ρ0 Production and Possible Modification in Au+Au and p+p Collisions at √(sNN)=200 GeV
Abstract
We report results on ρ(770)0→π+π- production at midrapidity in p+p and peripheral Au+Au collisions at √(sNN)=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 dynamical effects are discussed.
- Publication:
-
Physical Review Letters
- Pub Date:
- March 2004
- DOI:
- 10.1103/PhysRevLett.92.092301
- arXiv:
- arXiv:nucl-ex/0307023
- Bibcode:
- 2004PhRvL..92i2301A
- Keywords:
-
- 25.75.Dw;
- 13.85.Hd;
- Particle and resonance production;
- Inelastic scattering: many-particle final states;
- Nuclear Experiment
- E-Print:
- 6 pages, 4 figures, as accepted for Phys. Rev. Lett. The data tables are at http://www.star.bnl.gov/central/publications/pubDetail.php?id=26