Author/Authors :
L. Teodorescu، نويسنده , , P. Guèye، نويسنده , , T. Angelescu، نويسنده , , O.K. Baker، نويسنده , , R. Ent، نويسنده , , M. Guidal، نويسنده , , J.M. Laget، نويسنده , , J. Mitchell، نويسنده , , G. Niculescu، نويسنده , , M. Vanderhaeghen، نويسنده , , R. Williams، نويسنده ,
Abstract :
The result of a feasibility study to measure the Λ polarization in associated K+–Λ electro-production is presented. This measurement was performed in the experimental Hall C at Jefferson Lab. The scattered electron was detected in the HMS spectrometer, and the electro-produced kaon and the proton from the Λ→pπ− decay were both detected in the SOS spectrometer. This quantity is very sensitive to the elementary p(e,e′K)Λ process and gives information on resonance production, and Regge exchange, among others. The result presented was measured at Q2=1.50 (GeV/c)2 and cosθKγCM=14°. The limits of the Λ polarization, with respect to the View the MathML source axis, were found to be −0.21 and +0.89 with a confidence level of 68%. The result is compared to theoretical predictions based on an effective hadronic field Lagrangian model and a Regge framework model.
