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Medium modification of vector mesons observed in 12 GeV p+A reactions

Author:
M Naruki   H En'yo   R Muto   T Tabaru   S Yokkaichi   Y Fukao   H Funahashi   M Ishino   H Kanda   M Kitaguchi   S Mihara   K Miwa   T Miyashita   T Murakami   T Nakura   F Sakuma   M Togawa   S Yamada   Y Yoshimura  


Journal:
Journal of Physics G: Nuclear and Particle Physics


Issue Date:
2007


Abstract(summary):

The invariant mass spectra of e+e- pairs produced in 12 GeV p+A reactions are measured at the KEK Proton Synchrotron. We observed a significant enhancement over the known hadronic sources on the low-mass side of the ω meson peak for C and Cu data. The 95%CL allowed parameter regions for ρ/ω ratio are obtained as ρ/ω< 0.15 and ρ/ω< 0.31 for C and Cu targets, respectively. As for the meson, the data obtained with a Cu target revealed a significant excess on the low-mass side of the meson peak mainly in the βγ < 1.25 region.


Page:
S1059-S1063


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