We report measurements of the exclusive electroproduction of K+Lambda and K+Sigma(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(T),sigma(L),sigma(TT), and sigma(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(L)/sigma(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(2) <= 2.8 GeV2 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(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.

SEPARATED STRUCTURE FUNCTIONS FOR THE EXCLUSIVE ELECTROPRODUCTION OF K+ LAMBDA AND K+ SIGMA0 FINAL STATES

CORVISIERO, PIETRO;RICCO, GIOVANNI;TAIUTI, MAURO GINO;
2007-01-01

Abstract

We report measurements of the exclusive electroproduction of K+Lambda and K+Sigma(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(T),sigma(L),sigma(TT), and sigma(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(L)/sigma(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(2) <= 2.8 GeV2 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(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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/227875
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