Conference paper
The search for missing baryons with a beam of linearly-polarized photons
Philip L. Cole
; University of Texas at El Paso, El Paso, TX 79968, USA
Abstract
The photoproduction of ω and ρ mesons from protons with a beam of linearlypolarized photons will be used to decouple baryon resonance production from texchange processes in the center-of-mass energy regime of 1.72 to 2.24 GeV at Hall B of Jefferson Lab. Both the ωN and ρN channels are expected to be a significant branch for baryon resonances. t-channel exchange contributions can only be disentangled by the use of a linearly-polarized photon beam. The measurement will employ a linearly-polarized beam of photons, produced by the approved Coherent Bremsstrahlung Facility, to measure the beam asymmetry as well as the spin density matrix elements of the decay spin-0 mesons of the parent vector meson. The spin density matrix elements and polarization asymmetry of the vector meson decay will be extracted as functions of the vector meson production angle θcm and the center-of-mass energy √ s in the center-of-mass frame. These measurements will expedite the search for baryon resonance contributions, and furthermore, will yield new physics information on diffractive, t- and u-channel processes. Our approved experiments will increase the world’s data set by three orders of magnitude.
Keywords
baryon resonances; photoproduction; ω and ρ mesons; linearly-polarized photons; t- and u-channel processe
Hrčak ID:
305292
URI
Publication date:
1.3.1999.
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