Centrality dependence of charged hadron transverse momentum spectra in d+Au collisions at {radical}{ovr{sup S}NN} = 200 GeV.

Journal Article · Fri Aug 15 04:00:00 EDT 2003 · Phys. Rev. Lett.

OSTI ID:961362

Back, B B; Baker, M D; Ballintijn, M; Barton, D S; Becker, B; George, N; Wuosmaa, A H; BNL,

We have measured transverse momentum distributions of charged hadrons produced in Au+Au collisions at {radical}{ovr S{sub NN}} = 62.4 GeV. The spectra are presented for transverse momenta 0.25 < p{sub T} < 4.5 GeV/c, in a pseudo-rapidity range of 0.2 < {eta} < 1.4. The nuclear modification factor R{sub AA} is calculated relative to p+p data at the same collision energy as a function of collision centrality. For 2 < p{sub T} < 4.5 GeV/c, R{sub AA} is found to be significantly larger than in Au+Au collisions at {radical}{ovr S{sub NN}} = 130 and 200 GeV. In contrast to the large change in R{sub AA}, we observe a very similar centrality evolution of the p{sub T} spectra at {radical}{ovr S{sub NN}} = 62.4 GeV and 200 GeV. The dynamical origin of this surprising factorization of energy and centrality dependence of particle production in heavy ion collisions remains to be understood.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; NSF; FOR
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 961362
• Report Number(s): ANL/PHY/JA-47125
• Journal Information: Phys. Rev. Lett., Journal Name: Phys. Rev. Lett. Journal Issue: 7 ; Aug. 15, 2003 Vol. 91; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

43 PARTICLE ACCELERATORS
BROOKHAVEN RHIC
CHARGED PARTICLES
COLLISIONS
ENERGY
FACTORIZATION
FUNCTIONS
GOLD
HADRONS
HEAVY IONS
ION COLLISIONS
MODIFICATIONS
PARTICLE PRODUCTION
RANGE
SPECTRA
TRANSVERSE MOMENTUM