Published March 10, 2006 | Version v1
Journal article

Experimental Signature of Medium Modifications for ρ and ω Mesons in the 12 GeV p+A Reactions

  • 1. Center for Nuclear Study, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Tokyo 113-0033 (Japan)
  • 2. Institute of Particle and Nuclear Studies, KEK, 1-1 Oho, Tsukuba, Ibaraki 305-0801 (Japan)
  • 3. RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)
  • 4. Department of Physics, Kyoto University, Kitashirakawa Sakyo-ku, Kyoto 606-8502 (Japan)

Description

The invariant mass spectra of e+e- pairs produced in 12 GeV proton-induced nuclear reactions are measured at the KEK Proton Synchrotron. On the low-mass side of the ω meson peak, a significant enhancement over the known hadronic sources has been observed. The mass spectra, including the excess, are well reproduced by a model that takes into account the density dependence of the vector meson mass modification, as theoretically predicted

Additional details

Publishing Information

Journal Title
Physical Review Letters
Journal Volume
96
Journal Issue
9
Journal Page Range
p. 092301-092301.4
ISSN
0031-9007
CODEN
PRLTAO

Optional Information

Notes
(c) 2006 The American Physical Society