Phys. Rev. C
76,
042201(R)
(2007)
[6 pages]
Measurement of the γ⃗p→K+Λ reaction at backward angles
K. Hicks et al. LEPS Collaboration
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K. Hicks1, T. Mibe1, M. Sumihama2, D. S. Ahn2,3, J. K. Ahn3, H. Akimune4, Y. Asano5, W. C. Chang6, S. Daté7, H. Ejiri2,7, S. Fukui8, H. Fujimura9,10, M. Fujiwara2,11, S. Hasegawa2, A. Hosaka2, T. Hotta2, K. Imai9, T. Ishikawa12,9, T. Iwata13, B. Juliá-Díaz14, Y. Kato2, H. Kawai15, Z. Y. Kim10, K. Kino2,*, H. Kohri2, N. Kumagai7, T.-S. H. Lee16, S. Makino17, T. Matsuda18, T. Matsumura19, N. Matsuoka2, M. Miyabe9, Y. Miyachi8,†, M. Morita2, N. Muramatsu2, T. Nakano2, M. Niiyama9, M. Nomachi20, Y. Ohashi7, T. Ooba15, H. Ohkuma7, D. S. Oshuev6, S. Ozaki2, C. Rangacharyulu21, A. Sakaguchi20, T. Sasaki9, P. M. Shagin2,‡, Y. Shiino15, A. Shimizu2, H. Shimizu12, Y. Sugaya20,22, Y. Toi18, H. Toyokawa7, A. Wakai23,§, C. W. Wang6, S. C. Wang6,**, K. Yonehara4,††, T. Yorita7, M. Yoshimura24, M. Yosoi2,9, and R. G. T. Zegers25 (LEPS Collaboration)
1Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701, USA 2Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan 3Department of Physics, Pusan National University, Busan 609-735, Korea 4Department of Physics, Konan University, Kobe, Hyogo 658-8501, Japan 5Synchrotron Radiation Research Center, Japan Atomic Energy Research Institute, Mikazuki, Hyogo 679-5198, Japan 6Institute of Physics, Academia Sinica, Taipei 11529, Taiwan 7Japan Synchrotron Radiation Research Institute, Mikazuki, Hyogo 679-5198, Japan 8Department of Physics and Astrophysics, Nagoya University, Nagoya, Aichi 464-8602, Japan 9Department of Physics, Kyoto University, Kyoto 606-8502, Japan 10School of Physics, Seoul National University, Seoul 151-747, Korea 11Kansai Photon Science Institute, Japan Atomic Energy Agency, Kizu, Kyoto 619-0215, Japan 12Laboratory of Nuclear Science, Tohoku University, Sendai, Miyagi 982-0826, Japan 13Department of Physics, Yamagata University, Yamagata 990-8560, Japan 14Departament de Estructura i Constituents de la Materia, Diagonal 647, 08028 Barcelona, Spain 15Department of Physics, Chiba University, Chiba 263-8522, Japan 16Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA 17Wakayama Medical University, Wakayama 641-8509, Japan 18Department of Applied Physics, Miyazaki University, Miyazaki 889-2192, Japan 19Department of Applied Physics, National Defense Academy, Yokosuka 239-8686, Japan 20Department of Physics, Osaka University, Toyonaka, Osaka 560-0043, Japan 21Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5E2 22Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan 23Center for Integrated Research in Science and Engineering, Nagoya University, Nagoya, Aichi 464-8603, Japan 24Institute for Protein Research, Osaka University, Suita, Osaka 565-0871, Japan 25National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824-1321, USA
Received 30 July 2007; published 30 October 2007
Cross sections for the γp→K+Λ reaction were measured at backward angles using linearly polarized photons in the range 1.50 to 2.37 GeV. In addition, the beam asymmetry for this reaction was measured for the first time at backward angles. The Λ was detected at forward angles in the LEPS spectrometer via its decay to pπ- and the K+ was inferred using the technique of missing mass. These measurements, corresponding to kaons at far backward angles in the center-of-mass frame, complement similar CLAS data at other angles. Comparison with theoretical models shows that the reactions in these kinematics provide further opportunities to investigate the reaction mechanisms of hadron dynamics.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevC.76.042201
DOI:
10.1103/PhysRevC.76.042201
PACS:
24.85.+p, 13.60.Le, 24.70.+s, 25.20.Lj
*Present address: Center for Nuclear Study, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, Japan. †Present address: Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551, Japan. ‡Present address: Department of Physics and Astronomy, Rice University, 6100 Main St., Houston MS 108, TX 77005-1892, USA. §Present address: Akita Research Institute of Brain and Blood Vessels, Akita 010-0874, Japan. **Present address: Institute of Statistical Science, Academia Sinica, Nankang, 115 Taipei, Taiwan. ††Present address: Illinois Institute of Technology, Chicago, IL 60616, USA.
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