Fagundes, D. A.Luna, E. G.S.Natale, A. A. [UNESP]Peláez, M.2020-12-122020-12-122020-01-01Journal of Physics G: Nuclear and Particle Physics, v. 47, n. 4, 2020.1361-64710954-3899http://hdl.handle.net/11449/200211Considering, as a limit case, an approximately flat pion distribution amplitude, which is determined from the hardest, in momentum space, solution of the Bethe-Salpeter equation for the pion wave function, we compute the pion transition form factor Fπγγ ∗ (Q2) and the pion form factor F π(Q 2), taking into account the LO as well as NLO form of the hard coefficient function entering the leading-twist factorization formula. We also compute the exclusive photoproduction of pions pairs at high energies, γγ →π+π-, where perturbative QCD can be used to compute the hard scattering matrix elements. We verify that the existent data for exclusive pion production can be reasonably described as a function of such a flat distribution amplitude.engnon-perturbative QCDpion distribution amplitudepion transition form factorArtigo10.1088/1361-6471/ab69472-s2.0-85082428334