Photoproduction of ETA Mesons from Hydrogen at Photon Energies Between 0.8 and 1.45 GeV

Citation

Rochester, Leon S. (1968) Photoproduction of ETA Mesons from Hydrogen at Photon Energies Between 0.8 and 1.45 GeV. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/0W0Y-7B43. https://resolver.caltech.edu/CaltechTHESIS:01112016-113552095

Abstract

We measured the differential cross section of the process γp → pƞ at the 1.5 GeV Caltech electron synchrotron, at photon energies from 0.8 to 1.45 GeV, at various angles between 45° and 100° in the center of mass. A counter-spark chamber array was used to determine the kinematics of all particles in the final state of the partial mode γp → pƞ (ƞ → 2γ). Analysis of 40,000 pictures yielded 6,000 events above a background which varied with energy from 5% to 30% of foreground. The cross section shows an energy dependence confirming earlier results up to 1000 MeV, but with improved statistics; it then remains roughly constant (at 50° C.M.), to 1.45 GeV. The data show a small angular variation, within the limited range covered, at energies between 1000 and 1100 MeV.

Thesis Files