χPT Calculations with two-pion Loops for S-wave π0 Production in pp Collision
E. Gedalin, A. Moalem, L. Razdolskaya
Abstract
The total cross section for the pp pp π0 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 π0 production at threshold. The calculated cross section reproduces data, both scale and energy dependence, fairly well.
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