Photoproduction of {lambda}(1405) and {sigma}{sup 0}(1385) on the proton at E{sub {gamma}}=1.5-2.4 GeV

Journal Article · Mon Sep 15 00:00:00 EDT 2008 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.78.035202· OSTI ID:21192236

Niiyama, M; Fujimura, H; Imai, K; Miyabe, M; Nakatsugawa, Y; Parker, J D ^[1]; Ahn, D S; Ajimura, S; Hotta, T; Kato, Y; Kino, K; Kohri, H; Muramatsu, N; Nakano, T; Sawada, T; Sumihama, M; Yorita, T; Yosoi, M ^[2]; Ahn, J K ^[3]; Bhang, H C ^[4]

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1. Department of Physics, Kyoto University, Kyoto 606-8502 (Japan)
2. Research Center for Nuclear Physics, Osaka University, Ibaraki 567-0047 (Japan)
3. Department of Physics, Pusan National University, Busan 609-735 (Korea, Republic of)
4. School of Physics, Seoul National University, Seoul, 151-747 (Korea, Republic of)

Differential cross sections for {gamma}p{yields}K{sup +}{lambda}(1405) and {gamma}p{yields}K{sup +}{sigma}{sup 0}(1385) reactions have been measured in the photon energy range from 1.5 to 2.4 GeV and the angular range of 0.8<cos({theta})<1.0 for the K{sup +} scattering angle in the center-of-mass system. This data is the first measurement of the {lambda}(1405) photoproduction cross section. The line shapes of {lambda}(1405) measured in {sigma}{sup +}{pi}{sup -} and {sigma}{sup -}{pi}{sup +} decay modes were different with each other, indicating a strong interference of the isospin 0 and 1 terms of the {sigma}{pi} scattering amplitudes. The ratios of {lambda}(1405) production to {sigma}{sup 0}(1385) production were measured in two photon energy ranges: near the production threshold (1.5<E{sub {gamma}}<2.0 GeV) and far from it (2.0<E{sub {gamma}}<2.4 GeV). The observed ratio decreased in the higher photon energy region, which may suggest different production mechanisms and internal structures for these hyperon resonances.

• OSTI ID: 21192236
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 78, Issue 3; Other Information: DOI: 10.1103/PhysRevC.78.035202; (c) 2008 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
CENTER-OF-MASS SYSTEM
DECAY
DIFFERENTIAL CROSS SECTIONS
GEV RANGE 01-10
INTERFERENCE
ISOSPIN
KAONS
LAMBDA-1405 BARYONS
PHOTONS
PHOTOPRODUCTION
PIONS
PROTONS
RESONANCE
SCATTERING
SCATTERING AMPLITUDES
SHAPE
SIGMA PARTICLES