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NQMA-THEORY-16 GSI SCIENTIFIC REPORT 2008 Pion-cloud effects in light mesons ∗

By Christian S. Fischer and Richard Williams

Abstract

In hard scattering events mesons and baryons can be viewed as bound states built up from partonic constituents, i.e. quarks and gluons. This picture changes at low energies, where hadronic effects play a more prominent rôle in the nonperturbative structure of hadrons. Of particular importance are pion cloud effects which e.g. have a direct impact on the spin structure of the proton [1]. Thus they need to be incorporated in bound state calculations aiming at a realistic description of mesons and baryons. The natural framework for this composite description of mesons in the continuum are the Schwinger-Dyson and Bethe-Salpeter equations (SDEs and BSEs). Such studies have been extensively performed in the Rainbow-Ladder approximation [2]. Although this approximation led to some phenomenological success, it generically misses ou

Year: 2010
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