A quark model calculation of {gamma}{gamma}{yields}{pi}{pi} including final-state interactions
- Ottawa-Carleton Institute for Physics, Department of Physics, Carleton University, Ottawa, Canada K1S 5B6 (Canada)
- Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 and Jefferson Laboratory, 12000 Jefferson Avenue, Newport News, Virginia 23606 (United States)
A quark model calculation of the processes {gamma}{gamma}{yields}{pi}{sup +}{pi}{sup -} and {gamma}{gamma}{yields}{pi}{sup 0}{pi}{sup 0} 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 {gamma}{gamma}{yields}{pi}{sup 0}{pi}{sup 0} 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 {pi}{sup +}{pi}{sup -} cross section is in good agreement with experiment, while the {pi}{sup 0}{pi}{sup 0} cross section is in qualitative agreement with the data. (c) 2000 The American Physical Society.
- OSTI ID:
- 20215388
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 61, Issue 2; Other Information: PBD: Feb 2000; ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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