Köln 2004 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 5: Theory I

HK 5.11: Vortrag

Montag, 8. März 2004, 18:30–18:45, D

Analysis of baryon masses to second order in the quark masses — •Matthias Frink and Ulf-G. Meißner — IKP, FZ Jülich, Jülich, Germany and HISKP (Th), Universität Bonn, Bonn, Germany

We analyse the masses of the ground state baryon octet to second order in the quark masses in the framework of a lorentz-invariant formulation of baryon chiral perturbation theory. We also include strong isospin breaking, thus extending earlier work [1]. We present compact formulae that can be used for the chiral extrapolation of lattice simulations, that usually work at higher quark (meson) masses [2]. As a by-product, we also construct the complete fourth order meson-baryon Lagrangian for three flavors with all possibel external sources.

[1] B. Borasoy and U.-G. Meißner, Ann. Phys. 254 (1997 )192-232

[2] M. Frink and U.-G. Meißner, in preparation