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. Sasaki; H. D. Sato; M. Sekimoto; T. Tabaru; K. H. Tanaka; M. Togawa; S. Yamada; S. Yokkaichi; Y. Yoshimura

doi:10.1088/0954-3899/30/8/051

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

SCI - Physics

Research output: Contribution to journal › Article

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 language	English
Pages (from-to)	S1023-S1026
Journal	Journal of Physics G: Nuclear and Particle Physics
Volume	30
Issue number	8
DOIs	https://doi.org/10.1088/0954-3899/30/8/051
Publication status	Published - 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

Experimental signature of in-medium mass modification of vector mesons at normal nuclear density. / 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.; Sasaki, O.; Sato, H. D.; Sekimoto, M.; Tabaru, T.; Tanaka, K. H.; Togawa, M.; Yamada, S.; Yokkaichi, S.; Yoshimura, Y.

In: Journal of Physics G: Nuclear and Particle Physics, Vol. 30, No. 8, 01.08.2004, p. S1023-S1026.

Research output: Contribution to journal › Article

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, Sasaki, O, Sato, HD, Sekimoto, M, Tabaru, T, Tanaka, KH, Togawa, M, Yamada, S, Yokkaichi, S & 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, vol. 30, no. 8, pp. S1023-S1026. https://doi.org/10.1088/0954-3899/30/8/051

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. ; Sasaki, O. ; Sato, H. D. ; Sekimoto, M. ; Tabaru, T. ; Tanaka, K. H. ; Togawa, M. ; Yamada, S. ; Yokkaichi, S. ; Yoshimura, Y. / Experimental signature of in-medium mass modification of vector mesons at normal nuclear density. In: Journal of Physics G: Nuclear and Particle Physics. 2004 ; Vol. 30, No. 8. pp. S1023-S1026.

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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.",

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T1 - Experimental signature of in-medium mass modification of vector mesons at normal nuclear density

AU - Muto, R.

AU - Chiba, J.

AU - En'yo, H.

AU - Fukao, Y.

AU - Funahashi, H.

AU - Hamagaki, H.

AU - Ieiri, M.

AU - Ishino, M.

AU - Kanda, H.

AU - Kitaguchi, M.

AU - Mihara, S.

AU - Miwa, K.

AU - Miyashita, T.

AU - Murakami, T.

AU - Nakura, T.

AU - Naruki, M.

AU - Nomachi, M.

AU - Ozawa, K.

AU - Sakuma, F.

AU - Sasaki, O.

AU - Sato, H. D.

AU - Sekimoto, M.

AU - Tabaru, T.

AU - Tanaka, K. H.

AU - Togawa, M.

AU - Yamada, S.

AU - Yokkaichi, S.

AU - Yoshimura, Y.

PY - 2004/8/1

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