Generalized bremsstrahlung model for high-energy collisions and the production of charged pions

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Abstract
By means of the PDECC (partial differential equations with respect to coupling constants) formalism, we formulate the generalized bremsstrahlung model for high-energy collisions. This model, unlike the ordinary bremsstrahlung model, allows the secondary particles to be emitted with correlations in high-energy collisions of two primary particles. This freedom of having correlations among emitted secondaries allows us to formulate a specific bremsstrahlung model with charge conservation for charged-pion production. Comparison of this theory with experiment shows good agreement. We argue that it may not be possible to derive this specific bremsstrahlung model via the Lagrangian formalism.