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Two-pion production in photon-photon collisions
Affiliation:1. Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;2. Quark Matter Research Center, Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou, Gansu, 073000, China;1. Physik Department, Technische Universität München, D-85747 Garching, Germany;2. Institute for Advanced Simulation, Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany;3. Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, D-53115 Bonn, Germany;4. Bethe Center for Theoretical Physics, Universität Bonn, D-53115 Bonn, Germany;1. Instituto de Física e Matemática, Universidade Federal de Pelotas, Caixa Postal 354, CEP 96010-900, Pelotas, RS, Brazil;2. Instituto de Física, Universidade de São Paulo, CEP 05315-970 São Paulo, SP, Brazil
Abstract:We calculate within chiral perturbation theory the cross section for γγπ0π0 and γγπ+π to next-to-leading order. The first process only depends on the one-loop contributions and forms a test of chiral perturbation theory. We also calculate the pion electromagnetic form factor and compare it to recent data.
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