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Angular distributions of leptons from J/ ψ's produced in 920 GeV fixed-target proton-nucleus collisions

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dc.contributor.authorConde, P.
dc.contributor.authorGarrido Beltrán, Lluís
dc.contributor.authorPeralta, D.
dc.contributor.authorHERA-B Collaboration
dc.date.accessioned2014-07-28T10:44:00Z
dc.date.available2014-07-28T10:44:00Z
dc.date.issued2009
dc.date.updated2014-07-28T10:44:00Z
dc.description.abstractA study of the angular distributions of leptons from decays of J/ψ"s produced in p-C and p-W collisions at s√=41.6~GeV has been performed in the J/ψ Feynman-x region −0.34<x F <0.14 and for J/ψ transverse momenta up to 5.4 GeV/c. The data were collected by the HERA-B experiment at the HERA proton ring of the DESY laboratory. The results, based on a clean selection of 2.3×105 J/ψ"s reconstructed in both the e + e − and μ + μ − decay channels, indicate that J/ψ"s are produced polarized. The magnitude of the effect is maximal at low p T . For p T >1 GeV/c a significant dependence on the reference frame is found: the polar anisotropy is more pronounced in the Collins-Soper frame and almost vanishes in the helicity frame, where, instead, a significant azimuthal anisotropy arises.
dc.format.extent8 p.
dc.format.mimetypeapplication/pdf
dc.identifier.idgrec577648
dc.identifier.issn1434-6044
dc.identifier.urihttps://hdl.handle.net/2445/56366
dc.language.isoeng
dc.publisherSocietà Italiana di Fisica & Springer Verlag
dc.relation.isformatofReproduccció del document publicat a: http://doi.dx.org/ 10.1140/epjc/s10052-009-0957-7
dc.relation.ispartofEuropean Physical Journal C, 2009, vol. 60, num. 4, p. 517-524
dc.relation.urihttp://dx.doi.org/10.1140/epjc/s10052-009-0957-7
dc.rightscc by (c) HERA-B Collaboration, 2009
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/
dc.sourceArticles publicats en revistes (Física Quàntica i Astrofísica)
dc.subject.classificationAstronomia
dc.subject.classificationAstrofísica
dc.subject.classificationFísica nuclear
dc.subject.classificationPartícules (Física nuclear)
dc.subject.classificationTeoria quàntica de camps
dc.subject.otherAstronomy
dc.subject.otherAstrophysics
dc.subject.otherNuclear physics
dc.subject.otherParticles (Nuclear physics)
dc.subject.otherQuantum field theory
dc.titleAngular distributions of leptons from J/ ψ's produced in 920 GeV fixed-target proton-nucleus collisions
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/publishedVersion

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