Autor(es): Fagundes, D. A. ; Luna, E. G.S. ; Natale, A. A. [UNESP] ; Peláez, M.
Data: 2020
Identificador Persistente: http://hdl.handle.net/11449/200211
Origem: Oasisbr
Assunto(s): non-perturbative QCD; pion distribution amplitude; pion transition form factor; non-perturbative QCD; non-perturbative QCD; pion distribution amplitude; pion distribution amplitude; pion transition form factor; pion transition form factor
Made available in DSpace on 2020-12-12T02:00:34Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-01-01
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.
Departamento de Ciencias Exatas e Educacao Universidade Federal de Santa Catarina - Campus Blumenau
Instituto de Física Universidade Federal Do Rio Grande Do sul, Caixa Postal 15051, 91501-970, RS
Instituto de Física Facultad de Ingeniería Universidad de la República, J. H. y Reissig 565
Instituto de Física Teórica Universidade Estadual Paulista (UNESP), Rua Dr. Bento T. Ferraz, Bloco II, 271
Instituto de Física Teórica Universidade Estadual Paulista (UNESP), Rua Dr. Bento T. Ferraz, Bloco II, 271
