Exclusive production of pions and the pion distribution amplitude
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Data
2020-01-01
Autores
Fagundes, D. A.
Luna, E. G.S.
Natale, A. A. [UNESP]
Peláez, M.
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Resumo
Considering, 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.
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non-perturbative QCD, pion distribution amplitude, pion transition form factor
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Journal of Physics G: Nuclear and Particle Physics, v. 47, n. 4, 2020.