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Experimental signature of medium modifications for rho and omega mesons in the 12 GeV p+A reactions |
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| Authors: | Naruki M Fukao Y Funahashi H Ishino M Kanda H Kitaguchi M Mihara S Miwa K Miyashita T Murakami T Nakura T Sakuma F Togawa M Yamada S Yoshimura Y En'yo H Muto R Tabaru T Yokkaichi S Chiba J Ieiri M Sasaki O Sekimoto M Tanaka K H Hamagaki H Ozawa K |
| Institution: | Department of Physics, Kyoto University, Kitashirakawa Sakyo-ku, Kyoto 606-8502, Japan. naruki@nh.scphys.kyoto-u.ac.jp |
| Abstract: | The invariant mass spectra of e+e- pairs produced in 12 GeV proton-induced nuclear reactions are measured at the KEK Proton Synchrotron. On the low-mass side of the meson peak, a significant enhancement over the known hadronic sources has been observed. The mass spectra, including the excess, are well reproduced by a model that takes into account the density dependence of the vector meson mass modification, as theoretically predicted. |
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