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

Details Experimental Signature of Medium Modifications for rho and omega Mesons in the 12 GeV p + A Reactions Experimental Signature of Medium Modifications for rho and omega Mesons in the 12 GeV p + A Reactions

2005-04-20

arxiv.org/abs/nucl-ex/0504016v4

Phys.Rev.Lett.96:092301,2006

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 3 figures, Version accepted for Physical Review Letter

Scientific paper

10.1103/PhysRevLett.96.092301

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 omega 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.

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