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COMPASS measurement of the $P_T$ weighted Sivers asymmetry

The SIDIS transverse spin asymmetries weighted with powers of $P_T$, the hadron transverse momentum in the $\gamma N$ reference system,have been introduced already twenty years ago and are considered quite interesting. While the amplitudes of the modulations in the azimuthal distribution of the hadr...

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Autor principal: Bradamante, Franco
Lenguaje:eng
Publicado: 2017
Materias:
Acceso en línea:http://cds.cern.ch/record/2245543
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author Bradamante, Franco
author_facet Bradamante, Franco
author_sort Bradamante, Franco
collection CERN
description The SIDIS transverse spin asymmetries weighted with powers of $P_T$, the hadron transverse momentum in the $\gamma N$ reference system,have been introduced already twenty years ago and are considered quite interesting. While the amplitudes of the modulations in the azimuthal distribution of the hadrons are the ratios of convolutions over transverse momenta of the transverse--momentum dependent parton distributions and of the corresponding fragmentation functions, and can be evaluated analytically only making assumptions on the transverse--momentum dependence of these functions, the weighted asymmetries allow to solve the convolution integrals over transverse--momenta without those assumptions. Using the high statistics data collected in 2010 on transversely polarized proton target COMPASS has evaluated in x-bins the $P_T$ weighted Sivers asymmetry which is proportional to the product of the first transverse moment of the Sivers function and of the fragmentation function. The results are compared to the standard unweighted Sivers asymmetry.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2017
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spelling cern-22455432021-09-16T11:32:18Zhttp://cds.cern.ch/record/2245543engBradamante, FrancoCOMPASS measurement of the $P_T$ weighted Sivers asymmetryhep-phParticle Physics - Phenomenologyhep-exParticle Physics - ExperimentThe SIDIS transverse spin asymmetries weighted with powers of $P_T$, the hadron transverse momentum in the $\gamma N$ reference system,have been introduced already twenty years ago and are considered quite interesting. While the amplitudes of the modulations in the azimuthal distribution of the hadrons are the ratios of convolutions over transverse momenta of the transverse--momentum dependent parton distributions and of the corresponding fragmentation functions, and can be evaluated analytically only making assumptions on the transverse--momentum dependence of these functions, the weighted asymmetries allow to solve the convolution integrals over transverse--momenta without those assumptions. Using the high statistics data collected in 2010 on transversely polarized proton target COMPASS has evaluated in x-bins the $P_T$ weighted Sivers asymmetry which is proportional to the product of the first transverse moment of the Sivers function and of the fragmentation function. The results are compared to the standard unweighted Sivers asymmetry.arXiv:1702.00621oai:cds.cern.ch:22455432017
spellingShingle hep-ph
Particle Physics - Phenomenology
hep-ex
Particle Physics - Experiment
Bradamante, Franco
COMPASS measurement of the $P_T$ weighted Sivers asymmetry
title COMPASS measurement of the $P_T$ weighted Sivers asymmetry
title_full COMPASS measurement of the $P_T$ weighted Sivers asymmetry
title_fullStr COMPASS measurement of the $P_T$ weighted Sivers asymmetry
title_full_unstemmed COMPASS measurement of the $P_T$ weighted Sivers asymmetry
title_short COMPASS measurement of the $P_T$ weighted Sivers asymmetry
title_sort compass measurement of the $p_t$ weighted sivers asymmetry
topic hep-ph
Particle Physics - Phenomenology
hep-ex
Particle Physics - Experiment
url http://cds.cern.ch/record/2245543
work_keys_str_mv AT bradamantefranco compassmeasurementoftheptweightedsiversasymmetry