Multiplicity and pseudorapidity distributions of photons in Au + Au collisions at s(NN)**(1/2) = 62.4-GeV

The STAR collaboration
Phys.Rev.Lett. 95 (2005) 062301, 2005.

Abstract (data abstract)
We present the first measurement of multiplicity and pseudorapidity distributions of photons in the pseudorapidity region $2.3 \leq \eta \leq 3.7$ for different centralities in Au + Au collisions at $\sqrt{s_{NN}}$ = 62.4 GeV. We find that the photon yield in this pseudorapidity range scales with the number of participating nucleons at all collision centralities studied. The pseudorapidity distribution of photons, dominated by neutral pion decays, has been compared to those of identified charged pions, photons, and inclusive charged particles from heavy ion and nucleon-nucleon collisions at various energies. The photon production in the measured pseudorapidity region has been shown to be consistent with the energy and centrality independent limiting fragmentation scenario.

  • Figure 2

    Data from Figure 2


    ${dN_{\gamma}}\over{d\eta}$ for various event centrality classes compared to HIJING and AMPT model calculations.

  • Figure 3

    Data from Figure 3


    Variation of $N_{\gamma}$ per participant pair in PMD coverage $(2.3 \leq \eta \leq 3.7)$ as a function of $N_{part}$. The...

  • Figure 5

    Data from Figure 5


    (Color Online) Estimated ${dN_{\pi^{0}}}\over{dy}$ from ${dN_{\gamma}}\over{dy}$ normalized to $N_{part}$, as compared to ${dN_{\pi^{\pm}}}\over{dy}$ normalized to $N_{part}$, as a function of...

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