• Browse all
Energy and system size dependence of phi meson production in Cu+Cu and Au+Au collisions

The STAR collaboration
Phys.Lett.B 673 (2009) 183-191, 2009.

Abstract (data abstract)
We study the beam-energy and system-size dependence of $\phi$ meson production (using the hadronic decay mode $\phi \to K^{+}K^{-}$) by comparing the new results from $Cu+Cu$ collisions and previously reported $Au+Au$ collisions at $\sqrt{s_{NN}}=62.4$ and 200 GeV measured in the STAR experiment at RHIC. Data presented in this Letter are from mid-rapidity $(|y| < 0.5)$ for $0.4 < p_{T} < 5$ GeV/$c$. At a given beam energy, the transverse momentum distributions for $\phi$ mesons are observed to be similar in yield and shape for $Cu+Cu$ and $Au+Au$ colliding systems with similar average numbers of participating nucleons. The $\phi$ meson yields in nucleus-nucleus collisions, normalized by the average number of participating nucleons, are found to be enhanced relative to those from $p+p$ collisions. The enhancement for $\phi$ mesons lies between strange hadrons having net strangeness = 1 ($K^{−}$ and $\bar{\Lambda}$) and net strangeness = 2 ($\Xi$). The enhancement for $\phi$ mesons is observed to be higher at $\sqrt{s_{NN}}=200$ GeV compared to 62.4 GeV. These observations for the produced $\phi (s\bar{s})$ mesons clearly suggest that, at these collision energies, the source of enhancement of strange hadrons is related to the formation of a dense partonic medium in high energy nucleus-nucleus collisions and cannot be alone due to canonical suppression of their production in smaller systems.

  • Table 1a

    Data from Fig. 2, left panel

    10.17182/hepdata.101351.v1/t1

    Midrapidity $(|y| < 0.5)$ transverse momentum spectra of $\phi$ mesons for various collision centrality classes for $Cu+Cu$ collisions at $\sqrt{s_{NN}}=62.4$...

  • Table 1b

    Data from Fig. 2, right panel

    10.17182/hepdata.101351.v1/t2

    Midrapidity $(|y| < 0.5)$ transverse momentum spectra of $\phi$ mesons for various collision centrality classes for $Cu+Cu$ collisions at $\sqrt{s_{NN}}=62.4$...

  • Table 2a

    Data from Fig. 4, upper panels, 0-10%

    10.17182/hepdata.101351.v1/t3

    Upper panels. $N_{\scriptsize{\mbox{part}}}$ scaled ($R^{N_{\scriptsize{\mbox{part}}}}_{AA}$) nuclear modification factors as a function of $p_{T}$ of $\phi$ mesons for $0-10\%$ and $20-30\%$...

  • Table 2b

    Data from Fig. 4, upper panels, 20-30%

    10.17182/hepdata.101351.v1/t4

    Upper panels. $N_{\scriptsize{\mbox{part}}}$ scaled ($R^{N_{\scriptsize{\mbox{part}}}}_{AA}$) nuclear modification factors as a function of $p_{T}$ of $\phi$ mesons for $0-10\%$ and $20-30\%$...

  • Table 2c

    Data from Fig. 4, lower panels, 0-10%

    10.17182/hepdata.101351.v1/t5

    Upper panels. $N_{\scriptsize{\mbox{part}}}$ scaled ($R^{N_{\scriptsize{\mbox{part}}}}_{AA}$) nuclear modification factors as a function of $p_{T}$ of $\phi$ mesons for $0-10\%$ and $20-30\%$...

  • Table 2d

    Data from Fig. 4, lower panels, 20-30%

    10.17182/hepdata.101351.v1/t6

    Upper panels. $N_{\scriptsize{\mbox{part}}}$ scaled ($R^{N_{\scriptsize{\mbox{part}}}}_{AA}$) nuclear modification factors as a function of $p_{T}$ of $\phi$ mesons for $0-10\%$ and $20-30\%$...

  • Table 3a

    Data from Fig. 5, upper panel

    10.17182/hepdata.101351.v1/t7

    Upper panel. The ratio of the yields of $K^{−}$, $\phi$, $\bar{\Lambda}$ and $\Xi+\bar{\Xi}$ normalized to $N_{\scriptsize{\mbox{part}}}$ in nucleus-nucleus collisions to...

  • Table 3b

    Data from Fig. 5, lower panel

    10.17182/hepdata.101351.v1/t8

    Upper panel. The ratio of the yields of $K^{−}$, $\phi$, $\bar{\Lambda}$ and $\Xi+\bar{\Xi}$ normalized to $N_{\scriptsize{\mbox{part}}}$ in nucleus-nucleus collisions to...

Loading Data...

Ask a Question


Your question will be emailed to those involved with the submission. Please mention the relevant table.


Please log in to HEPData to send a question.