Speaker
Mr
Xiulei Ren
(School of Physics and Nuclear Energy Engineering, Beihang University)
Description
We have performed a comprehensive study of the lowest-lying octet baryon masses and sigma terms in the covariant baryon chiral perturbation theory (BChPT) with the extended-on-mass-shell (EOMS) renormalization scheme up to next-to-next-to-next-to-leading order (N3LO). We fix the relevant low-energy constants by a simultaneous fit of all the publicly available LQCD data. Finite volume and discretization effects on the LQCD simulations are taken into account self-consistently. Our main results are
(1)The N3LO EOMS BChPT can give a reasonable description of the LQCD data with a χ2/d.o.f. = 1.0 and the various lattice simulations seem to be consistent with each other.
(2) The predicted values of the pion- and strangeness-nucleon sigma terms are σπN = 43(1)(6) MeV and σsN = 126(24)(54) MeV, respectively.
(3) The virtual decuplet effects on the baryon masses cannot be distinguished from those of the virtual octet baryons and the tree level diagrams.
(4) The finite-volume corrections to the octet baryon masses are important and can be useful to help constrain some relevant low-energy constants.
(5) Up to O(a2), the discretization effects on the LQCD baryon masses are shown to be small and can be safely ignored.
Primary author
Mr
Xiulei Ren
(School of Physics and Nuclear Energy Engineering, Beihang University)
