A next-to-next-to-leading order pp -> ppπ^0 transition operator in chiral perturbation theory

Details A next-to-next-to-leading order pp -> ppπ^0 transition operator in chiral perturbation theory A next-to-next-to-leading order pp -> ppπ^0 transition operator in chiral perturbation theory

1999-08-05

arxiv.org/abs/nucl-th/9908023v2

Nucl.Phys.A663:465-468,2000

Physics

Nuclear Physics

Nuclear Theory

4 pages, 2 figures, talk delivered at PANIC99, correction of column VII in Table 1 and corresponding change of one sentence in

Scientific paper

10.1016/S0375-9474(99)00632-6

We discuss the results of a systematic calculation of the next-to-next-to-leading order amplitude for the pp -> pp\pi^0 S-wave production at the threshold in heavy-baryon chiral perturbation theory. We find six new diagrams, two of which can be viewed as vertex corrections, of 15 - 20 %, to the pion-exchange graph, whereas the rest are much larger, one exceeding 900 %. We discuss the reasons for this enhancement, as well as the steps necessary to be taken before the final comparison with experiment.

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