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

M. Sumihama, Jung Keun 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

Research output: Contribution to journalArticle

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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.

Original languageEnglish
Pages (from-to)32-37
Number of pages6
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume657
Issue number1-3
DOIs
Publication statusPublished - 2007 Nov 29
Externally publishedYes

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photon beams
photoproduction
mesons
asymmetry
protons
cross sections
scattering

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Backward-angle photoproduction of π0 mesons on the proton at Eγ = 1.5 - 2.4  GeV. / Sumihama, M.; Ahn, Jung Keun; 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.; 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, D. S.; Rangacharyulu, C.; Sakaguchi, A.; Sato, T.; Shagin, P. M.; Shiino, Y.; Shimizu, H.; Sugaya, Y.; Toyokawa, H.; Wakai, A.; Wang, C. W.; Wang, S. C.; Yonehara, K.; Yorita, T.; Yosoi, M.; Zegers, R. G T.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 657, No. 1-3, 29.11.2007, p. 32-37.

Research output: Contribution to journalArticle

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 Eγ = 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
Sumihama, M. ; Ahn, Jung Keun ; 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. ; 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, D. S. ; Rangacharyulu, C. ; Sakaguchi, A. ; Sato, T. ; Shagin, P. M. ; Shiino, Y. ; Shimizu, H. ; Sugaya, Y. ; Toyokawa, H. ; Wakai, A. ; Wang, C. W. ; Wang, S. C. ; Yonehara, K. ; Yorita, T. ; Yosoi, M. ; Zegers, R. G T. / Backward-angle photoproduction of π0 mesons on the proton at Eγ = 1.5 - 2.4  GeV. In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2007 ; Vol. 657, No. 1-3. pp. 32-37.
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T1 - Backward-angle photoproduction of π0 mesons on the proton at Eγ = 1.5 - 2.4  GeV

AU - Sumihama, M.

AU - Ahn, Jung Keun

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

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.

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U2 - 10.1016/j.physletb.2007.10.032

DO - 10.1016/j.physletb.2007.10.032

M3 - Article

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

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

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