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ϕ meson production in d+Au collisions at sNN=200GeV

A. Adare et al. (PHENIX Collaboration)
Phys. Rev. C 92, 044909 – Published 19 October 2015
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  • INTRODUCTION
  • EXPERIMENT
  • DATA ANALYSIS
  • RESULTS
  • SUMMARY AND CONCLUSIONS
  • ACKNOWLEDGMENTS
  • APPENDICES
    • References

    Abstract

    The PHENIX Collaboration has measured ϕ meson production in d+Au collisions at sNN=200 GeV using the dimuon and dielectron decay channels. The ϕ meson is measured in the forward (backward) d-going (Au-going) direction, 1.2<y<2.2 (−2.2<y<−1.2) in the transverse-momentum (pT) range from 1–7 GeV/c and at midrapidity |y|<0.35 in the pT range below 7 GeV/c. The ϕ meson invariant yields and nuclear-modification factors as a function of pT, rapidity, and centrality are reported. An enhancement of ϕ meson production is observed in the Au-going direction, while suppression is seen in the d-going direction, and no modification is observed at midrapidity relative to the yield in p+p collisions scaled by the number of binary collisions. Similar behavior was previously observed for inclusive charged hadrons and open heavy flavor, indicating similar cold-nuclear-matter effects.

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    • Received 30 June 2015

    DOI:https://doi.org/10.1103/PhysRevC.92.044909

    ©2015 American Physical Society

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    Vol. 92, Iss. 4 — October 2015

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    Images

    • Figure 1
      Figure 1

      A schematic side view of the PHENIX detector configuration in the 2008 data-taking period.

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    • Figure 2
      Figure 2

      The unlike-sign dimuon invariant mass spectrum (solid red points) and the renormalized background spectrum (open blue circles).

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    • Figure 3
      Figure 3

      The fitted unlike-sign dimuon spectrum after background subtraction.

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    • Figure 4
      Figure 4

      The Aɛrec as a function of rapidity (x axis) and pT (y axis) for ϕ mesons.

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    • Figure 5
      Figure 5

      pT-integrated unlike-sign e+e− mass spectrum measured by the PHENIX central arms after subtracting the uncorrelated combinatorial background in the MB d+Au collisions. The dotted line shows the ρ meson contribution and the dashed line is the polynomial background, which describes the residual correlated background. The inset shows the raw spectrum before subtraction, overlaid with the normalized combinatorial background, which is estimated using the mixed-event technique.

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    • Figure 6
      Figure 6

      ϕ meson invariant yields as a function of pT in the Au-going direction (solid blue squares) and in the d-going direction (solid red points). The ϕ meson invariant yields at midrapidity are shown as solid green triangles. The vertical bars represent the statistical uncertainties and the boxes represent type-B systematic uncertainties. The ±6% global uncertainty is the associated type-C uncertainty.

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    • Figure 7
      Figure 7

      Invariant pT spectra of the ϕ meson for different centrality classes in d+Au and p+p collisions at sNN=200 GeV [39]. The vertical bars represent the statistical uncertainties and the boxes represent type-B systematic uncertainties. Type-C systematic uncertainties are 0.1%–5.8% for d+Au invariant yields and 10% for p+p invariant yields. The spectra are scaled by arbitrary factors for clarity.

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    • Figure 8
      Figure 8

      The ϕ meson nuclear-modification factor, RdAu, as a function of pT. The solid blue squares indicate the Au-going direction and the solid red circles indicate the d-going direction. The upright black triangles are for ϕ→K+K− at midrapidity [36] while the inverted green triangles are for ϕ→e+e−. The vertical bars represent the statistical uncertainties and the boxes represent type-B systematic uncertainties. The ±13% global uncertainty is the associated type-C uncertainty.

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    • Figure 9
      Figure 9

      The ϕ meson nuclear modification factor, RdAu, as a function of rapidity. The solid blue squares indicate the Au-going direction, while the d-going direction is shown in solid red circles. At midrapidity, the upright black triangles are for ϕ→K+K− [36], while the inverted green triangles are for ϕ→e+e−. The midrapidity points are slightly displaced from zero for clarity. The vertical bars represent the statistical uncertainties and the boxes represent type-B systematic uncertainties. The ±13% global uncertainty is the associated type-C uncertainty.

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    • Figure 10
      Figure 10

      J/ψ [53] (solid green circles), heavy flavor decay leptons [22, 26] (solid blue triangles), and ϕ meson (solid red squares) nuclear modification factors, RdAu, as functions of rapidity. The vertical bars represent the statistical uncertainties and the boxes represent type-B systematic uncertainties. The type-C systematic uncertainties associated with heavy-flavor and J/ψ meson measurements are 10% and 8%, respectively.

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    • Figure 11
      Figure 11

      The ϕ meson nuclear modification factor, RdAu, as a function of Ncoll. The solid blue squares indicate the Au-going direction, while the d-going direction is shown in solid red circles. At midrapidity, the upright black triangles are for ϕ→K+K− [36], while the inverted green triangles are for ϕ→e+e−. The vertical bars represent the statistical uncertainties and the boxes represent type-B systematic uncertainties. The ±10% global uncertainty is the associated type-C uncertainty.

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    • Figure 12
      Figure 12

      The ϕ meson RdAu as a function of pT for the centralities (a) 0%–20%, (b) 20%–40%, (c) 40%–60%, and (d) 60%–88% in the Au-going direction (solid blue squares) and the d-going direction (solid red circles). At midrapidity, the upright black triangles are from ϕ→K+K− [36], while the inverted green triangles are from ϕ→e+e−. The vertical bars represent the statistical uncertainties and the boxes represent type-B systematic uncertainties. The ±12%–13% global uncertainty is the associated type-C uncertainty.

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