Exclusive production of pions and the pion distribution amplitude

Author(s)

Fagundes, D. A. ^[1] ; Luna, E. G. S. ^[2] ; Natale, A. A. ^[3] ; Pelaez, M. ^{[2, 4]}

Affiliation

^[1] Univ Fed Santa Catarina, Dept Ciencias Exatas & Educ, Campus Blumenau, BR-89065300 Blumenau, SC - Brazil

^[2] Univ Fed Rio Grande do Sul, Inst Fis, Caixa Postal 15051, BR-91501970 Porto Alegre, RS - Brazil

^[3] Univ Estadual Paulista UNESP, Inst Fis Teor, Rua Dr Bento T Ferraz 271, Bloco 2, BR-01140070 Sao Paulo - Brazil

^[4] Univ Republica, Fac Ingn, Inst Fis, JH & Reissig 565, Montevideo 11000 - Uruguay

• Document type: Journal article
• Source: JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS; v. 47, n. 4 FEB 2020.
• Web of Science Citations: 0

Abstract

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 F-pi gamma gamma{*}(Q(2)) and the pion form factor F-pi(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, gamma gamma -> pi(+)pi(-), 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. (AU)

• FAPESP's process: 13/22079-8 - Physics of particles and fields: standard model and its extensions
• Grantee: Adriano Antonio Natale
• Support Opportunities: Research Projects - Thematic Grants