Pion structure function within the instanton model
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
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Data(s) |
27/05/2014
27/05/2014
01/12/2000
|
Resumo |
The leading-twist valence-quark distribution function in the pion is obtained at a low normalization scale of an order of the inverse average size of an instanton pc. The momentum dependent quark mass and the quark-pion vertex are constructed in the framework of the instanton liquid model, using a gauge invariant approach. The parameters of instanton vacuum, the effective instanton radius and quark mass, are related to the vacuum expectation values of the lowest dimension quark-gluon operators and to the pion low energy observables. An analytic expression for the quark distribution function in the pion for a general vertex function is derived. The results are QCD evolved to higher momentum-transfer values, and reasonable agreement with phenomenological analyses of the data on parton distributions for the pion is found. ©2000 The American Physical Society. |
Identificador |
http://dx.doi.org/10.1103/PhysRevD.62.014016 Physical Review D, v. 62, n. 1, 2000. 0556-2821 http://hdl.handle.net/11449/66333 10.1103/PhysRevD.62.014016 WOS:000087954100034 2-s2.0-11144350401 2-s2.0-11144350401.pdf |
Idioma(s) |
eng |
Relação |
Physical Review D |
Direitos |
openAccess |
Tipo |
info:eu-repo/semantics/article |