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Gluon Polarisation Measurements at COMPASS

One of the missing keys in the present understanding of the spin structure of the nucleon is the contribution from the gluons: the so-called gluon polarisation. This quantity can be determined in DIS through the photon-gluon fusion process, in which two analysis methods may be used: (i) identifying...

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Autor principal: Silva, Luis
Lenguaje:eng
Publicado: 2011
Materias:
Acceso en línea:https://dx.doi.org/10.1088/0031-8949/2012/T150/014037
http://cds.cern.ch/record/1395806
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author Silva, Luis
author_facet Silva, Luis
author_sort Silva, Luis
collection CERN
description One of the missing keys in the present understanding of the spin structure of the nucleon is the contribution from the gluons: the so-called gluon polarisation. This quantity can be determined in DIS through the photon-gluon fusion process, in which two analysis methods may be used: (i) identifying open charm events or (ii) selecting events with high $p_{T}$ hadrons. The data used in the present work were collected in the COMPASS experiment, where a 160 GeV/c naturally polarised muon beam, impinging on a polarised nucleon fixed target is used. Preliminary results for the gluon polarisation from high $p_{T}$ and open charm analyses are presented. The gluon polarisation result for high $p_{T}$ hadrons is divided, for the first time, into three statistically independent measurements at LO. The result from open charm analysis is obtained at LO and NLO. In both analyses a new weighted method based on a neural network approach is used.
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institution Organización Europea para la Investigación Nuclear
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spelling cern-13958062023-03-14T18:04:22Zdoi:10.1088/0031-8949/2012/T150/014037http://cds.cern.ch/record/1395806engSilva, LuisGluon Polarisation Measurements at COMPASSParticle Physics - ExperimentOne of the missing keys in the present understanding of the spin structure of the nucleon is the contribution from the gluons: the so-called gluon polarisation. This quantity can be determined in DIS through the photon-gluon fusion process, in which two analysis methods may be used: (i) identifying open charm events or (ii) selecting events with high $p_{T}$ hadrons. The data used in the present work were collected in the COMPASS experiment, where a 160 GeV/c naturally polarised muon beam, impinging on a polarised nucleon fixed target is used. Preliminary results for the gluon polarisation from high $p_{T}$ and open charm analyses are presented. The gluon polarisation result for high $p_{T}$ hadrons is divided, for the first time, into three statistically independent measurements at LO. The result from open charm analysis is obtained at LO and NLO. In both analyses a new weighted method based on a neural network approach is used.One of the missing keys in the present understanding of the spin structure of the nucleon is the contribution from the gluons: the so-called gluon polarisation. This quantity can be determined in DIS through the photon-gluon fusion process, in which two analysis methods may be used: (i) identifying open charm events or (ii) selecting events with high p_T hadrons. The data used in the present work were collected in the COMPASS experiment, where a 160 GeV/c naturally polarised muon beam, impinging on a polarised nucleon fixed target is used. Preliminary results for the gluon polarisation from high p_T and open charm analyses are presented. The gluon polarisation result for high p_T hadrons is divided, for the first time, into three statistically independent measurements at LO. The result from open charm analysis is obtained at LO and NLO. In both analyses a new weighted method based on a neural network approach is used.arXiv:1111.0561oai:cds.cern.ch:13958062011-11-03
spellingShingle Particle Physics - Experiment
Silva, Luis
Gluon Polarisation Measurements at COMPASS
title Gluon Polarisation Measurements at COMPASS
title_full Gluon Polarisation Measurements at COMPASS
title_fullStr Gluon Polarisation Measurements at COMPASS
title_full_unstemmed Gluon Polarisation Measurements at COMPASS
title_short Gluon Polarisation Measurements at COMPASS
title_sort gluon polarisation measurements at compass
topic Particle Physics - Experiment
url https://dx.doi.org/10.1088/0031-8949/2012/T150/014037
http://cds.cern.ch/record/1395806
work_keys_str_mv AT silvaluis gluonpolarisationmeasurementsatcompass