$χ$PT Calculations with two-pion Loops for S-wave $π^0$ Production in pp Collision

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The total cross section for the $pp \to pp \pi^0$ reaction at energies close to threshold is calculated within the frame of a chiral perturbation theory, taking into account tree and one loop diagrams up to chiral order D=2. Two-pion loop contributions dominate $\pi^0$ production at threshold. The calculated cross section reproduces data, both scal

Author: E. Gedalin; A. Moalem; L. Razdolskaya

Source: https://archive.org/