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dc.contributor.authorAdare, A.
dc.contributor.authorAfanasiev, S.
dc.contributor.authorAidala, C.
dc.contributor.authorAjitanand, N. N.
dc.contributor.authorAkiba, Y.
dc.contributor.authorAl-Bataineh, H.
dc.contributor.authorAlexander, J.
dc.contributor.authorAngerami, A.
dc.contributor.authorAoki, K.
dc.contributor.authorApadula, N.
dc.contributor.authorKim, Dong Jo
dc.contributor.authorRak, Jan
dc.date.accessioned2014-09-01T08:51:38Z
dc.date.available2014-09-01T08:51:38Z
dc.date.issued2014fi
dc.identifier.citationAdare, A., Afanasiev, S., Aidala, C., Ajitanand, N., Akiba, Y., Al-Bataineh, H., . . . Rak, J. (2014). Heavy-flavor electron-muon correlations in p+p and d+Au collisions at sNN−−−−√=200 GeV. <em>Physical Review C</em>, 89 (3), 034915. <a href="http://dx.doi.org/10.1103/PhysRevC.89.034915">doi:10.1103/PhysRevC.89.034915</a>fi
dc.identifier.otherTUTKAID_62095
dc.identifier.urihttps://jyx.jyu.fi/handle/123456789/44159
dc.description.abstractBackground: Heavy-flavor modification in relativistic p ( d ) + A collisions are sensitive to different kinds of strong-interaction physics ranging from modifications of the nuclear wave function to initial- and final-state energy loss. Modifications to single heavy-flavor particles and their decay leptons at midrapidity and forward rapidity are well established at the Relativistic Heavy Ion Collider (RHIC). Purpose: This paper presents measurements of azimuthal correlations of electron-muon pairs produced from heavy-flavor decays, primarily c ̄ c ,in √ s NN = 200 GeV p + p and d + Au collision using the PHENIX detector at RHIC. The electrons are measured at midrapidity while the muons in the pair are measured at forward rapidity, defined as the direction of the deuteron beam, in order to utilize the deuteron to probe low- x partons in the gold nucleus. Methods: This analysis uses the central spectrometer arms for electron identification and forward spectrometer arms for muon identification. Azimuthal correlations are built in all sign combinations for e - μ pairs. Subtracting the like-sign yield from the unlike-sign yield removes the correlations from light flavor decays and conversions. Results: Comparing the p + p results with several different Monte Carlo event generators, we find the results are consistent with a total charm cross section σ c ̄ c = 538 ± 46 (stat) ± 197 (data syst) ± 174 (model syst) μ b. These generators also indicate that the back-to-back peak at φ = π is dominantly from the leading-order contributions (gluon fusion), while higher-order processes (flavor excitation and gluon splitting) contribute to the yield at all φ . We observe a suppression in the pair yield per collision in d + Au. We find the pair yield suppression factor for 2 . 7 < φ< 3 . 2radis J dA = 0 . 433 ± 0 . 087 (stat) ± 0.135 (syst). Conclusions: The e - μ pairs result from partons at x Au ∼ 10 − 2 at Q 2 = 10 GeV /c 2 at the edge of the shadowing region. The pair suppression indicates modification to c ̄ c pairs for these kinematics in the cold nuclear medium at RHIC.fi
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.relation.ispartofseriesPhysical Review C
dc.relation.urihttp://journals.aps.org/prc/abstract/10.1103/PhysRevC.89.034915
dc.subject.otherdau collisionsfi
dc.titleHeavy-flavor electron-muon correlations in p+p and d+Au collisions at sNN−−−−√=200 GeVfi
dc.typearticle
dc.identifier.urnURN:NBN:fi:jyu-201408262639
dc.contributor.laitosFysiikan laitosfi
dc.contributor.laitosDepartment of Physicsen
dc.contributor.oppiaineFysiikka
dc.type.urihttp://purl.org/eprint/type/SubmittedJournalArticle
dc.date.updated2014-08-26T03:30:22Z
dc.type.coarjournal article
dc.description.reviewstatuspeerReviewed
dc.relation.issn0556-2813
dc.relation.numberinseries3
dc.relation.volume89
dc.type.versionpublishedVersion
dc.rights.copyright©2014 American Physical Society. This is an article whose final and definitive form has been published by American Physical Society.
dc.rights.accesslevelopenAccessfi
dc.rights.urlhttp://creativecommons.org/licenses/by/3.0/
dc.relation.doi10.1103/PhysRevC.89.034915


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©2014 American Physical Society. This is an article whose final and definitive form has been published by American Physical Society.
Except where otherwise noted, this item's license is described as ©2014 American Physical Society. This is an article whose final and definitive form has been published by American Physical Society.