Negative pion photoproduction from deuterium and a partial wave analysis of positive pion and negative pion photoproduction in the energy region 500 to 1250 MeV

• Main Author: Scheffler, Paul Erick
• Format: Others
• Published: 1972
• Online Access: https://thesis.library.caltech.edu/3691/1/Scheffler_pe_1972.pdf; Scheffler, Paul Erick (1972) Negative pion photoproduction from deuterium and a partial wave analysis of positive pion and negative pion photoproduction in the energy region 500 to 1250 MeV. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/T5Y8-PR50. https://resolver.caltech.edu/CaltechETD:etd-09222005-113106 <https://resolver.caltech.edu/CaltechETD:etd-09222005-113106>

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. Single [...] and [...] photoproduction rates from deuterium have been measured at the Caltech 1.5 GeV electron synchrotron at 32 photon energies between 585 and 1250 MeV and for 13 CM pion angles between 6 and 160° at each energy. The cross section for the reaction [...] has been calculated via the [...] ratio from deuterium and via the spectator model for the deuteron. A partial wave analysis has been done on the reactions [...] and [...] in the region of the second and third photoproduction resonances using the model of R. L. Walker. The results show some disagreements with recent quark theories. A case is made for the possibility that the [...] (1535) is excited by isoscalar photons, in agreement with some results of [...] photoproduction experiments, and in disagreement with quark theory. Finally, the helicity 3/2 component of the [...] (1688) resonance in [...] photoproduction is seen to be small, but not zero as predicted by the quark model.