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Exclusive production of pions and the pion distribution amplitude
(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 ...
Electromagnetic form factor of the pion in the space- and time-like regions within the front-form dynamics
(2004-02-12)
The pion electromagnetic form factor is calculated in the space- and time-like regions from -10 (GeV/c)2 up to 10 (GeV/c)2, within a front-form model. The dressed photon vertex where a photon decays in a quark-antiquark ...
On high Q(2) behavior of the pion form factor for transitions gamma*gamma -> pi(0) and gamma*gamma* -> pi(0) within the nonlocal quark-pion model
(Elsevier B.V., 2000-03-02)
The behavior of the transition pion form factor for processes gamma (*)gamma --> pi(0) and gamma (*)gamma (*) --> pi(0) at large values of space-like photon momenta is estimated within the nonlocal covariant quark-pion ...
On high Q(2) behavior of the pion form factor for transitions gamma*gamma -> pi(0) and gamma*gamma* -> pi(0) within the nonlocal quark-pion model
(Elsevier B.V., 2000-03-02)
The behavior of the transition pion form factor for processes gamma (*)gamma --> pi(0) and gamma (*)gamma (*) --> pi(0) at large values of space-like photon momenta is estimated within the nonlocal covariant quark-pion ...
Pion electromagnetic form factor and Fock state components
(2006-12-01)
The pion electromagnetic form factor in the space- and time-like regions are for the first time analyzed within a light-front model, that allows one to address the fundamental issue of non-valence components of the pion ...
Form factors of radiative pion decays in nonlocal chiral quark models
(American Physical Society, 2012-10)
We study the radiative pion decay π +→e +ν eγ within nonlocal chiral quark models that include wave function renormalization. In this framework we analyze the momentum dependence of the vector form factor F V(q2) and the ...
Interação nucleon-nucleon devida à troca de três píons e produção de um píon devida à troca de dois píons
(Universidade Estadual Paulista (Unesp), 2002-02)
Utilizando a simetria quiral, calculamos a contribuição dominante ao potencial nucleon-nucleon (NN) devido à troca de três píons não correlacionados. Esta contribuição é isovetorial com as componentes pseudoescalar e axial. ...
Interação nucleon-nucleon devida à troca de três píons e produção de um píon devida à troca de dois píons
(Universidade Estadual Paulista (Unesp), 2002-02)
Utilizando a simetria quiral, calculamos a contribuição dominante ao potencial nucleon-nucleon (NN) devido à troca de três píons não correlacionados. Esta contribuição é isovetorial com as componentes pseudoescalar e axial. ...