ρ0Production and possible modification in Au + Au and p + p collisions at √SNN= 200 GeV

STAR Collaboration

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Abstract

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 dynamical effects are discussed.

Original languageEnglish
Article number092301
JournalPhysical Review Letters
Volume92
Issue number9
DOIs
StatePublished - Mar 5 2004

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All Science Journal Classification (ASJC) codes

  • Medicine(all)
  • Physics and Astronomy(all)

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