Possible SIGMA((1/2){sup -}) under the SIGMA(1385) peak in KSIGMA photoproduction

The LEPS Collaboration has recently reported a measurement of the gamman->K{sup +}SIGMA*{sup -}(1385) reaction using a linearly polarized photon beam around the resonance region. The observed beam asymmetry is sizably negative at E{sub g}amma=1.8-2.4 GeV, in contrast to the presented theoretical...

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Bibliographic Details
Published in:Physical review. C, Nuclear physics Nuclear physics, 2010-05, Vol.81 (5)
Main Authors: Gao Puze, Wu Jiajun, Zou, B. S., Theoretical Physics Center for Science Facilities, CAS, Beijing 100049
Format: Article
Language:English
Subjects:
ACCELERATORS
ASYMMETRY
BARYONS
BASIC INTERACTIONS
BEAMS
CYCLIC ACCELERATORS
ELECTROMAGNETIC INTERACTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
FORECASTING
FUNCTIONS
GEV RANGE
GEV RANGE 01-10
HADRONS
HYPERONS
INTERACTIONS
LAGRANGIAN FUNCTION
LEP STORAGE RINGS
MASS
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PHOTON BEAMS
PHOTOPRODUCTION
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
RESONANCE
SIGMA BARYONS
SIGMA MINUS PARTICLES
SIGMA PARTICLES
SIGMA-1385 BARYONS
STORAGE RINGS
STRANGE PARTICLES
SYNCHROTRONS
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Summary:The LEPS Collaboration has recently reported a measurement of the gamman->K{sup +}SIGMA*{sup -}(1385) reaction using a linearly polarized photon beam around the resonance region. The observed beam asymmetry is sizably negative at E{sub g}amma=1.8-2.4 GeV, in contrast to the presented theoretical prediction. In this paper, we calculate this process using the framework of the effective Lagrangian approach. By including a newly proposed SIGMA(J{sup P}=(1/2){sup -}) state with a mass around 1380 MeV, the experimental data for both gamman and gammap experiments can be well reproduced. It is found that the SIGMA((1/2){sup -}) and/or the contact term may play an important role and may deserve further investigation.
ISSN:0556-2813
1089-490X
DOI:10.1103/PHYSREVC.81.055203