Статья

The<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mover accent="true"><mml:mrow><mml:mi>γ</mml:mi></mml:mrow><mml:mrow><mml:mrow/><mml:mi>→</mml:mi></mml:mrow></mml:mover><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>K</mml:mi><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:mi>Λ</mml:mi></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mover accent="true"><mml:mrow><mml:mi>γ</mml:mi></mml:mrow><mml:mrow><mml:mrow/><mml:mi>→</mml:mi></mml:mrow></mml:mover><mml:mi>p</mml:mi><mml:mo>→</mml:mo><mml:msup><mml:mi>K</mml:mi><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:msup><mml:mi>Σ</mml:mi><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>reactions at forward angles with photon energies from 1.5 to 2.4 GeV

M. SumihamaResearch Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, JapanJ. K. AhnDepartment of Physics, Pusan National University, Busan 609-735, KoreaH. AkimuneDepartment of Physics, Konan University, Kobe, Hyogo 658-8501, JapanY. AsanoSynchrotron Radiation Research Center, Japan Atomic Energy Research Institute, Sayo, Hyogo 679-5198, JapanC. BennholdThe George Washington University, Washington, D.C., 20052, USAW. C. ChangInstitute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of ChinaT. CorthalsDepartment of Subatomic and Radiation Physics, Gent University, Proeftuinstraat 86, B-9000 Gent, BelgiumS. DatéJapan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, JapanH. EjiriJapan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, JapanH. FujimuraDepartment of Physics, Kyoto University, Kyoto 606-8502, JapanM̄. FujiwaraKansai Photon Science Institute, Japan Atomic Energy Agency, Kizu, Kyoto 619-215, JapanM. GuidalInstitut de Physique, Nucléaire d'Orsay, F-91406 Orsay, FranceK. HicksDepartment of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USAT. HottaResearch Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, JapanK. ImaiDepartment of Physics, Kyoto University, Kyoto 606-8502, JapanT. IshikawaLaboratory of Nuclear Science, Tohoku University, Sendai, Miyagi 982-0826, JapanT. IwataDepartment of Physics, Yamagata University, Yamagata 990-8560, JapanH. KawaiDepartment of Physics, Chiba University, Chiba 263-8522, JapanZ. Y. KimSchool of Physics, Seoul National University, Seoul, 151-747, KoreaK. KinoResearch Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, JapanH. KohriResearch Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, JapanN. KumagaiJapan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, JapanShoji MakinoT. MartDepartemen Fisika, FMIPA, Universitas Indonesia, Depok 16424, IndonesiaT. MatsumuraResearch Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, JapanN. MatsuokaResearch Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, JapanT. MibeResearch Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, JapanM. MiyabeDepartment of Physics, Kyoto University, Kyoto 606-8502, JapanY. MiyachiDepartment of Physics, Tokyo Institute of Technology, Tokyo 152-8551, JapanMasato MoritaResearch Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, JapanN. MuramatsuResearch Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, JapanT. NakanoResearch Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, JapanM. NiiyamaDepartment of Physics, Kyoto University, Kyoto 606-8502, JapanM. NomachiDepartment of Physics, Osaka University, Toyonaka, Osaka 560-0043, JapanYoji OhashiJapan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, JapanT. OobaDepartment of Physics, Chiba University, Chiba 263-8522, JapanH. OhkumaJapan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, JapanD. S. OshuevInstitute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of ChinaC. RangacharyuluDepartment of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan, Canada, S7N 5E2A. SakaguchiDepartment of Physics, Osaka University, Toyonaka, Osaka 560-0043, JapanT. SasakiDepartment of Physics, Kyoto University, Kyoto 606-8502, JapanP. ShaginSchool of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USAY. ShiinoDepartment of Physics, Chiba University, Chiba 263-8522, JapanH. ShimizuLaboratory of Nuclear Science, Tohoku University, Sendai, Miyagi 982-0826, JapanY. SugayaDepartment of Physics, Osaka University, Toyonaka, Osaka 560-0043, JapanH. ToyokawaJapan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, JapanA. WakaiAkita Research Institute of Brain and Blood Vessels, Akita 010-0874, JapanC. W. WangInstitute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of ChinaS. C. WangInstitute of Physics, Academia Sinica, Taipei, Taiwan 11529, Republic of ChinaK. YoneharaIllinois Institute of Technology, Chicago, Illinois 60616, USAT. YoritaJapan Synchrotron Radiation Research Institute, Sayo, Hyogo 679-5198, JapanM. YosoiResearch Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, JapanR. G. T. ZegersNational Superconducting Cyclotron Laboratory (NSCL), Michigan State University, Michigan 48824-1321, USA

2006lv

ABI

Аннотация

Differential cross sections and photon-beam asymmetries for the $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}}p\ensuremath{\rightarrow}{K}^{+}\ensuremath{\Lambda}$ and $\stackrel{\ensuremath{\rightarrow}}{\ensuremath{\gamma}}p\ensuremath{\rightarrow}{K}^{+}{\ensuremath{\Sigma}}^{0}$ reactions have been measured in the photon energy range from 1.5 to 2.4 GeV and in the angular range from ${\ensuremath{\Theta}}_{c.m.}={0}^{\ifmmode^\circ\else\textdegree\fi{}}$ to 60${}^{\ifmmode^\circ\else\textdegree\fi{}}$ of the ${K}^{+}$ scattering angle in the center-of-mass system at the SPring-8/LEPS facility. The photon-beam asymmetries for both the reactions have been found to be positive and to increase with the photon energy. The measured differential cross sections agree with the data measured by the CLAS Collaboration at $\mathrm{cos}{\ensuremath{\Theta}}_{c.m.}<0.9$ within the experimental uncertainties, but the discrepancy with the SAPHIR data for the ${K}^{+}\ensuremath{\Lambda}$ reaction is large at $\mathrm{cos}{\ensuremath{\Theta}}_{c.m.}>0.9$. In the ${K}^{+}\ensuremath{\Lambda}$ reaction, the resonance-like structure found in the CLAS and SAPHIR data at $W=1.96$ GeV is confirmed. The differential cross sections at forward angles suggest a strong K-exchange contribution in the t-channel for the ${K}^{+}\ensuremath{\Lambda}$ reaction, but not for the ${K}^{+}{\ensuremath{\Sigma}}^{0}$ reaction.

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Идентификаторы

DOI: 10.1103/physrevc.73.035214

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Цитирований: 2Использованных источников: 0

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