Nuclear-matter modification of decay widths in the →e+e- and →k+K- Channels

F. Sakuma; 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; R. Muto; T. Nakura; M. Naruki; K. Ozawa; O. Sasaki; M. Sekimoto; T. Tabaru; K. H. Tanaka; M. Togawa; S. Yamada; S. Yokkaichi; Y. Yoshimura

doi:10.1103/PhysRevLett.98.152302

Nuclear-matter modification of decay widths in the →e+e- and →k+K- Channels

F. Sakuma, 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, R. Muto, T. Nakura, M. Naruki, K. Ozawa, O. Sasaki, M. SekimotoT. Tabaru, K. H. Tanaka, M. Togawa, S. Yamada, S. Yokkaichi, Y. Yoshimura

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13 Citations (Scopus)

Abstract

The invariant mass spectra of →K+K- are measured in 12 GeV p+A reactions in order to search for the in-medium modification of mesons. The observed K+K- spectra are well reproduced by the relativistic Breit-Wigner function with a combinatorial background shape in three βγ regions between 1.0 and 3.5. The nuclear mass number dependence of the yields of the K+K- decay channel is compared to the simultaneously measured e+e- decay channel for carbon and copper targets. We parameterize the production yields as σ(A)=σ0Aα and obtain α →K+K - α →e+e- to be 0.14±0.12. Limits are obtained for the partial decay widths of the mesons in nuclear matter.

Original language	English
Article number	152302
Journal	Physical review letters
Volume	98
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevLett.98.152302
Publication status	Published - 2007 Apr 13
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.1103/PhysRevLett.98.152302

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Sakuma, F., 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., Muto, R., Nakura, T., Naruki, M., Ozawa, K., Sasaki, O., ... Yoshimura, Y. (2007). Nuclear-matter modification of decay widths in the →e+e- and →k+K- Channels. Physical review letters, 98(15), [152302]. https://doi.org/10.1103/PhysRevLett.98.152302

Sakuma, F, 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, Muto, R, Nakura, T, Naruki, M, Ozawa, K, Sasaki, O, Sekimoto, M, Tabaru, T, Tanaka, KH, Togawa, M, Yamada, S, Yokkaichi, S & Yoshimura, Y 2007, 'Nuclear-matter modification of decay widths in the →e+e- and →k+K- Channels', Physical review letters, vol. 98, no. 15, 152302. https://doi.org/10.1103/PhysRevLett.98.152302

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title = "Nuclear-matter modification of decay widths in the →e+e- and →k+K- Channels",

abstract = "The invariant mass spectra of →K+K- are measured in 12 GeV p+A reactions in order to search for the in-medium modification of mesons. The observed K+K- spectra are well reproduced by the relativistic Breit-Wigner function with a combinatorial background shape in three βγ regions between 1.0 and 3.5. The nuclear mass number dependence of the yields of the K+K- decay channel is compared to the simultaneously measured e+e- decay channel for carbon and copper targets. We parameterize the production yields as σ(A)=σ0Aα and obtain α →K+K - α →e+e- to be 0.14±0.12. Limits are obtained for the partial decay widths of the mesons in nuclear matter.",

author = "F. Sakuma and J. Chiba and H. En'Yo and Y. Fukao and H. Funahashi and H. Hamagaki and M. Ieiri and M. Ishino and H. Kanda and M. Kitaguchi and S. Mihara and K. Miwa and T. Miyashita and T. Murakami and R. Muto and T. Nakura and M. Naruki and K. Ozawa and O. Sasaki and M. Sekimoto and T. Tabaru and Tanaka, {K. H.} and M. Togawa and S. Yamada and S. Yokkaichi and Y. Yoshimura",

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T1 - Nuclear-matter modification of decay widths in the →e+e- and →k+K- Channels

AU - Sakuma, F.

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 - Muto, R.

AU - Nakura, T.

AU - Naruki, M.

AU - Ozawa, K.

AU - Sasaki, O.

AU - Sekimoto, M.

AU - Tabaru, T.

AU - Tanaka, K. H.

AU - Togawa, M.

AU - Yamada, S.

AU - Yokkaichi, S.

AU - Yoshimura, Y.

PY - 2007/4/13

Y1 - 2007/4/13

N2 - The invariant mass spectra of →K+K- are measured in 12 GeV p+A reactions in order to search for the in-medium modification of mesons. The observed K+K- spectra are well reproduced by the relativistic Breit-Wigner function with a combinatorial background shape in three βγ regions between 1.0 and 3.5. The nuclear mass number dependence of the yields of the K+K- decay channel is compared to the simultaneously measured e+e- decay channel for carbon and copper targets. We parameterize the production yields as σ(A)=σ0Aα and obtain α →K+K - α →e+e- to be 0.14±0.12. Limits are obtained for the partial decay widths of the mesons in nuclear matter.

AB - The invariant mass spectra of →K+K- are measured in 12 GeV p+A reactions in order to search for the in-medium modification of mesons. The observed K+K- spectra are well reproduced by the relativistic Breit-Wigner function with a combinatorial background shape in three βγ regions between 1.0 and 3.5. The nuclear mass number dependence of the yields of the K+K- decay channel is compared to the simultaneously measured e+e- decay channel for carbon and copper targets. We parameterize the production yields as σ(A)=σ0Aα and obtain α →K+K - α →e+e- to be 0.14±0.12. Limits are obtained for the partial decay widths of the mesons in nuclear matter.

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Nuclear-matter modification of decay widths in the →e+e- and →k+K- Channels

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