Light quark masses in multi-quark interactions
Centro de Fısica Computacional, Departamento de Fısica da Universidade de Coimbra, 3004-516, Coimbra, Portugal
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Accepted: 8 January 2013
Published online: 25 January 2013
We suggest and discuss in detail a multi-quark three-flavor Lagrangian of the Nambu-Jona-Lasinio type, which includes a set of effective interactions proportional to the current quark masses. It is shown that within the dynamical chiral symmetry-breaking regime, the masses of the pseudo-Goldstone bosons and their chiral partners, members of the low-lying scalar nonet, are in perfect agreement with current phenomenological expectations. The role of the new interactions is analyzed.
© SIF, Springer-Verlag Berlin Heidelberg, 2013