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dc.contributor.authorGay Ducati, Maria Beatrizpt_BR
dc.contributor.authorOliveira, Emmanuel Gräve dept_BR
dc.date.accessioned2015-05-13T02:00:41Zpt_BR
dc.date.issued2010pt_BR
dc.identifier.issn1550-7998pt_BR
dc.identifier.urihttp://hdl.handle.net/10183/116131pt_BR
dc.description.abstractThe Drell–Yan dilepton production at backward rapidities is studied in proton-nucleus collisions at Relativistic Heavy Ion Collider and LHC energies by comparing two different approaches: the kT factorization at next-to-leading order with intrinsic transverse momentum and the same process formulated in the target rest frame, i.e., the color dipole approach. Our results are expressed in terms of the ratio between pðdÞ A and p p collisions as a function of transverse momentum and rapidity. Three nuclear parton distribution functions are used: EKS (Eskola, Kolhinen, and Ruuskanen), EPS08, and EPS09 and, in both approaches, dileptons show sensitivity to nuclear effects, specially regarding the intrinsic transverse momentum. Also, there is room to discriminate between formalisms: the color dipole approach lacks soft effects introduced by the intrinsic kT. Geometric scaling GBW (Golec-Biernat and Wusthoff ) and BUW (Boer, Utermann, and Wessels) color dipole cross section models and also a DHJ (Dumitru, Hayashigaki, and Jalilian-Marian) model, which breaks geometric scaling, are used. No change in the ratio between collisions is observed, showing that this observable is not changed by the particular shape of the color dipole cross section. Furthermore, our kT factorization results are compared with color glass condensate results at forward rapidities: the results agree at Relativistic Heavy Ion Collider although disagree at LHC, mainly due to the different behavior of target gluon and quark shadowing.en
dc.format.mimetypeapplication/pdf
dc.language.isoengpt_BR
dc.relation.ispartofPhysical review. D, Particles, fields, gravitation, and cosmology. College Park. Vol. 81, no. 5 (Mar. 2010), 054015, 10 p.pt_BR
dc.rightsOpen Accessen
dc.subjectFisica de particulas elementares e campospt_BR
dc.subjectCromodinâmica quânticapt_BR
dc.subjectProcesso Drell-Yanpt_BR
dc.subjectDileptonspt_BR
dc.subjectRhic : Acelerador de particulaspt_BR
dc.titleBackward dilepton production in color dipole and parton modelspt_BR
dc.typeArtigo de periódicopt_BR
dc.identifier.nrb000737402pt_BR
dc.type.originEstrangeiropt_BR


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