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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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Autor principal: Levillain, Maxime
Lenguaje:eng
Publicado: SISSA 2014
Materias:
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
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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