Lattice2010

Analysis of the Nf=2+1 lattice QCD results on the lowest-lying baryon masses using covariant ChPT

15 Jun 2010, 11:10

20m

Room6 (Villasimius, Sardinia)

Chiral symmetry Parallel 24: Chiral symmetry

Speaker

Jorge Martin Camalich (IFIC-Valencia)

Description

We present an analysis of the baryon-octet and -decuplet masses using covariant SU(3)-flavor chiral perturbation theory up to next-to-leading order. Besides the description of the physical masses we address the problem of the lattice QCD extrapolation. More precisely, we study the $N_f=2+1$ results recently provided by the PACS-CS, LHPC and HSC collaborations. We show that a good description of the lattice points can be achieved at next-to-leading order with the covariant loop amplitudes and phenomenologically determined values for the meson-baryon couplings. Furthermore, the extrapolations to the physical point of the results are found to be better than the linear ones given at leading-order by the Gell-Mann-Okubo approach. The importance that a reliable combination of lattice QCD and chiral perturbation theory may have for the determination of the LECs in the baryonic sector is emphasized with the prediction of the pion-baryon and strange-baryon sigma terms.

Presentation materials

Slides

camalic.pdf