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Nuclear matter effects on J/ψ production in asymmetric Cu + Au collisions at sNN=200 GeV

A. Adare et al. (PHENIX Collaboration)
Phys. Rev. C 90, 064908 – Published 18 December 2014
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  • INTRODUCTION
  • PHENIX DETECTOR
  • DATA ANALYSIS
  • RESULTS
  • SUMMARY AND CONCLUSIONS
  • ACKNOWLEDGMENTS
    • References

    Abstract

    We report on J/ψ production from asymmetric Cu + Au heavy-ion collisions at sNN=200 GeV at the Relativistic Heavy Ion Collider at both forward (Cu-going direction) and backward (Au-going direction) rapidities. The nuclear modification of J/ψ yields in Cu + Au collisions in the Au-going direction is found to be comparable to that in Au + Au collisions when plotted as a function of the number of participating nucleons. In the Cu-going direction, J/ψ production shows a stronger suppression. This difference is comparable in magnitude and has the same sign as the difference expected from shadowing effects due to stronger low-x gluon suppression in the larger Au nucleus.

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    • Received 14 April 2014
    • Revised 11 November 2014

    DOI:https://doi.org/10.1103/PhysRevC.90.064908

    ©2014 American Physical Society

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    Issue

    Vol. 90, Iss. 6 — December 2014

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    Images

    • Figure 1
      Figure 1

      A schematic side view of the PHENIX detector configuration for the 2012 run.

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    • Figure 2
      Figure 2

      Dimuon invariant mass spectra measured in central 0–10% [(a)–(d)] and midperipheral (60–70%) [(e)–(h)] collisions integrated over the full pT range. In each figure, the top panels [(a), (b), (e), and (f)] show the distribution of invariant mass, reconstructed from all same-event opposite charge-sign pairs (filled symbols) and mixed-event pairs (open symbols) in Cu + Au collisions. The lower panels [(c), (d), (g), and (h)] show the combinatorial background subtracted pairs from the upper panels. For the 0–10% (60–70%) data, panels (a) and (c) [(e) and (g)] show pairs reconstructed in the backward (−2.2<y<−1.2) and panels (b) and (d) [(f) and (h)] forward (1.2<y<2.2) muons arms, respectively. The solid line represents a fit to the data using a double Gaussian line shape plus an exponential background, see text for details.

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    • Figure 3
      Figure 3

      Nuclear modification factor, RAA, measured as a function of collision centrality (Npart). Values for J/ψ at forward (Cu-going) rapidity are shown as closed circles and at backward (Au-going) rapidity as open circles. For reference, Au + Au data [13] are also shown, averaged over forward and backward rapidities, as red squares.

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    • Figure 4
      Figure 4

      Ratio of forward to backward rapidity (Cu-going/Au-going) J/ψ yields measured in Cu + Au collisions (symbols). Also shown is a model [43] which estimates the contribution from cold nuclear matter; the band represents the extreme nPDF parameter sets as described in Ref. [44].

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