rho^0 Production and Possible Modification in Au+Au and p+p Collisions at sqrt(s_NN) = 200 GeV

Abstract

We report results on rho(770)^0 -> pi+pi- production at midrapidity in p+p and peripheral Au+Au collisions at sqrt(s_NN) = 200 GeV. This is the first direct measurement of rho(770)^0 -> pi+pi- in heavy-ion collisions. The measured rho^0 peak in the invariant mass distribution is shifted by ~40 MeV/c^2 in minimum bias p+p interactions and ~70 MeV/c^2 in peripheral Au+Au collisions. The rho^0 mass shift is dependent on transverse momentum and multiplicity. The modification of the rho^0 meson mass, width, and shape due to phase space and dynamical effects are discussed.

arXiv comment6 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

References in corpus (12)

• HIJING 1.0: A Monte Carlo Program for Parton and Particle Production in High Energy Hadronic and Nuclear Collisions
• The STAR Time Projection Chamber: A Unique Tool for Studying High Multiplicity Events at RHIC
• Hadron production in Au-Au collisions at RHIC
• Multiplicity distribution and spectra of negatively charged hadrons in Au+Au collisions at sqrt(s_nn) = 130 GeV
• Coherent rho^0 Production in Ultra-Peripheral Heavy Ion Collisions
• Matter-induced modification of resonances at RHIC freezeout
• Recent results from Pb-Au collisions at 158 GeV/c per nucleon obtained with the CERES spectrometer
• Dynamics and freeze-out of hadron resonances at RHIC
• Dileptons and Photons from Coarse-Grained Microscopic Dynamics and Hydrodynamics Compared to Experimental Data
• Statistical hadronisation phenomenology
• A simple approach to describe hadron production rates in $e^{+}{e}^{-}$ annihilation
• Photon and Light Meson Production in Hadronic Z^0 Decays

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