NONCOPLANARITY EFFECTS IN PROTON-PROTON BREMSSTRAHLUNG

Noncoplanarity in proton-proton bremsstrahlung is investigated. Signif icant effects are observed for certain photon polar angles, psi(gamma) . Such noncoplanarity effects, not of dynamical origin, are possibly r esponsible for past disagreements between theory and experiment. The H arvard noncoplanar coordinate system, which avoids kinematic singulari ties in the cross section, is used in our calculations and is recommen ded for use in the analysis of experimental data. Alternative methods of presenting cross sections are discussed. [S0556-2813(98)50110-0].