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Measurement of $A_{LL}(pT)$ for single hadron photoproduction at high $p_T$ at COMPASS
In order to understand the gluon contribution to the nucleon spin, some experiments can study the production of hadrons at high transverse momemtum from lepton-nucleon or nucleon-nucleon scattering. RHIC has recently measured such double spin asymmetries A LL ( p T ) for pion production at high cent...
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Lenguaje: | eng |
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SISSA
2014
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Acceso en línea: | https://dx.doi.org/10.22323/1.203.0223 http://cds.cern.ch/record/2025848 |
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author | Levillain, Maxime |
author_facet | Levillain, Maxime |
author_sort | Levillain, Maxime |
collection | CERN |
description | In order to understand the gluon contribution to the nucleon spin, some experiments can study the production of hadrons at high transverse momemtum from lepton-nucleon or nucleon-nucleon scattering. RHIC has recently measured such double spin asymmetries A LL ( p T ) for pion production at high center of mass energies [ 1 ] [ 2 ], and inclusion of its data to global fits based on NLO collinear pQCD calculations gives some constraints on the gluon polarization in the range 0 : 05 < x g < 0 : 2. [ 3 ] To completement these results at COMPASS range, we will present preliminary COMPASS re- sults on double longitudinal spin asymmetries A LL ( p T ) for single hadron production measured on deuteron and proton target at Q 2 < 1 ( GeV = c ) 2 , p T > 1 GeV = c and center of mass energy p s 18 GeV . All COMPASS data taken from 2002 to 2011 by scattering 160 GeV polarized muons on longitudinally polarized 6 LiD and NH 3 targets have been used, and the number of hadrons collected with p T > 1 GeV = c for this analysis amounts to about 10 millions. The obtained asymmetries will be compared to theoretical predictions of at NLO without gluon resummation calculation |
id | oai-inspirehep.net-1327122 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2014 |
publisher | SISSA |
record_format | invenio |
spelling | oai-inspirehep.net-13271222022-08-10T20:59:07Zdoi:10.22323/1.203.0223http://cds.cern.ch/record/2025848engLevillain, MaximeMeasurement of $A_{LL}(pT)$ for single hadron photoproduction at high $p_T$ at COMPASSParticle Physics - ExperimentIn order to understand the gluon contribution to the nucleon spin, some experiments can study the production of hadrons at high transverse momemtum from lepton-nucleon or nucleon-nucleon scattering. RHIC has recently measured such double spin asymmetries A LL ( p T ) for pion production at high center of mass energies [ 1 ] [ 2 ], and inclusion of its data to global fits based on NLO collinear pQCD calculations gives some constraints on the gluon polarization in the range 0 : 05 < x g < 0 : 2. [ 3 ] To completement these results at COMPASS range, we will present preliminary COMPASS re- sults on double longitudinal spin asymmetries A LL ( p T ) for single hadron production measured on deuteron and proton target at Q 2 < 1 ( GeV = c ) 2 , p T > 1 GeV = c and center of mass energy p s 18 GeV . All COMPASS data taken from 2002 to 2011 by scattering 160 GeV polarized muons on longitudinally polarized 6 LiD and NH 3 targets have been used, and the number of hadrons collected with p T > 1 GeV = c for this analysis amounts to about 10 millions. The obtained asymmetries will be compared to theoretical predictions of at NLO without gluon resummation calculationSISSAoai:inspirehep.net:13271222014 |
spellingShingle | Particle Physics - Experiment Levillain, Maxime Measurement of $A_{LL}(pT)$ for single hadron photoproduction at high $p_T$ at COMPASS |
title | Measurement of $A_{LL}(pT)$ for single hadron photoproduction at high $p_T$ at COMPASS |
title_full | Measurement of $A_{LL}(pT)$ for single hadron photoproduction at high $p_T$ at COMPASS |
title_fullStr | Measurement of $A_{LL}(pT)$ for single hadron photoproduction at high $p_T$ at COMPASS |
title_full_unstemmed | Measurement of $A_{LL}(pT)$ for single hadron photoproduction at high $p_T$ at COMPASS |
title_short | Measurement of $A_{LL}(pT)$ for single hadron photoproduction at high $p_T$ at COMPASS |
title_sort | measurement of $a_{ll}(pt)$ for single hadron photoproduction at high $p_t$ at compass |
topic | Particle Physics - Experiment |
url | https://dx.doi.org/10.22323/1.203.0223 http://cds.cern.ch/record/2025848 |
work_keys_str_mv | AT levillainmaxime measurementofallptforsinglehadronphotoproductionathighptatcompass |