# Energy dependence of $\pi^{\pm}$, $p$ and $\bar{p}$ transverse momentum spectra for Au+Au collisions at $\sqrt{s_{NN}}$=62.4 and 200 GeV

Abstract : We study the energy dependence of the transverse momentum $(p_T)$ 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 $0.2\le p_T\le12$ GeV/c . In the intermediate $p_T$ region $(0.2\le p_T\le 6 GeV/c$ ), the nuclear modification factor is higher at 62.4 GeV than at 200 GeV, while at higher $p_T (p_T\ge 7 GeV/c)$ the modification is similar for both energies. The p/$\pi+$ and $\bar{p} \pi^-$ ratios for central collisions at $\sqrt{S_{NN}}$ =62.4 GeV/c peak at $p_t \appeq 2 Gev/c$ . In the $p_T$ range where recombination is expected to dominate, the p/$\pi + ratios at 62.4 GeV are larger than at 200 GeV, while the$\bar{p}$/$\pi _-} ratios are smaller. For $p_T$, the $\bar{p} /\pi_-$ ratios at the two beam energies are independent of $p_T$ and centrality indicating that the dependence of the $\bar{p}:\pi_-$ ratio on $p_T$ does not change between 62.4 and 200 GeV. These findings challenge various models incorporating jet quenching and/or constituent quark coalescence
Mots-clés :
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00158104
Contributor : Yvette Heyd <>
Submitted on : Thursday, June 28, 2007 - 10:04:42 AM
Last modification on : Thursday, August 6, 2020 - 6:23:56 PM

### Citation

B.I. Abelev, M.M. Aggarwal, Z. Ahammed, B.D. Anderson, D. Arkhipkin, et al.. Energy dependence of $\pi^{\pm}$, $p$ and $\bar{p}$ transverse momentum spectra for Au+Au collisions at $\sqrt{s_{NN}}$=62.4 and 200 GeV. Physics Letters B, Elsevier, 2007, 655, pp.104-113. ⟨10.1016/j.physletb.2007.06.035⟩. ⟨in2p3-00158104⟩

Record views