Observation of $ρ/ ω$ Meson Modification in Nuclear Matter

Details Observation of $ρ/ ω$ Meson Modification in Nuclear Matter Observation of $ρ/ ω$ Meson Modification in Nuclear Matter

2000-11-20

arxiv.org/abs/nucl-ex/0011013v2

Phys.Rev.Lett.86:5019-5022,2001

Physics

Nuclear Physics

Nuclear Experiment

8 pages, 3 figures, submitted to Phys. Rev. Letters. all the figures changed to Postscript format, text not changed

Scientific paper

10.1103/PhysRevLett.86.5019

We have measured invariant mass spectra of electron-positron pairs in the
target rapidity region of 12GeV p+A reactions. We have observed a significant
difference in the mass spectra below the $\omega$ meson between p+C and p+Cu
interactions. The difference is interpreted as a signature of the $\rho/\omega$
modification at normal nuclear-matter density.

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