Aug 8 – 13, 2022
Hörsaalzentrum Poppelsdorf
Europe/Berlin timezone

Sigma terms of the baryon octet in $N_\mathrm{f} = 2+1$ QCD with Wilson quarks

Aug 9, 2022, 6:10 PM
20m
CP1-HSZ/1st-1.002 - HS6 (CP1-HSZ)

CP1-HSZ/1st-1.002 - HS6

CP1-HSZ

50
Oral Presentation Hadron Structure Hadron Structure

Speaker

Pia Leonie Jones Petrak (University of Münster)

Description

A lot of progress has been made in the direct determination of nucleon sigma terms. Using similar methods we consider the sigma terms of the other octet baryons as well. These are determined on CLS gauge field ensembles employing the Lüscher-Weisz gluon action and the Sheikholeslami-Wohlert fermion action with $N_\mathrm{f} = 2 + 1$. The ensembles have pion masses ranging from ${410}\,\mathrm{MeV}$ down to the physical value and lattice spacings covering a range between ${0.039}\,\mathrm{fm}$ and ${0.098}\,\mathrm{fm}$. We present a preliminary chiral extrapolation for $a\approx 0.06$ fm along a trajectory where the sum of the sea quark masses is kept constant. We discuss multi-state fits to tackle the well-known problem of excited state contamination comparing ratio and summation method.

Primary author

Pia Leonie Jones Petrak (University of Münster)

Co-authors

Gunnar Bali Sara Collins (University of Regensburg) Jochen Heitger (University of Münster, ITP) Daniel Jenkins (University of Regensburg) Mr Simon Weishäupl (University of Regensburg)

Presentation materials