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

Abstract

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.

Authors:
; ;  [1];  [2];  [3]; ; ; ; ; ; ; ; ; ; ; ; ; ; ; more »;  [4] « less
  1. Florida International University, Miami, Florida 33199 (United States)
  2. Thomas Jefferson National Accelerator Laboratory, Newport News, Virginia 23606 (United States)
  3. (United States)
  4. Thomas Jefferson National Accelerator Laboratory, Newport News, Virginia 23606 (United States) (and others)
Publication Date:
OSTI Identifier:
20995228
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 4; Other Information: DOI: 10.1103/PhysRevC.75.045203; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Ambrozewicz, P., Gonenc, A., Moteabbed, M., Carman, D. S., Ohio University, Athens, Ohio 45701, 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., and Mecking, B. A. Separated structure functions for the exclusive electroproduction of K{sup +}{lambda} and K{sup +}{sigma}{sup 0} final states. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.045203.
Ambrozewicz, P., Gonenc, A., Moteabbed, M., Carman, D. S., Ohio University, Athens, Ohio 45701, 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. Separated structure functions for the exclusive electroproduction of K{sup +}{lambda} and K{sup +}{sigma}{sup 0} final states. United States. doi:10.1103/PHYSREVC.75.045203.
Ambrozewicz, P., Gonenc, A., Moteabbed, M., Carman, D. S., Ohio University, Athens, Ohio 45701, 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., and Mecking, B. A. Sun . "Separated structure functions for the exclusive electroproduction of K{sup +}{lambda} and K{sup +}{sigma}{sup 0} final states". United States. doi:10.1103/PHYSREVC.75.045203.
@article{osti_20995228,
title = {Separated structure functions for the exclusive electroproduction of K{sup +}{lambda} and K{sup +}{sigma}{sup 0} final states},
author = {Ambrozewicz, P. and Gonenc, A. and Moteabbed, M. and Carman, D. S. and Ohio University, Athens, Ohio 45701 and Feuerbach, R. J. and Mestayer, M. D. and Avakian, H. and Boiarinov, S. and Brooks, W. K. and Burkert, V. D. and Cords, D. and Degtyarenko, P. V. and Deur, A. and Elouadrhiri, L. and Guo, L. and Gyurjyan, V. and Ito, M. M. and Lawrence, D. and Manak, J. J. and Mecking, B. A.},
abstractNote = {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.},
doi = {10.1103/PHYSREVC.75.045203},
journal = {Physical Review. C, Nuclear Physics},
number = 4,
volume = 75,
place = {United States},
year = {Sun Apr 15 00:00:00 EDT 2007},
month = {Sun Apr 15 00:00:00 EDT 2007}
}