Experimental signature of medium modifications for ρ and ω mesons in the 12 GeV p+A reactions

M. Naruki, 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, H. En'yo, R. Muto, T. Tabaru, S. Yokkaichi, J. ChibaM. Ieiri, O. Sasaki, M. Sekimoto, K. H. Tanaka, H. Hamagaki, K. Ozawa

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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 ω 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.

Original languageEnglish
Article number092301
JournalPhysical Review Letters
Volume96
Issue number9
DOIs
Publication statusPublished - 2006 Mar 20

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    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., ... Ozawa, K. (2006). Experimental signature of medium modifications for ρ and ω mesons in the 12 GeV p+A reactions. Physical Review Letters, 96(9), [092301]. https://doi.org/10.1103/PhysRevLett.96.092301