Abstract
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 an enhancement over the known hadronic sources on the low-mass side of the ω meson mass peak. The obtained ρ/ω ratio indicates that this enhancement mainly results from ρ mesons whose mass was modified in nuclear matter. We performed a toy model calculation based on the prediction using the QCD sum rule. It reproduced well the tendency of our data.
Original language | English |
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Pages (from-to) | S1023-S1026 |
Journal | Journal of Physics G: Nuclear and Particle Physics |
Volume | 30 |
Issue number | 8 |
DOIs | |
Publication status | Published - 2004 Aug |
Externally published | Yes |
ASJC Scopus subject areas
- Nuclear and High Energy Physics