Photoproduction of <math xmlns="http://www.w3.org/1998/Math/MathML"><mi mathvariant="normal">Λ</mi></math> and <math xmlns="http://www.w3.org/1998/Math/MathML"><msup><mi mathvariant="normal">Σ</mi><mn>0</mn></msup></math> hyperons off protons with linearly polarized photons at <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msub><mi>E</mi><mi>γ</mi></msub><mo>=</mo><mn>1.5</mn><mo>–</mo><mn>3.0</mn></mrow></math> GeV

LEPS Collaboration; S. H. Shiu; H. Kohri; W. C. Chang; D. S. Ahn; J. K. Ahn; J. Y. Chen; S. Daté; H. Ejiri; H. Fujimura; M. Fujiwara; S. Fukui; W. Gohn; K. Hicks; T. Hotta; S. H. Hwang; K. Imai; T. Ishikawa; K. Joo; Y. Kato; Y. Kon; H. S. Lee; Y. Maeda; T. Mibe; M. Miyabe; K. Mizutani; Y. Morino; N. Muramatsu; T. Nakano; Y. Nakatsugawa; M. Niiyama; H. Noumi; Y. Ohashi; T. Ohta; M. Oka; J. D. Parker; C. Rangacharyulu; S. Y. Ryu; T. Sawada; H. Shimizu; Y. Sugaya; M. Sumihama; T. Tsunemi; M. Uchida; M. Ungaro; M. Yosoi

doi:10.1103/PhysRevC.97.015208

Photoproduction of $Λ$ and $Σ^{0}$ hyperons off protons with linearly polarized photons at $E_{γ} = 1.5 - 3.0$ GeV

S. H. Shiu^1,2, H. Kohri^3,1, W. C. Chang¹, D. S. Ahn⁴, J. K. Ahn⁵, J. Y. Chen⁶, S. Daté⁷, H. Ejiri³, H. Fujimura⁸ et al. (LEPS Collaboration)

H. Fujimura⁸, M. Fujiwara^3,9, S. Fukui³, W. Gohn¹⁰, K. Hicks¹¹, T. Hotta³, S. H. Hwang¹², K. Imai¹³, T. Ishikawa¹⁴, K. Joo¹⁰, Y. Kato¹⁵, Y. Kon³, H. S. Lee¹⁶, Y. Maeda¹⁷, T. Mibe¹⁸, M. Miyabe¹⁴, K. Mizutani¹⁹, Y. Morino¹⁸, N. Muramatsu¹⁴, T. Nakano³, Y. Nakatsugawa²⁰, M. Niiyama¹⁹, H. Noumi³, Y. Ohashi⁷, T. Ohta²¹, M. Oka³, J. D. Parker²², C. Rangacharyulu²³, S. Y. Ryu³, T. Sawada²⁴, H. Shimizu¹⁴, Y. Sugaya³, M. Sumihama²⁵, T. Tsunemi²⁶, M. Uchida²⁷, M. Ungaro¹⁰, and M. Yosoi³ (LEPS Collaboration)

¹Institute of Physics, Academia Sinica, Taipei 11529, Taiwan
²Department of Physics, National Central University, Taoyuan City 32001, Taiwan
³Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
⁴RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
⁵Department of Physics, Korea University, Seoul 02841, Republic of Korea
⁶Light Source Division, National Synchrotron Radiation Research Center, Hsinchu, 30076, Taiwan
⁷Japan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5143, Japan
⁸Wakayama Medical College, Wakayama, 641-8509, Japan
⁹National Institutes for Quantum and Radiological Science and Technology, Tokai, Ibaraki 319-1195, Japan
¹⁰Department of Physics, University of Connecticut, Storrs, Connecticut 06269-3046, USA
¹¹Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA
¹²Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, Republic of Korea
¹³Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
¹⁴Research Center for Electron Photon Science, Tohoku University, Sendai, Miyagi 982-0826, Japan
¹⁵Kobayashi-Maskawa Institute, Nagoya University, Nagoya, Aichi 464-8602, Japan
¹⁶Rare Isotope Science Project, Institute for Basic Science, Daejeon 34047, Korea
¹⁷Proton Therapy Center, Fukui Prefectural Hospital, Fukui 910-8526, Japan
¹⁸High Energy Accelerator Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan
¹⁹Department of Physics, Kyoto University, Kyoto 606-8502, Japan
²⁰Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
²¹Department of Radiology, The University of Tokyo Hospital, Tokyo 113-8655, Japan
²²Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), Tokai, Ibaraki 319-1106, Japan
²³Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, SK S7N 5E2, Canada
²⁴Physics Department, University of Michigan, Michigan 48109-1040, USA
²⁵Department of Education, Gifu University, Gifu 501-1193, Japan
²⁶Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
²⁷Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan

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Phys. Rev. C 97, 015208 – Published 31 January, 2018

DOI: https://doi.org/10.1103/PhysRevC.97.015208

Abstract

We report the measurement of the $γ p \to K^{+} Λ$ and $γ p \to K^{+} Σ^{0}$ 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 $E_{γ} = 1.5 - 3.0$ GeV. With increasing photon energy, the cross sections for both $γ p \to K^{+} Λ$ and $γ p \to K^{+} Σ^{0}$ reactions decrease slowly. Distinct narrow structures in the production cross section have not been found at $E_{γ} = 1.5 - 3.0$ 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 $Σ^{0}$ 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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Physical Review C

Photoproduction of $Λ$ and $Σ^{0}$ hyperons off protons with linearly polarized photons at $E_{γ} = 1.5 - 3.0$ GeV

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

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Photoproduction of $Λ$ and $Σ^{0}$ hyperons off protons with linearly polarized photons at $E_{γ} = 1.5 - 3.0$ GeV