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

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28 May 2001

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 86 (22) , 5019-5022
https://doi.org/10.1103/physrevlett.86.5019

Abstract

We measured the invariant mass spectra of electron-positron pairs in the target rapidity region of 12-GeV

p + A

reactions. We have observed a significant difference in the mass spectra below the

ω

meson between

p + C

and

p + Cu

interactions. This difference indicates that the spectral shape of mesons is modified at normal nuclear-matter density.

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