First measurement of the Sivers asymmetry for gluons using SIDIS data

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dc.contributor.authorŠulc Miroslavcs
dc.contributor.organizationThe COMPASS Collaboration
dc.date.accessioned2018-09-25T12:18:22Z
dc.date.available2018-09-25T12:18:22Z
dc.date.issued2017cs
dc.description.abstractThe Sivers function describes the correlation between the transverse spin of a nucleon and the transverse motion of its partons. For quarks, it was studied in previous measurements of the azimuthal asymmetry of hadrons produced in semi-inclusive deep inelastic scattering of leptons off transversely polarised nucleon targets, and it was found to be non-zero. In this letter the evaluation of the Sivers asymmetry for gluons is presented. The contribution of the photon–gluon fusion subprocess is enhanced by requiring two high transverse-momentum hadrons. The analysis method is based on a Monte Carlo simulation that includes three hard processes: photon–gluon fusion, QCD Compton scattering and the leading-order virtual-photon absorption process. The Sivers asymmetries of the three processes are simultaneously extracted using the LEPTO event generator and a neural network approach. The method is applied to samples of events containing at least two hadrons with large transverse momentum from the COMPASS data taken with a 160 GeV/c muon beam scattered off transversely polarised deuterons and protons. With a significance of about two standard deviations, a negative value is obtained for the gluon Sivers asymmetry. The result of a similar analysis for a Collins-like asymmetry for gluons is consistent with zero.
dc.format.extent11cs
dc.identifier.doi10.1016/j.physletb.2017.07.018
dc.identifier.issn0370-2693cs
dc.identifier.urihttps://dspace.tul.cz/handle/15240/31802
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0370269317305749?via%3Dihub
dc.language.isoengcs
dc.publisherElsevier BVcs
dc.relation.ispartofPhysics Letters B
dc.relation.urihttps://api.elsevier.com/content/article/eid/1-s2.0-S0370269317305749cs
dc.subjectDeep inelastic scatteringcs
dc.subjectGluoncs
dc.subjectPDFcs
dc.subjectSiverscs
dc.subjectTMDcs
dc.titleFirst measurement of the Sivers asymmetry for gluons using SIDIS datacs
local.citation.epage854-864cs
local.citation.spage854-864cs
local.identifier.publikace5271
local.identifier.wok411369700120en
local.relation.issue9cs
local.relation.volume772
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