System Size and Centrality Dependence of Charged Hadron Transverse Momentum Spectra in Au+Au and Cu+Cu Collisions at {radical}(s{sub NN})=62.4 and 200 GeV
Journal Article
·
· Physical Review Letters
- Massachusetts Institute of Technology, Cambridge, Massachusetts 02139-4307 (United States)
- Argonne National Laboratory, Argonne, Illinois 60439-4843 (United States)
We present transverse momentum distributions of charged hadrons produced in Cu+Cu collisions at {radical}(s{sub NN})=62.4 and 200 GeV. The spectra are measured for transverse momenta of 0.25<p{sub T}<5.0 GeV/c at {radical}(s{sub NN})=62.4 GeV and 0.25<p{sub T}<7.0 GeV/c at {radical}(s{sub NN})=200 GeV, in a pseudorapidity range of 0.2<{eta}<1.4. The nuclear modification factor R{sub AA} is calculated relative to p+p data at both collision energies as a function of collision centrality. At a given collision energy and fractional cross section, R{sub AA} is observed to be systematically larger in Cu+Cu collisions compared to Au+Au. However, for the same number of participating nucleons, R{sub AA} is essentially the same in both systems over the measured range of p{sub T}, in spite of the significantly different geometries of the Cu+Cu and Au+Au systems.
- OSTI ID:
- 20775260
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 21 Vol. 96; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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