Experimental signature of in-medium mass modification of vector mesons at normal nuclear density

R. Muto, J. Chiba, H. En'yo, Y. Fukao, H. Funahashi, H. Hamagaki, M. Ieiri, M. Ishino, H. Kanda, M. Kitaguchi, S. Mihara, K. Miwa, T. Miyashita, T. Murakami, T. Nakura, M. Naruki, M. Nomachi, K. Ozawa, F. Sakuma, O. SasakiH. D. Sato, M. Sekimoto, T. Tabaru, K. H. Tanaka, M. Togawa, S. Yamada, S. Yokkaichi, Y. Yoshimura

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23 Citations (Scopus)

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 languageEnglish
Pages (from-to)S1023-S1026
JournalJournal of Physics G: Nuclear and Particle Physics
Volume30
Issue number8
DOIs
Publication statusPublished - 2004 Aug 1

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Muto, R., Chiba, J., En'yo, H., Fukao, Y., Funahashi, H., Hamagaki, H., Ieiri, M., Ishino, M., Kanda, H., Kitaguchi, M., Mihara, S., Miwa, K., Miyashita, T., Murakami, T., Nakura, T., Naruki, M., Nomachi, M., Ozawa, K., Sakuma, F., ... Yoshimura, Y. (2004). Experimental signature of in-medium mass modification of vector mesons at normal nuclear density. Journal of Physics G: Nuclear and Particle Physics, 30(8), S1023-S1026. https://doi.org/10.1088/0954-3899/30/8/051