Pions and Excited Scalars in Minkowski Space DSBSE Formalism

0450507 - ÚJF 2016 RIV US eng J - Journal Article
Šauli, Vladimír
Pions and Excited Scalars in Minkowski Space DSBSE Formalism.
International Journal of Theoretical Physics. Roč. 54, č. 11 (2015), s. 4131-4141. ISSN 0020-7748. E-ISSN 1572-9575
Institutional support: RVO:61389005
Keywords : non-perturbative QCD * mesons * Bethe-Salpeter equation * confinement
Subject RIV: BE - Theoretical Physics
Impact factor: 1.041, year: 2015

We present the solution of Schwinger-Dyson and Bethe-Salpeter equation (BSE) for a light flawour non-singlet spinless meson in Minkowski space. The equations are solved in momentum space without the use of the auxiliary Euclidean space. To exhibit that Minkowski space non perturbative calculations are actually possible is the main purpose of presented paper. According to confinement, the quark propagator is regular in momentum space, which allows us to look for the BSE solution directly in the Minkowski momentum space. We find the Minkowski space solution for confining theories is not only numerically accessible, but also provides a reasonable description of the pseudoscalar meson system. However, in the case of scalar mesons, the model is less reliable and we get more extra light states then observed experimentally.
Permanent Link: http://hdl.handle.net/11104/0251808