期刊论文

Adams, J

英文

PHYSICAL REVIEW LETTERS

0031-9007

2004

92

9

092301-1-092301-6

10.1103/PhysRevLett.92.092301

We thank M. Bleicher, P. Braun-Munzinger, W. Broniowski, G. E. Brown, W. Florkowski, P. Kolb, G. D. Lafferty, S. Pratt, R. Rapp, and E. Shuryak for valuable discussions. We thank the RHIC Operations Group and RCF at BNL, and the NERSC Center at LBNL for their support. This work was supported in part by the HENP Divisions of the Office of Science of the U.S. DOE; the U.S. NSF; the BMBF of Germany; IN2P3, RA, RPL, and EMN of France; EPSRC of the United Kingdom; FAPESP of Brazil; the Russian Ministry of Science and Technology; the Ministry of Education and the NNSFC of China; SFOM of the Czech Republic, FOM and UU of The Netherlands, DAE, DST, and CSIR of the Government of India; and the Swiss NSF.

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We report results on ρ(770)0 → π+ π- production at midrapidity in p + p and peripheral Au + Au collisions at psNN = 200 GeV. This is the first direct measurement of ρ(770)0 → π+ π- in heavy-ion collisions. The measured ρ0 peak in the invariant mass distribution is shifted by ∼40 MeV=c2 in minimum bias p + p interactions and ∼70 MeV=c2 in peripheral Au + Au collisions. The ρ0 mass shift is dependent on transverse momentum and multiplicity. The modification of the ρ0 meson mass, width, and shape due to phase space and dynam...