
title_full_unstemmed Direct Estimate of the Gluon Polarization in the Nucleon
title_short Direct Estimate of the Gluon Polarization in the Nucleon
title_sort direct estimate of the gluon polarization in the nucleon
topic Particle Physics - Phenomenology
url https://dx.doi.org/10.1142/S0217732306019761
http://cds.cern.ch/record/815341
work_keys_str_mv AT ellisjohnr directestimateofthegluonpolarizationinthenucleon
AT karlinermarek directestimateofthegluonpolarizationinthenucleon

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