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The invariant mass spectra of e+e- pairs produced in 12-GeV proton-inducednuclear reactions are measured at the KEK Proton-Synchrotron. On the low-massside of the omega meson peak, a significant enhancement over the known hadronicsources has been observed. The mass spectra, including the excess, are wellreproduced by a model that takes into account the density dependence of thevector meson mass modification, as theoretically predicted.Comment: 4 pages, 3 figures, Version accepted for Physical Review Lette

physical review letters

Experimental Signature of Medium Modifications for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ρ</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>ω</mml:mi></mml:math>Mesons in the 12 GeV<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>p</mml:mi><mml:mo>+</mml:mo><mml:mi>A</mml:mi></mml:math>Reactions

Experimental Signature of Medium Modifications forρandωMesons in the 12 GeVp+AReactions