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Contribution of exclusive diffractive processes to the measured azimuthal asymmetries in SIDIS

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dc.abstract.enHadron leptoproduction in Semi-Inclusive measurements of Deep-Inelastic Scattering (SIDIS) on unpolarised nucleons allows one to get information on the intrinsic transverse momentum of quarks in a nucleon and on the Boer-Mulders function through the measurement of azimuthal modulations in the cross section. These modulations were recently measured by the HERMES experiment at DESY on proton and deuteron targets, and by the COMPASS experiment using the CERN SPS muon beam and a (LiD)-Li-6 target. In both cases, the amplitudes of the cos phi(h) and cos 2 phi(h) modulations show strong kinematic dependences for both positive and negative hadrons. It has been known since some time that the measured final-state hadrons in those SIDIS experiments receive a contribution from exclusive diffractive production of vector mesons, particularly important at large values of z, the fraction of the virtual photon energy carried by the hadron. In previous measurements of azimuthal asymmetries this contribution was not taken into account, because it was not known that it could distort the azimuthal modulations. Presently, a method to evaluate the contribution of the exclusive reactions to the azimuthal asymmetries measured by COMPASS has been developed. The subtraction of this contribution results in a better understanding of the kinematic effects, and the remaining non-zero cos 2 phi(h) modulation gives indication for a non-zero Boer-Mulders effect. (C) 2020 Published by Elsevier B.V.
dc.affiliationUniwersytet Warszawski
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dc.contributor.authorKhokhlov, Yu.A.
dc.contributor.authorKerbizi, A.
dc.contributor.authorKaspar, F.
dc.contributor.authorKhaustov, G.V.
dc.contributor.authorKetzer, B.
dc.contributor.authorKabuß, E.
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dc.contributor.authorKoivuniemi, J.H.
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dc.contributor.authorGrube, B.
dc.contributor.authorHeitz, R.
dc.contributor.authorHarrach, D. von
dc.contributor.authorIshimoto, S.
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dc.contributor.authorHsieh, C.-Y.
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dc.contributor.authorPerdekamp, M. Grosse
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dc.contributor.authorGnesi, I.
dc.contributor.authorGridin, A.
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dc.date.accessioned2024-01-24T20:47:32Z
dc.date.available2024-01-24T20:47:32Z
dc.date.issued2020
dc.description.financePublikacja bezkosztowa
dc.description.number115039
dc.description.volume956
dc.identifier.doi10.1016/J.NUCLPHYSB.2020.115039
dc.identifier.issn0550-3213
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/103698
dc.identifier.weblinkhttps://api.elsevier.com/content/article/PII:S0550321320301255?httpAccept=text/xml
dc.languageeng
dc.pbn.affiliationphysical sciences
dc.relation.ispartofNuclear Physics B
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.titleContribution of exclusive diffractive processes to the measured azimuthal asymmetries in SIDIS
dc.typeJournalArticle
dspace.entity.typePublication