Energy dependence of {pi}{sub {+-}},p and {bar p} transverse momentum spectra for Au+Au collisions at {radical}{ovr s}{sub NN} = 62.4 and 200 GeV.
Journal Article
·
· Phys. Lett. B
We study the energy dependence of the transverse momentum (p{sub T}) spectra for charged pions, protons and anti-protons for Au+Au collisions at {radical}s{sub NN} = 62.4 and 200 GeV. Data are presented at mid-rapidity (|y| < 0.5) for 0.2 < p{sub T} < 12 GeV/c. In the intermediate p{sub T} region (2 < p{sub T} < 6 GeV/c), the nuclear modification factor is higher at 62.4 GeV than at 200 GeV, while at higher p{sub T} (p{sub T} > 7 GeV/c) the modification is similar for both energies. The p/{pi}{sup +} and {bar p}/{pi}{sup -} ratios for central collisions at {radical}s{sub NN} = 62.4 GeV peak at p{sub T} {approx_equal} 2 GeV/c. In the p{sub T} range where recombination is expected to dominate, the p/{pi}{sup +} ratios at 62.4 GeV are larger than at 200 GeV, while the {bar p}/{pi}{sup -} ratios are smaller. For p{sub T} > 2 GeV/c, the {bar p}/{pi}{sup -} ratios at the two beam energies are independent of p{sub T} and centrality indicating that the dependence of the {bar p}/{pi}{sup -} ratio on p{sub T} does not change between 62.4 and 200 GeV. These findings challenge various models incorporating jet quenching and/or constituent quark coalescence.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC; NSF; BMBF - Germany; CNRS/IN2P3, RA, PRL - France; EP-SRC - United Kingdom; FAPESP - Brazil
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 966341
- Report Number(s):
- ANL-HEP-PR-09-100
- Journal Information:
- Phys. Lett. B, Journal Name: Phys. Lett. B Journal Issue: 3-4 ; Oct. 2007 Vol. 655; ISSN PYLBAJ; ISSN 0370-2693
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
Rapidity Dependence of the proton-to-pion ratio in Au+Au and p+p collisions at sqrt NN = 62.4 and GeV
Identified baryon and meson distriburions at large transverse momenta from Au+Au collisions at {radical}{ovr s}{sub NN} = 200 GeV.
Energy dependence of pi, p and pbar transverse momentum spectra for Au+Au collisions at sqrt sNN = 62.4 and 200 GeV
Journal Article
·
Tue May 12 00:00:00 EDT 2009
· Physics Letters, (Section) B
·
OSTI ID:1040433
Identified baryon and meson distriburions at large transverse momenta from Au+Au collisions at {radical}{ovr s}{sub NN} = 200 GeV.
Journal Article
·
Wed Dec 31 23:00:00 EST 2008
· Phys. Rev. Lett.
·
OSTI ID:965755
Energy dependence of pi, p and pbar transverse momentum spectra for Au+Au collisions at sqrt sNN = 62.4 and 200 GeV
Journal Article
·
Mon Mar 26 00:00:00 EDT 2007
· Physical Letters B
·
OSTI ID:936577