Measurement of Invariant Mass Spectra of Vector Meson Decaying in Nuclear Matter at KEK‐PS
- Conference date: 19-24 May 2003
- Location: New York, NY (USA)
We measured invariant mass spectra of e+e− pairs produced in 12‐GeV p + A interaction to investigate in‐medium mass modification of vector mesons. We observed the excess over the known hadronic sources below the ω meson mass peak. The obtained ρ/ω ratio and velocity dependence of excess/ω ratio imply that this excess mainly results from ρ meson whose mass was modified in nuclear matter.
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