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ϒ production in p(d)A collisions at RHIC and the LHC

  • E. G. Ferreiro
  • F. Fleuret
  • J. P. LansbergEmail author
  • N. Matagne
  • A. Rakotozafindrabe
Regular Article - Theoretical Physics

Abstract

We study the effect of nuclear matter in ϒ production in dAu collisions at RHIC and pPb collisions at the LHC. We find that the nuclear modification factor, \(R^{\varUpsilon}_{d\mathrm{Au}}\), measured at RHIC is not satisfactorily reproduced by the conventional effects used in the literature, namely the modification of the gluon distribution in bound nucleons and an—effective—survival probability for a bound state to escape the nucleus. In particular, we argue that this probability should be close to 1 as opposed to the J/ψ case. We note that, at backward rapidities, the unexpected suppression of \(R^{\varUpsilon}_{d\rm Au}\) observed by PHENIX hints at the presence of a gluon EMC effect, analogous to the quark EMC effect—but likely stronger. Further nuclear matter effects, such as saturation and fractional energy loss, are discussed, but none of them fit in a more global picture of quarkonium production. Predictions for ϒ(nS) for the forthcoming pPb run at 5 TeV at the LHC are also presented.

Keywords

Gluon Distribution Gluon Density PbPb Collision Free Nucleon Collinear Factorisation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

We are grateful to J. Albacete, F.Arleo, N. Armesto, R. Arnaldi, S.J. Brodsky, B.Z. Kopeliovich, M. Leitch, S. Peigné and C. Salgado, for useful discussions. This work is supported in part by Ministerios de Educacion y Ciencia of Spain and IN2P3 of France (AIC-D-2011-0740) and by the ReteQuarkonii Networking of the EU I3 Hadron Physics 2 program. N.M. thanks the F.R.S.-FNRS (Belgium) for financial support.

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Copyright information

© Springer-Verlag Berlin Heidelberg and Società Italiana di Fisica 2013

Authors and Affiliations

  • E. G. Ferreiro
    • 1
  • F. Fleuret
    • 2
  • J. P. Lansberg
    • 3
    Email author
  • N. Matagne
    • 4
  • A. Rakotozafindrabe
    • 5
  1. 1.Departamento de Física de Partículas and IGFAEUniversidad de Santiago de CompostelaSantiago de CompostelaSpain
  2. 2.Laboratoire Leprince Ringuet, École PolytechniqueCNRS/IN2P3PalaiseauFrance
  3. 3.IPNO, Université Paris-SudCNRS/IN2P3OrsayFrance
  4. 4.Service de Physique Nucléaire et SubnucléaireUniversité de MonsMonsBelgium
  5. 5.IRFU/SPhNCEA SaclayGif-sur-Yvette CedexFrance

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