phi meson production in Au + Au and p+p collisions at s(NN)**(1/2) = 200-GeV

The STAR collaboration
Phys.Lett.B 612 (2005) 181-189, 2005.

Abstract (data abstract)
We report the STAR measurement of $\phi$ meson production in Au+Au and p+p collisions at $\sqrt{s_{NN}}$ = 200 GeV. Using the event mixing technique, the $\phi$ spectra and yields are obtained at mid-rapidity for five centrality bins in Au+Au collisions and for non-singly-diffractive p+p collisions. It is found that the $\phi$ transverse momentum distributions from Au+Au collisions are better fitted with a single-exponential while the p+p spectrum is better described by a double-exponential distribution. The measured nuclear modification factors indicate that $\phi$ production in central Au+Au collisions is suppressed relative to peripheral collisions when scaled by the number of binary collisions ($<N_{bin}>)$. The systematics of $<p_T>$ versus centrality and the constant $\phi/K^-$ ratio versus beam species, centrality, and collision energy rule out kaon coalescence as the dominant mechanism for $\phi$ production.

  • Figure 1

    Data from Figure 1


    Transverse mass distributions for $\phi$ meson from Au+Au (circles) and p+p (squares) collisions at 200 GeV. For clarity, some Au+Au...

  • Table 1

    Table 1


    Results of $\phi$ meson inverse slope parameter, $$, and dN/dy from NSD p+p and Au+Au collisions at RHIC. All values...

  • Figure 3

    Data from Figure 3a-c


    $R_{CP}$ (a): The ratio of central (top 5%) over peripheral (60-80%) ($R_{CP}$) normalized by $$. The ratios for the $\Lambda$...

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