Sigma term and strangeness content of the nucleon

S. Durr (1, 2) , Z. Fodor (1, 3, 2) , J. Frison (4, 5) , T. Hemmert (6) , C. Hoelbling (1) , S. D. Katz (3) , S. Krieg (1, 2) , T. Kurth (1) , Laurent Lellouch (5, 4) , T. Lippert (1, 2) , A. Portelli (5, 4) , A. Ramos (5, 4) , A. Schafer (6) , K. K. Szabo (1)

1 Theoretische Teilchenphysik
2 JSC - Jülich Supercomputing Centre
3 Departement for Theoretical Physics
4 CPT - E1 Physique des particules
5 CPT - Centre de Physique Théorique - UMR 7332
6 Institut fur Theoretische Physik, D-93040, Universitat Regensburg - Germany

A status report is given for a joint project of the Budapest-Marseille-Wuppertal collaboration and the Regensburg group to study the quark mass-dependence of octet baryons in SU(3) Baryon XPT. This formulation is expected to extend to larger masses than Heavy-Baryon XPT. Its applicability is tested with 2+1 flavor data which cover three lattice spacings and pion masses down to about 190 MeV, in large volumes. Also polynomial and rational interpolations in M_\pi^2 and M_K^2 are used to assess the uncertainty due to the ansatz. Both frameworks are combined to explore the precision to be expected in a controlled determination of the nucleon sigma term and strangeness content.

Domaines: Physique des Hautes Energies - Réseau [hep-lat]; Physique Nucléaire Théorique [nucl-th]

S. Durr, Z. Fodor, J. Frison, T. Hemmert, C. Hoelbling, et al.. Sigma term and strangeness content of the nucleon. 28th International Symposium on Lattice Field Theory (Lattice 2010), Jun 2010, Villasimius, Italy. pp.102. ⟨hal-01258108⟩