Backward-angle photoproduction of π0 mesons on the proton at Eγ = 1.5 - 2.4  GeV

M. Sumihama; J. K. Ahn; H. Akimune; Y. Asano; W. C. Chang; S. Daté; H. Ejiri; H. Fujimura; M. Fujiwara; K. Hicks; T. Hotta; K. Imai; T. Ishikawa; T. Iwata; H. Kawai; Z. Y. Kim; K. Kino; H. Kohri; N. Kumagai; S. Makino; T. Matsumura; N. Matsuoka; T. Mibe; M. Miyabe; Y. Miyachi; M. Morita; N. Muramatsu; T. Nakano; M. Niiyama; M. Nomachi; Y. Ohashi; H. Ohkuma; T. Ooba; D. S. Oshuev; C. Rangacharyulu; A. Sakaguchi; T. Sato; P. M. Shagin; Y. Shiino; H. Shimizu; Y. Sugaya; H. Toyokawa; A. Wakai; C. W. Wang; S. C. Wang; K. Yonehara; T. Yorita; M. Yosoi; R. G.T. Zegers

doi:10.1016/j.physletb.2007.10.032

Backward-angle photoproduction of π⁰ mesons on the proton at E_γ = 1.5 - 2.4 GeV

M. Sumihama, J. K. Ahn, H. Akimune, Y. Asano, W. C. Chang, S. Daté, H. Ejiri, H. Fujimura, M. Fujiwara, K. Hicks, T. Hotta, K. Imai, T. Ishikawa, T. Iwata, H. Kawai, Z. Y. Kim, K. Kino, H. Kohri, N. Kumagai, S. MakinoT. Matsumura, N. Matsuoka, T. Mibe, M. Miyabe, Y. Miyachi, M. Morita, N. Muramatsu, T. Nakano, M. Niiyama, M. Nomachi, Y. Ohashi, H. Ohkuma, T. Ooba, D. S. Oshuev, C. Rangacharyulu, A. Sakaguchi, T. Sato, P. M. Shagin, Y. Shiino, H. Shimizu, Y. Sugaya, H. Toyokawa, A. Wakai, C. W. Wang, S. C. Wang, K. Yonehara, T. Yorita, M. Yosoi, R. G.T. Zegers

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Abstract

Differential cross sections and photon beam asymmetries for π⁰ photoproduction have been measured at E_γ = 1.5 - 2.4 GeV and at the π⁰ scattering angles, - 1 < cos Θ_{c . m .} < - 0.6. The energy-dependence of differential cross sections for u-channel π⁰ production has been determined. An enhancement at backward angles is found above E_γ = 1.9 GeV. This is likely to be due to u-channel diagrams. Photon beam asymmetries have been obtained for the first time at backward angles, showing a strong angular dependence at E_γ > 2.0 GeV.

Original language	English
Pages (from-to)	32-37
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	657
Issue number	1-3
DOIs	https://doi.org/10.1016/j.physletb.2007.10.032
Publication status	Published - 2007 Nov 29
Externally published	Yes

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1016/j.physletb.2007.10.032

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Sumihama, M., Ahn, J. K., Akimune, H., Asano, Y., Chang, W. C., Daté, S., Ejiri, H., Fujimura, H., Fujiwara, M., Hicks, K., Hotta, T., Imai, K., Ishikawa, T., Iwata, T., Kawai, H., Kim, Z. Y., Kino, K., Kohri, H., Kumagai, N., ... Zegers, R. G. T. (2007). Backward-angle photoproduction of π⁰ mesons on the proton at E_γ = 1.5 - 2.4 GeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 657(1-3), 32-37. https://doi.org/10.1016/j.physletb.2007.10.032

Sumihama, M, Ahn, JK, Akimune, H, Asano, Y, Chang, WC, Daté, S, Ejiri, H, Fujimura, H, Fujiwara, M, Hicks, K, Hotta, T, Imai, K, Ishikawa, T, Iwata, T, Kawai, H, Kim, ZY, Kino, K, Kohri, H, Kumagai, N, Makino, S, Matsumura, T, Matsuoka, N, Mibe, T, Miyabe, M, Miyachi, Y, Morita, M, Muramatsu, N, Nakano, T, Niiyama, M, Nomachi, M, Ohashi, Y, Ohkuma, H, Ooba, T, Oshuev, DS, Rangacharyulu, C, Sakaguchi, A, Sato, T, Shagin, PM, Shiino, Y, Shimizu, H, Sugaya, Y, Toyokawa, H, Wakai, A, Wang, CW, Wang, SC, Yonehara, K, Yorita, T, Yosoi, M & Zegers, RGT 2007, 'Backward-angle photoproduction of π⁰ mesons on the proton at E_γ = 1.5 - 2.4 GeV', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 657, no. 1-3, pp. 32-37. https://doi.org/10.1016/j.physletb.2007.10.032

