Phys. Rev. C 61, 025203 (2000) [7 pages]A quark model calculation of γγ⃗ππ including final-state interactionsReceived 1 September 1999; published 19 January 2000 A quark model calculation of the processes γγ⃗π+π- and γγ⃗π0π0 is performed. At tree level, only charged pions couple to the initial state photons and neutral pions are not expected in the final state. However, a small but significant γγ⃗π0π0 cross section is observed. We demonstrate that this may be accounted for by a rotation in isospin space induced by final-state interactions. The resulting π+π- cross section is in good agreement with experiment, while the π0π0 cross section is in qualitative agreement with the data. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.61.025203
DOI:
10.1103/PhysRevC.61.025203
PACS:
21.30.Fe, 13.75.Lb, 12.39.Pn, 24.85.+p
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