Separated structure functions for the exclusive electroproduction of K{sup +}{lambda} and K{sup +}{sigma}{sup 0} final states

Journal Article · Sun Apr 15 00:00:00 EDT 2007 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.75.045203· OSTI ID:20995228

Ambrozewicz, P; Gonenc, A; Moteabbed, M ^[1]; Carman, D S ^[2]; Feuerbach, R J; Mestayer, M D; Avakian, H; Boiarinov, S; Brooks, W K; Burkert, V D; Cords, D; Degtyarenko, P V; Deur, A; Elouadrhiri, L; Guo, L; Gyurjyan, V; Ito, M M; Lawrence, D; Manak, J J; Mecking, B A ^[2]

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1. Florida International University, Miami, Florida 33199 (United States)
2. Thomas Jefferson National Accelerator Laboratory, Newport News, Virginia 23606 (United States)

We report measurements of the exclusive electroproduction of K{sup +}{lambda} and K{sup +}{sigma}{sup 0} final states from a proton target using the Continuous Electron Beam Accelerator Facility (CEBAF) large-acceptance spectrometer (CLAS) detector at the Thomas Jefferson National Accelerator Facility. The separated structure functions {sigma}{sub T},{sigma}{sub L},{sigma}{sub TT}, and {sigma}{sub LT} were extracted from the {phi}- and {epsilon}-dependent differential cross sections taken with electron beam energies of 2.567, 4.056, and 4.247 GeV. This analysis represents the first {sigma}{sub L}/{sigma}{sub T} separation with the CLAS detector, and the first measurement of the kaon electroproduction structure functions away from parallel kinematics. The data span a broad range of momentum transfers from 0.5{<=}Q{sup 2}{<=}2.8GeV{sup 2} and invariant energy from 1.6{<=}W{<=}2.4 GeV, while spanning nearly the full center-of-mass angular range of the kaon. The separated structure functions reveal clear differences between the production dynamics for the {lambda} and {sigma}{sup 0} hyperons. These results provide an unprecedented data sample with which to constrain current and future models for the associated production of strangeness, which will allow for a better understanding of the underlying resonant and nonresonant contributions to hyperon production.

• OSTI ID: 20995228
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 75, Issue 4; Other Information: DOI: 10.1103/PhysRevC.75.045203; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATOR FACILITIES
CEBAF ACCELERATOR
CENTER-OF-MASS SYSTEM
DIFFERENTIAL CROSS SECTIONS
ELECTRON BEAMS
ELECTRON-PROTON INTERACTIONS
ELECTROPRODUCTION
GEV RANGE
KAONS
MOMENTUM TRANSFER
POTASSIUM IONS
PROTONS
SIGMA NEUTRAL PARTICLES
SPECTROMETERS
STRANGENESS
STRUCTURE FUNCTIONS