@article{f704abc10e4743f0bc222b588b756a66,

title = "Backward-angle photoproduction of π0 mesons on the proton at Eγ = 1.5 - 2.4 GeV",

abstract = "Differential cross sections and photon beam asymmetries for π0 photoproduction have been measured at Eγ = 1.5 - 2.4 GeV and at the π0 scattering angles, - 1 < cos Θc . m . < - 0.6. The energy-dependence of differential cross sections for u-channel π0 production has been determined. An enhancement at backward angles is found above Eγ = 1.9 GeV. This is likely to be due to u-channel diagrams. Photon beam asymmetries have been obtained for the first time at backward angles, showing a strong angular dependence at Eγ > 2.0 GeV.",

author = "M. Sumihama and Ahn, {J. K.} and H. Akimune and Y. Asano and Chang, {W. C.} and S. Dat{\'e} and H. Ejiri and H. Fujimura and M. Fujiwara and K. Hicks and T. Hotta and K. Imai and T. Ishikawa and T. Iwata and H. Kawai and Kim, {Z. Y.} and K. Kino and H. Kohri and N. Kumagai and S. Makino and T. Matsumura and N. Matsuoka and T. Mibe and M. Miyabe and Y. Miyachi and M. Morita and N. Muramatsu and T. Nakano and M. Niiyama and M. Nomachi and Y. Ohashi and H. Ohkuma and T. Ooba and Oshuev, {D. S.} and C. Rangacharyulu and A. Sakaguchi and T. Sato and Shagin, {P. M.} and Y. Shiino and H. Shimizu and Y. Sugaya and H. Toyokawa and A. Wakai and Wang, {C. W.} and Wang, {S. C.} and K. Yonehara and T. Yorita and M. Yosoi and Zegers, {R. G.T.}",

note = "Funding Information: We thank the staff at SPring-8 for providing excellent experimental conditions during the long experiment. This research was supported in part by the Ministry of Education, Science, Sports and Culture of Japan, by the National Science Council of the Republic of China (Taiwan), and by the National Science Foundation (USA).",

year = "2007",

month = nov,

day = "29",

doi = "10.1016/j.physletb.2007.10.032",

language = "English",

volume = "657",

pages = "32--37",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

number = "1-3",

}

TY - JOUR

T1 - Backward-angle photoproduction of π0 mesons on the proton at Eγ = 1.5 - 2.4 GeV

AU - Sumihama, M.

AU - Ahn, J. K.

AU - Akimune, H.

AU - Asano, Y.

AU - Chang, W. C.

AU - Daté, S.

AU - Ejiri, H.

AU - Fujimura, H.

AU - Fujiwara, M.

AU - Hicks, K.

AU - Hotta, T.

AU - Imai, K.

AU - Ishikawa, T.

AU - Iwata, T.

AU - Kawai, H.

AU - Kim, Z. Y.

AU - Kino, K.

AU - Kohri, H.

AU - Kumagai, N.

AU - Makino, S.

AU - Matsumura, T.

AU - Matsuoka, N.

AU - Mibe, T.

AU - Miyabe, M.

AU - Miyachi, Y.

AU - Morita, M.

AU - Muramatsu, N.

AU - Nakano, T.

AU - Niiyama, M.

AU - Nomachi, M.

AU - Ohashi, Y.

AU - Ohkuma, H.

AU - Ooba, T.

AU - Oshuev, D. S.

AU - Rangacharyulu, C.

AU - Sakaguchi, A.

AU - Sato, T.

AU - Shagin, P. M.

AU - Shiino, Y.

AU - Shimizu, H.

AU - Sugaya, Y.

AU - Toyokawa, H.

AU - Wakai, A.

AU - Wang, C. W.

AU - Wang, S. C.

AU - Yonehara, K.

AU - Yorita, T.

AU - Yosoi, M.

AU - Zegers, R. G.T.

N1 - Funding Information: We thank the staff at SPring-8 for providing excellent experimental conditions during the long experiment. This research was supported in part by the Ministry of Education, Science, Sports and Culture of Japan, by the National Science Council of the Republic of China (Taiwan), and by the National Science Foundation (USA).

PY - 2007/11/29

Y1 - 2007/11/29

N2 - Differential cross sections and photon beam asymmetries for π0 photoproduction have been measured at Eγ = 1.5 - 2.4 GeV and at the π0 scattering angles, - 1 < cos Θc . m . < - 0.6. The energy-dependence of differential cross sections for u-channel π0 production has been determined. An enhancement at backward angles is found above Eγ = 1.9 GeV. This is likely to be due to u-channel diagrams. Photon beam asymmetries have been obtained for the first time at backward angles, showing a strong angular dependence at Eγ > 2.0 GeV.

AB - Differential cross sections and photon beam asymmetries for π0 photoproduction have been measured at Eγ = 1.5 - 2.4 GeV and at the π0 scattering angles, - 1 < cos Θc . m . < - 0.6. The energy-dependence of differential cross sections for u-channel π0 production has been determined. An enhancement at backward angles is found above Eγ = 1.9 GeV. This is likely to be due to u-channel diagrams. Photon beam asymmetries have been obtained for the first time at backward angles, showing a strong angular dependence at Eγ > 2.0 GeV.

UR - http://www.scopus.com/inward/record.url?scp=36048946674&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2007.10.032

DO - 10.1016/j.physletb.2007.10.032

M3 - Article

AN - SCOPUS:36048946674

SN - 0370-2693

VL - 657

SP - 32

EP - 37

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 1-3

ER -

Backward-angle photoproduction of π⁰ mesons on the proton at E_γ = 1.5 - 2.4 GeV

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