Differential cross section and photon-beam asymmetry for the γ - p→π+n reaction at forward π+ angles at Eγ=1.5 -2.95 GeV

LEPS Collaboration

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Differential cross sections and photon-beam asymmetries for the γ - p→π+n reaction have been measured for 0.6<cosθπ<1 and Eγ=1.5-2.95GeV at SPring-8/LEPS. The cross sections monotonically decrease as the photon beam energy increases for 0.6<cosθπ<0.9. However, the energy dependence of the cross sections for 0.9<cosθπ<1 and Eγ=1.5-2.2GeV (W=1.9-2.2GeV) is different, which may be due to a nucleon or Δ resonance. The present cross sections agree well with the previous cross sections measured by other groups and show forward peaking, suggesting significant t-channel contributions in this kinematical region. The asymmetries are found to be positive, which can be explained by ρ exchange in the t channel. Large positive asymmetries in the small-|t| region, where the ρ-exchange contribution becomes small, could be explained by introducing π-exchange interference with the s channel.

Original languageEnglish
Article number015205
JournalPhysical Review C
Volume97
Issue number1
DOIs
Publication statusPublished - 2018 Jan 22

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photon beams
asymmetry
cross sections
interference
energy

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Differential cross section and photon-beam asymmetry for the γ - p→π+n reaction at forward π+ angles at Eγ=1.5 -2.95 GeV. / LEPS Collaboration.

In: Physical Review C, Vol. 97, No. 1, 015205, 22.01.2018.

Research output: Contribution to journalArticle

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abstract = "Differential cross sections and photon-beam asymmetries for the γ - p→π+n reaction have been measured for 0.6",
author = "{LEPS Collaboration} and H. Kohri and Wang, {S. Y.} and Shiu, {S. H.} and Chang, {W. C.} and Y. Yanai and Ahn, {D. S.} and Ahn, {Jung Keun} and Chen, {J. Y.} and S. Dat{\'e} and H. Ejiri and H. Fujimura and M. Fujiwara and S. Fukui and W. Gohn and K. Hicks and A. Hosaka and T. Hotta and Hwang, {S. H.} and K. Imai and T. Ishikawa and K. Joo and Y. Kato and Kim, {S. H.} and Y. Kon and Lee, {H. S.} and Y. Maeda and T. Mibe and M. Miyabe and Y. Morino and N. Muramatsu and T. Nakano and Y. Nakatsugawa and M. Niiyama and H. Noumi and Y. Ohashi and T. Ohta and M. Oka and Parker, {J. D.} and C. Rangacharyulu and Ryu, {S. Y.} and T. Sawada and H. Shimizu and Y. Sugaya and M. Sumihama and T. Tsunemi and M. Uchida and M. Ungaro and M. Yosoi",
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AU - Kohri, H.

AU - Wang, S. Y.

AU - Shiu, S. H.

AU - Chang, W. C.

AU - Yanai, Y.

AU - Ahn, D. S.

AU - Ahn, Jung Keun

AU - Chen, J. Y.

AU - Daté, S.

AU - Ejiri, H.

AU - Fujimura, H.

AU - Fujiwara, M.

AU - Fukui, S.

AU - Gohn, W.

AU - Hicks, K.

AU - Hosaka, A.

AU - Hotta, T.

AU - Hwang, S. H.

AU - Imai, K.

AU - Ishikawa, T.

AU - Joo, K.

AU - Kato, Y.

AU - Kim, S. H.

AU - Kon, Y.

AU - Lee, H. S.

AU - Maeda, Y.

AU - Mibe, T.

AU - Miyabe, M.

AU - Morino, Y.

AU - Muramatsu, N.

AU - Nakano, T.

AU - Nakatsugawa, Y.

AU - Niiyama, M.

AU - Noumi, H.

AU - Ohashi, Y.

AU - Ohta, T.

AU - Oka, M.

AU - Parker, J. D.

AU - Rangacharyulu, C.

AU - Ryu, S. Y.

AU - Sawada, T.

AU - Shimizu, H.

AU - Sugaya, Y.

AU - Sumihama, M.

AU - Tsunemi, T.

AU - Uchida, M.

AU - Ungaro, M.

AU - Yosoi, M.

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