Multiplicity distribution and spectra of negatively charged hadrons in Au+Au collisions at s(NN)**(1/2) = 130-GeV

The STAR collaboration
Phys.Rev.Lett. 87 (2001) 112303, 2001.

The minimum bias multiplicity distribution and the transverse momentum and pseudorapidity distributions for central collisions have been measured for negative hadrons (h-) in Au+Au interactions at sqrt(s_nn) = 130 GeV. The multiplicity density at midrapidity for the 5% most central interactions is dNh-/deta|_{eta = 0} = 280 +- 1(stat)+- 20(syst), an increase per participant of 38% relative to ppbar collisions at the same energy. The mean transverse momentum is 0.508 +- 0.012 GeV/c and is larger than in central Pb+Pb collisions at lower energies. The scaling of the h- yield per participant is a strong function of pt. The pseudorapidity distribution is almost constant within |eta|<1.

  • Figure 1


    Normalized multiplicity distribution of $h^{−}$ with $p_{T} > 100$ MeV/$c$ at $|\eta| < 0.5$ in Au+Au collisions at $\sqrt{s_{NN}} =...

  • Figure 2 upper panel


    $h^{−}$ $p_{T}$-spectra for the $5\%$ most central Au+Au collisions at midrapidity ($|\eta| < 0.1$) for several systems. The correlated systematical...

  • Figure 2 lower panel


    ratio of STAR and scaled UA1 $p_{T}$-distributions. The errors given are the errors of the STAR data only and do...

  • Figure 3


    $h^{−}$ pseudorapidity distribution from $5\%$ most central Au+Au collisions for $p_{T} > 100$ MeV/$c$ (filled circles) and all $p_{T}$ (open...

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