Photoproduction of Λ and Σ0 hyperons off protons with linearly polarized photons at Eγ=1.5-3.0 GeV

LEPS Collaboration

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We report the measurement of the γp→K+Λ and γp→K+Σ0 reactions at SPring-8. The differential cross sections and photon-beam asymmetries are measured at forward K+ production angles using linearly polarized tagged-photon beams in the range of Eγ=1.5-3.0 GeV. With increasing photon energy, the cross sections for both γp→K+Λ and γp→K+Σ0 reactions decrease slowly. Distinct narrow structures in the production cross section have not been found at Eγ=1.5-3.0 GeV. The forward peaking in the angular distributions of cross sections, a characteristic feature of t-channel exchange, is observed for the production of Λ in the whole observed energy range. A lack of similar feature for Σ0 production reflects a less dominant role of t-channel contribution in this channel. The photon-beam asymmetries remain positive for both reactions, suggesting the dominance of K∗ exchange in the t channel. These asymmetries increase gradually with the photon energy, and have a maximum value of +0.6 for both reactions. Comparison with theoretical predictions based on the Regge trajectory in the t channel and the contributions of nucleon resonances indicates the major role of t-channel contributions as well as non-negligible effects of nucleon resonances in accounting for the reaction mechanism of hyperon photoproduction in this photon energy regime.

Original languageEnglish
Article number015208
JournalPhysical Review C
Volume97
Issue number1
DOIs
Publication statusPublished - 2018 Jan 31

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hyperons
photoproduction
protons
photon beams
photons
cross sections
asymmetry
energy
angular distribution
trajectories
predictions

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Photoproduction of Λ and Σ0 hyperons off protons with linearly polarized photons at Eγ=1.5-3.0 GeV. / LEPS Collaboration.

In: Physical Review C, Vol. 97, No. 1, 015208, 31.01.2018.

Research output: Contribution to journalArticle

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title = "Photoproduction of Λ and Σ0 hyperons off protons with linearly polarized photons at Eγ=1.5-3.0 GeV",
abstract = "We report the measurement of the γp→K+Λ and γp→K+Σ0 reactions at SPring-8. The differential cross sections and photon-beam asymmetries are measured at forward K+ production angles using linearly polarized tagged-photon beams in the range of Eγ=1.5-3.0 GeV. With increasing photon energy, the cross sections for both γp→K+Λ and γp→K+Σ0 reactions decrease slowly. Distinct narrow structures in the production cross section have not been found at Eγ=1.5-3.0 GeV. The forward peaking in the angular distributions of cross sections, a characteristic feature of t-channel exchange, is observed for the production of Λ in the whole observed energy range. A lack of similar feature for Σ0 production reflects a less dominant role of t-channel contribution in this channel. The photon-beam asymmetries remain positive for both reactions, suggesting the dominance of K∗ exchange in the t channel. These asymmetries increase gradually with the photon energy, and have a maximum value of +0.6 for both reactions. Comparison with theoretical predictions based on the Regge trajectory in the t channel and the contributions of nucleon resonances indicates the major role of t-channel contributions as well as non-negligible effects of nucleon resonances in accounting for the reaction mechanism of hyperon photoproduction in this photon energy regime.",
author = "{LEPS Collaboration} and Shiu, {S. H.} and H. Kohri and Chang, {W. C.} 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 T. Hotta and Hwang, {S. H.} and K. Imai and T. Ishikawa and K. Joo and Y. Kato and Y. Kon and Lee, {H. S.} and Y. Maeda and T. Mibe and M. Miyabe and K. Mizutani 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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T1 - Photoproduction of Λ and Σ0 hyperons off protons with linearly polarized photons at Eγ=1.5-3.0 GeV

AU - LEPS Collaboration

AU - Shiu, S. H.

AU - Kohri, H.

AU - Chang, W. C.

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 - Hotta, T.

AU - Hwang, S. H.

AU - Imai, K.

AU - Ishikawa, T.

AU - Joo, K.

AU - Kato, Y.

AU - Kon, Y.

AU - Lee, H. S.

AU - Maeda, Y.

AU - Mibe, T.

AU - Miyabe, M.

AU - Mizutani, K.

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.

PY - 2018/1/31

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N2 - We report the measurement of the γp→K+Λ and γp→K+Σ0 reactions at SPring-8. The differential cross sections and photon-beam asymmetries are measured at forward K+ production angles using linearly polarized tagged-photon beams in the range of Eγ=1.5-3.0 GeV. With increasing photon energy, the cross sections for both γp→K+Λ and γp→K+Σ0 reactions decrease slowly. Distinct narrow structures in the production cross section have not been found at Eγ=1.5-3.0 GeV. The forward peaking in the angular distributions of cross sections, a characteristic feature of t-channel exchange, is observed for the production of Λ in the whole observed energy range. A lack of similar feature for Σ0 production reflects a less dominant role of t-channel contribution in this channel. The photon-beam asymmetries remain positive for both reactions, suggesting the dominance of K∗ exchange in the t channel. These asymmetries increase gradually with the photon energy, and have a maximum value of +0.6 for both reactions. Comparison with theoretical predictions based on the Regge trajectory in the t channel and the contributions of nucleon resonances indicates the major role of t-channel contributions as well as non-negligible effects of nucleon resonances in accounting for the reaction mechanism of hyperon photoproduction in this photon energy regime.

AB - We report the measurement of the γp→K+Λ and γp→K+Σ0 reactions at SPring-8. The differential cross sections and photon-beam asymmetries are measured at forward K+ production angles using linearly polarized tagged-photon beams in the range of Eγ=1.5-3.0 GeV. With increasing photon energy, the cross sections for both γp→K+Λ and γp→K+Σ0 reactions decrease slowly. Distinct narrow structures in the production cross section have not been found at Eγ=1.5-3.0 GeV. The forward peaking in the angular distributions of cross sections, a characteristic feature of t-channel exchange, is observed for the production of Λ in the whole observed energy range. A lack of similar feature for Σ0 production reflects a less dominant role of t-channel contribution in this channel. The photon-beam asymmetries remain positive for both reactions, suggesting the dominance of K∗ exchange in the t channel. These asymmetries increase gradually with the photon energy, and have a maximum value of +0.6 for both reactions. Comparison with theoretical predictions based on the Regge trajectory in the t channel and the contributions of nucleon resonances indicates the major role of t-channel contributions as well as non-negligible effects of nucleon resonances in accounting for the reaction mechanism of hyperon photoproduction in this photon energy regime.

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