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Title: The {gamma}-vectorp{yields}K{sup +}{lambda} and {gamma}-vectorp{yields}K{sup +}{sigma}{sup 0} reactions at forward angles with photon energies from 1.5 to 2.4 GeV

Abstract

Differential cross sections and photon-beam asymmetries for the {gamma}-vectorp{yields}K{sup +}{lambda} and {gamma}-vectorp{yields}K{sup +}{sigma}{sup 0} reactions have been measured in the photon energy range from 1.5 to 2.4 GeV and in the angular range from {theta}{sub c.m.}=0 deg. to 60 deg. of the K{sup +} 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 cos{theta}{sub c.m.}<0.9 within the experimental uncertainties, but the discrepancy with the SAPHIR data for the K{sup +}{lambda} reaction is large at cos{theta}{sub c.m.}>0.9. In the K{sup +}{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{sup +}{lambda} reaction, but not for the K{sup +}{sigma}{sup 0} reaction.

Authors:
; ; ; ; ; ; ; ; ; ;  [1];  [2];  [3];  [4];  [5]; ; ; ;  [6];  [7]
  1. Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047 (Japan)
  2. Department of Physics, Pusan National University, Busan 609-735, Korea (Korea, Republic of)
  3. Department of Physics, Konan University, Kobe, Hyogo 658-8501 (Japan)
  4. Synchrotron Radiation Research Center, Japan Atomic Energy Research Institute, Sayo, Hyogo 679-5198 (Japan)
  5. George Washington University, Washington, DC, 20052 (United States)
  6. Institute of Physics, Academia Sinica, Taipei, Taiwan 11529 (China)
  7. Department of Subatomic and Radiation Physics, Gent University, Proeftuinstraat 86, B-9000 Gent (Belgium) (and others)
Publication Date:
OSTI Identifier:
20771388
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 73; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevC.73.035214; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; CENTER-OF-MASS SYSTEM; DIFFERENTIAL CROSS SECTIONS; GEV RANGE; KAONS PLUS; LAMBDA BARYONS; LEP STORAGE RINGS; PHOTON BEAMS; PHOTON-PROTON INTERACTIONS; PHOTONS; POLARIZATION; RESONANCE PARTICLES; SCATTERING; SIGMA NEUTRAL PARTICLES; SPRING-8 STORAGE RING; T CHANNEL

Citation Formats

Sumihama, M., Hotta, T., Kino, K., Kohri, H., Matsumura, T., Matsuoka, N., Mibe, T., Morita, M., Muramatsu, N., Nakano, T., Yosoi, M., Ahn, J.K., Akimune, H., Asano, Y., Bennhold, C., Chang, W. C., Oshuev, D. S., Wang, C. W., Wang, S. C., and Corthals, T.. The {gamma}-vectorp{yields}K{sup +}{lambda} and {gamma}-vectorp{yields}K{sup +}{sigma}{sup 0} reactions at forward angles with photon energies from 1.5 to 2.4 GeV. United States: N. p., 2006. Web. doi:10.1103/PhysRevC.73.035214.
Sumihama, M., Hotta, T., Kino, K., Kohri, H., Matsumura, T., Matsuoka, N., Mibe, T., Morita, M., Muramatsu, N., Nakano, T., Yosoi, M., Ahn, J.K., Akimune, H., Asano, Y., Bennhold, C., Chang, W. C., Oshuev, D. S., Wang, C. W., Wang, S. C., & Corthals, T.. The {gamma}-vectorp{yields}K{sup +}{lambda} and {gamma}-vectorp{yields}K{sup +}{sigma}{sup 0} reactions at forward angles with photon energies from 1.5 to 2.4 GeV. United States. doi:10.1103/PhysRevC.73.035214.
Sumihama, M., Hotta, T., Kino, K., Kohri, H., Matsumura, T., Matsuoka, N., Mibe, T., Morita, M., Muramatsu, N., Nakano, T., Yosoi, M., Ahn, J.K., Akimune, H., Asano, Y., Bennhold, C., Chang, W. C., Oshuev, D. S., Wang, C. W., Wang, S. C., and Corthals, T.. Wed . "The {gamma}-vectorp{yields}K{sup +}{lambda} and {gamma}-vectorp{yields}K{sup +}{sigma}{sup 0} reactions at forward angles with photon energies from 1.5 to 2.4 GeV". United States. doi:10.1103/PhysRevC.73.035214.
@article{osti_20771388,
title = {The {gamma}-vectorp{yields}K{sup +}{lambda} and {gamma}-vectorp{yields}K{sup +}{sigma}{sup 0} reactions at forward angles with photon energies from 1.5 to 2.4 GeV},
author = {Sumihama, M. and Hotta, T. and Kino, K. and Kohri, H. and Matsumura, T. and Matsuoka, N. and Mibe, T. and Morita, M. and Muramatsu, N. and Nakano, T. and Yosoi, M. and Ahn, J.K. and Akimune, H. and Asano, Y. and Bennhold, C. and Chang, W. C. and Oshuev, D. S. and Wang, C. W. and Wang, S. C. and Corthals, T.},
abstractNote = {Differential cross sections and photon-beam asymmetries for the {gamma}-vectorp{yields}K{sup +}{lambda} and {gamma}-vectorp{yields}K{sup +}{sigma}{sup 0} reactions have been measured in the photon energy range from 1.5 to 2.4 GeV and in the angular range from {theta}{sub c.m.}=0 deg. to 60 deg. of the K{sup +} 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 cos{theta}{sub c.m.}<0.9 within the experimental uncertainties, but the discrepancy with the SAPHIR data for the K{sup +}{lambda} reaction is large at cos{theta}{sub c.m.}>0.9. In the K{sup +}{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{sup +}{lambda} reaction, but not for the K{sup +}{sigma}{sup 0} reaction.},
doi = {10.1103/PhysRevC.73.035214},
journal = {Physical Review. C, Nuclear Physics},
number = 3,
volume = 73,
place = {United States},
year = {Wed Mar 15 00:00:00 EST 2006},
month = {Wed Mar 15 00:00:00 EST 2006}
}