Abstract

High-statistics differential cross sections and spin-density matrix elements for the reaction ?p?p? have been measured using the CEBAF large acceptance spectrometer (CLAS) at Jefferson Lab for center-of-mass (c.m.) energies from threshold up to 2.84 GeV. Results are reported in 112 10-MeV wide c.m. energy bins, each subdivided into cos?c.m.? bins of width 0.1. These are the most precise and extensive ? photoproduction measurements to date. A number of prominent structures are clearly present in the data. Many of these have not previously been observed due to limited statistics in earlier measurements. © 2009 The American Physical Society.