Abstract
A large part of the experimental program in Hall B of the Jefferson Lab is dedicated to light baryon spectroscopy. Meson photoprodcution experiments are essential part of this program. CEBAF Large Acceptance Spectrometer (CLAS) and availability of circularly and linearly polarized tagged photon beams and frozen spin polarized targets provide unique conditions for this type of experiments. This combination of experimental tools gives a remarkable opportunity to measure double polarization observables for different pseudo-scalar meson photoproduction processes. For the first time, a complete or nearly complete measurement became possible and will facilitate model independent extraction of the reaction amplitude. An overview of the experimental program and its current status together with recent results on double polarization measurements in π+ photoproduction are presented.
Highlights
A large part of the experimental program in Hall B of the Jefferson Lab is dedicated to light baryon spectroscopy
Among the most exciting and challenging topics in sub-nuclear physics today is the study of the structure of the nucleon and its different modes of excitation, the baryon resonances
While the significant amount of the meson photoproduction cross section measurements became available in recent years, these data alone cannot give an unambiguous answer about resonances
Summary
Among the most exciting and challenging topics in sub-nuclear physics today is the study of the structure of the nucleon and its different modes of excitation, the baryon resonances. In spite of extensive studies spanning decades, many of the baryon resonances are still not well established and their parameters (i.e., mass, width, and couplings to various decay modes) are poorly known Much of this is due to the complexity of the nucleon resonance spectrum, with many broad, overlapping resonances. In order to be able to extract the amplitude of the process without any assumption one needs to measure at least eight carefully chosen single and double polarization observables. Experimental Hall-B will be presented followed by a few examples of recent double polarization experiments in pion photoproduction and overall status of the program
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