Constituent and current quark masses at low chiral energiesM. D. Scadron1, 2, F. Kleefeld2 and G. Rupp2
1 Physics Department, University of Arizona - Tucson, AZ 85721, USA
2 Centro de Física das Interacções Fundamentais, Instituto Superior Técnico, Universidade Técnica de Lisboa P-1049-001 Lisboa, Portugal
received 10 July 2007; accepted in final form 11 October 2007; published December 2007
published online 6 November 2007
Light constituent quark masses and the corresponding dynamical quark masses are determined by data, the Quark-Level Linear Model, and infrared QCD. This allows to define effective nonstrange and strange current quark masses which reproduce the experimental pion and kaon masses very accurately, by simple additivity. Moreover, the masses of the light scalar mesons (600) and (800) can be obtained straightforwardly from the constituent quark masses. In contrast, the usual nonstrange and strange current quark masses employed by Chiral Perturbation Theory do not allow a simple quantitative explanation of the pion and kaon masses.
14.65.Bt - Light quarks.
14.40.Aq - , K, and mesons.
11.30.Rd - Chiral symmetries.
© Europhysics Letters Association 2007