Electroproduction of the {Lambda}(1520) hyperon

Journal Article · Mon Oct 01 04:00:00 EDT 2001 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.64.044601· OSTI ID:40277180

Barrow, S P; Dennis, L; McAleer, S B; Adams, G; Amaryan, M J; Anciant, E; Anghinolfi, M; Asavapibhop, B; Asryan, G; Audit, G ^[1]

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1. and others

The reaction ep{yields}e'K{sup +}{Lambda}(1520) with {Lambda}(1520){yields}p'K{sup -} was studied at electron beam energies of 4.05, 4.25, and 4.46 GeV, using the CLAS detector at the Thomas Jefferson National Accelerator Facility. The cos {theta}{sub K{sup +}}, {phi}{sub K{sup +}}, Q{sup 2}, and W dependencies of {Lambda}(1520) electroproduction are presented for the kinematic region 0.9<Q{sup 2}<2.4 GeV{sup 2} and 1.95<W<2.65 GeV. Also, the Q{sup 2} dependence of the {Lambda}(1520) decay angular distribution is presented for the first time. The cos {theta}{sub K{sup +}} angular distributions suggest t-channel diagrams dominate the production process. Fits to the {Lambda}(1520) t-channel helicity frame decay angular distributions indicate the m{sub z}={+-}1/2 parentage accounts for about 60% of the total yield, which suggests this reaction has a significant contribution from t-channel processes with either K{sup +} exchange or longitudinal coupling to an exchanged K{sup *}. The Q{sup 2} dependence of the {Lambda}(1520) production cross section is the same as that observed for {Lambda}(1116) photo- and electroproduction.

• Research Organization: Thomas Jefferson National Accelerator Facility
• Sponsoring Organization: (US)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 40277180
• Journal Information: Physical Review C, Journal Name: Physical Review C Journal Issue: 4 Vol. 64; ISSN 0556-2813
• Publisher: The American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
ANGULAR DISTRIBUTION
CEBAF ACCELERATOR
CROSS SECTIONS
DECAY
ELECTRON BEAMS
ELECTROPRODUCTION
HELICITY
HYPERONS
PRODUCTION
T CHANNEL