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

Journal Article · Wed Mar 15 00:00:00 EST 2006 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.73.035214· OSTI ID:20771388

Sumihama, M; Hotta, T; Kino, K; Kohri, H; Matsumura, T; Matsuoka, N; Mibe, T; Morita, M; Muramatsu, N; Nakano, T; Yosoi, M ^[1]; Ahn, J K ^[2]; Akimune, H ^[3]; Asano, Y ^[4]; Bennhold, C ^[5]; Chang, W C; Oshuev, D S; Wang, C W; Wang, S C ^[6]; Corthals, T ^[7]

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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)

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.

• OSTI ID: 20771388
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 73, Issue 3; Other Information: DOI: 10.1103/PhysRevC.73.035214; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

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