Physics – Nuclear Physics – Nuclear Theory
Scientific paper
1996-04-09
Phys.Lett. B382 (1996) 19-23
Physics
Nuclear Physics
Nuclear Theory
8 pp, LaTeX
Scientific paper
10.1016/0370-2693(96)00646-6
We consider the chiral expansion of the threshold amplitude for the reaction
$\gamma p \to \pi^0 \pi^0 p$ to order ${\cal O}(M_\pi^2)$. We substantiate a
claim that this photoproduction channel is significantly enhanced close to
threshold due to pion loops. A precise measurement of the corresponding cross
sections is called for which allows to test chiral perturbation theory.
Bernard Véronique
Kaiser Nicholas
Meißner Ulf-G.
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