Phys. Rev. Lett. 92, 092301 (2004) [6 pages]

ρ0 Production and Possible Modification in Au+Au and p+p Collisions at sqrt[sNN]=200  GeV

Download: PDF (251 kB) or Buy this Article (Use Article Pack) Export: BibTeX or EndNote (RIS)

J. Adams et al.
Show All Authors/Affiliations

Received 28 July 2003; published 5 March 2004

We report results on ρ(770)0→π+π- production at midrapidity in p+p and peripheral Au+Au collisions at sqrt[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.


©2004 The American Physical Society

URL: http://link.aps.org/abstract/PRL/v92/e092301
DOI: 10.1103/PhysRevLett.92.092301
PACS: 25.75.Dw, 13.85.Hd

[ Abstract  |  Previous article  |  Next article  |  Issue 9 ]