Energy dependence of pi+-, p and anti-p transverse momentum spectra for Au+Au collisions at s(NN)**(1/2) = 62.4 and 200-GeV

The STAR collaboration
Phys.Lett.B 655 (2007) 104-113, 2007.

Abstract (data abstract)
We study the energy dependence of the transverse momentum (pT) spectra for charged pions, protons and anti-protons for Au+Au collisions at \sqrt{s_NN} = 62.4 and 200 GeV. Data are presented at mid-rapidity (|y| < 0.5) for 0.2 < pT < 12 GeV/c. In the intermediate pT region (2 < pT < 6 GeV/c), the nuclear modification factor is higher at 62.4 GeV than at 200 GeV, while at higher pT (pT >7 GeV/c) the modification is similar for both energies. The p/pi+ and pbar/pi- ratios for central collisions at \sqrt{s_NN} = 62.4 GeV peak at pT ~ 2 GeV/c. In the pT range where recombination is expected to dominate, the p/pi+ ratios at 62.4 GeV are larger than at 200 GeV, while the pbar/pi- ratios are smaller. For pT > 2 GeV/c, the pbar/pi- ratios at the two beam energies are independent of pT and centrality indicating that the dependence of the pbar/pi- ratio on pT does not change between 62.4 and 200 GeV. These findings challenge various models incorporating jet quenching and/or constituent quark coalescence.

  • Figure 1


    Midrapidity (|y| < 0.5) transverse momentum spectra for pions, protons, anti-protons for various event centrality classes for Au+Au at sqrt(sNN)...

  • Figure 1 inset


    The insets show pi−/pi+ ratios at sqrt(sNN) = 62.4 GeV and anti-proton/proton ratios at sqrt(sNN) = 62.4 (0-10%) and 200...

  • Figure 1 minimum bias


    The minimum bias data shown here were extracted from the figures by xyscan. Hence, the dataset is not full (especially...

  • Figure 2


    Centrality and pT dependence of RCP for pions and protons for Au+Au at sqrt(sNN) = 62.4 GeV. For studying the...

  • Figure 4


    The proton (anti-proton) over pion ratios versus pT at sqrt(sNN) = 62.4 and 200 GeV for central and peripheral collisions.

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