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Transverse momentum and collision energy dependence of high $p_{T}$ hadron suppression in Au+Au collisions at ultrarelativistic energies

J. Adams

TL;DR

High statistics measurements of inclusive charged hadron production in Au+Au and p+p collisions at sqrt[s(NN)]=200 GeV report no evidence of p(T)-dependent suppression, which may be expected from models incorporating jet attenuation in cold nuclear matter or scattering of fragmentation hadrons.

Abstract

We report high statistics measurements of inclusive charged hadron production in Au+Au and p+p collisions at \sqrtsNN=200 GeV. A large, approximately constant hadron suppression is observed in central Au+Au collisions for $5\lt\pT\lt12$ GeV/c. The collision energy dependence of the yields and the centrality and \pT dependence of the suppression provide stringent constraints on theoretical models of suppression. Models incorporating initial-state gluon saturation or partonic energy loss in dense matter are largely consistent with observations. We observe no evidence of \pT-dependent suppression, which may be expected from models incorporating jet attentuation in cold nuclear matter or scattering of fragmentation hadrons.

Transverse momentum and collision energy dependence of high $p_{T}$ hadron suppression in Au+Au collisions at ultrarelativistic energies

TL;DR

High statistics measurements of inclusive charged hadron production in Au+Au and p+p collisions at sqrt[s(NN)]=200 GeV report no evidence of p(T)-dependent suppression, which may be expected from models incorporating jet attenuation in cold nuclear matter or scattering of fragmentation hadrons.

Abstract

We report high statistics measurements of inclusive charged hadron production in Au+Au and p+p collisions at \sqrtsNN=200 GeV. A large, approximately constant hadron suppression is observed in central Au+Au collisions for GeV/c. The collision energy dependence of the yields and the centrality and \pT dependence of the suppression provide stringent constraints on theoretical models of suppression. Models incorporating initial-state gluon saturation or partonic energy loss in dense matter are largely consistent with observations. We observe no evidence of \pT-dependent suppression, which may be expected from models incorporating jet attentuation in cold nuclear matter or scattering of fragmentation hadrons.

Paper Structure

This paper contains 1 equation, 4 figures, 1 table.

Figures (4)

  • Figure 1: Inclusive invariant $p_T$ distributions of $(\hbox{$\mathrm{h}^+$}+\hbox{$\mathrm{h}^-$})/2$ for centrality-selected Au+Au and p+p NSD interactions. Hash marks at the top indicate bin boundaries for $p_T$$>$4 GeV/c. The invariant cross section for p+p is indicated on the right vertical axis.
  • Figure 2: $R_{200/130}(\hbox{$p_T$})$ vs. $p_T$ for $(\hbox{$\mathrm{h}^+$}+\hbox{$\mathrm{h}^-$})/2$ for four different centrality bins. The overall normalization uncertainty is $^{+6}_{-10}$% for the 40-60% bin and is negligible for the other panels. Calculations are described in the text.
  • Figure 3: $R_{AA}(\hbox{$p_T$})$ (Eq. \ref{['RAA']}) for $(\hbox{$\mathrm{h}^+$}+\hbox{$\mathrm{h}^-$})/2$ in $|\eta|$$<$0.5, for centrality-selected Au+Au spectra relative to the measured p+p spectrum. The p+p spectrum is common to all panels. Calculations are described in the text.
  • Figure 4: $R_{CP}(\hbox{$p_T$})$ vs. $p_T$ for $(\hbox{$\mathrm{h}^+$}+\hbox{$\mathrm{h}^-$})/2$. Calculations are described in the text.