Consistency between SU(3) and SU(2) covariant baryon chiral perturbation theory for the nucleon mass

Ren, Xiu-Lei ; Alvarez-Ruso, L. ; Geng, Li-Sheng ; Ledwig, Tim ; Meng, Jie ; Vacas, M. J. Vicente (2017)

CITATION: Ren, X. L., et al. 2017. Consistency between SU(3) and SU(2) covariant baryon chiral perturbation theory for the nucleon mass. Physics Letters B, 766:325-333, doi:10.1016/j.physletb.2017.01.024.

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Article

Treating the strange quark mass as a heavy scale compared to the light quark mass, we perform a matching of the nucleon mass in the SU(3) sector to the two-flavor case in covariant baryon chiral perturbation theory. The validity of the 19 low-energy constants appearing in the octet baryon masses up to next-to-next-to-next-to-leading order [1] is supported by comparing the effective parameters (the combinations of the 19 couplings) with the corresponding low-energy constants in the SU(2) sector [2]. In addition, it is shown that the dependence of the effective parameters and the pion-nucleon sigma term on the strange quark mass is relatively weak around its physical value, thus providing support to the assumption made in Ref. [2] that the SU(2) baryon chiral perturbation theory can be applied to study nf = 2+1 lattice QCD simulations as long as the strange quark mass is close to its physical value.

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