Reanalysis of KEK-PS E325 data finds a velocity-independent low-mass excess in rho/omega dielectron spectra, interpreted as a ~10% downward mass shift of rho and omega mesons in nuclear matter without significant broadening.
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Velocity dependence of the mass modifications of $\rho$ and $\omega$ mesons in 12 GeV $p+A$ reactions
Reanalysis of KEK-PS E325 data finds a velocity-independent low-mass excess in rho/omega dielectron spectra, interpreted as a ~10% downward mass shift of rho and omega mesons in nuclear matter without significant broadening.