ρProduction from Hydrogen by 16-GeV Bremsstrahlung

Abstract

A 2.2-m streamer chamber in a large electromagnet was used with a 16-GeV bremsstrahlung beam to study multibody photoproduction. This paper reports on the 851 three-prong, three-constraint kinematic fit events of the type $\gamma p\to {\pi }^{+}{\pi }^{-}p$; at energies above 6 GeV, these go almost completely to a $p{\rho }^0$ final state.