Scale Setting in Nf=2+1 QCD with Wilson fermions (6/12)

by Dr Sara Collins (University of Regensburg)

Monday 4 Dec 2023, 13:15 → 14:15 Europe/Berlin

1.207 (IRIS)

Lattice predictions of key quantities needed in precision tests of the Standard Model aim at sub-percent accuracy. This requires similarly precise determinations of the lattice scale. The spectrum of the octet baryons, that do not undergo strong decay, provide clean experimental input for this purpose. Lattice results are generated at finite lattice spacing and often not exactly at the physical point, so that a combined continuum and chiral extrapolation is required. In view of this, it is useful to introduce an intermediate scale parameter, such as the Wilson flow scale $t_0$, to relate between different lattice spacings, that can be determined very precisely and shows little dependence on the quark masses. We determine $t_0$ using the $\Xi$ baryon mass as input on a large set of Coordinated Lattice Simulations ensembles comprised of six lattice spacings. One novelty of our simulations is the excellent coverage of the plane spanned by the light and strange quark masses. The light octet and decuplet baryon spectrum is determined along with the corresponding pion-baryon sigma terms.

talk.pdf