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SUMMARY:On quark mass contributions: Baryon Octet Sigma Terms in the conti
nuum limit from $N_\\mathrm{f} = 2+1$ Lattice QCD with Wilson fermions
DTSTART:20231121T150000Z
DTEND:20231121T170000Z
DTSTAMP:20240305T153000Z
UID:indico-event-1347842@indico.cern.ch
DESCRIPTION:Speakers: Pia L. J. Petrak (Muenster)\n\nSigma terms are the q
uark mass contributions to the mass of a given baryon. We study the sigma
terms of the full baryon octet (nucleon\, lambda\, sigma\, xi) which has b
y far not been studied as much as the nucleon sigma term separately. This
allows us to investigate flavour symmetry breaking in the octet. Using sim
ilar methods as for the nucleon the sigma terms are determined on CLS gaug
e field ensembles employing the Lüscher-Weisz gluon action and the Sheikh
oleslami-Wohlert fermion action with $N_\\mathrm{f} = 2 + 1$. The ensemble
s analysed here have pion masses ranging from ${410}\\\,\\mathrm{MeV}$ dow
n to ${216}\\\,\\mathrm{MeV}$ and lattice spacings covering a range betwee
n${0.039}\\\,\\mathrm{fm}$ and ${0.098}\\\,\\mathrm{fm}$.To tackle the wel
l-known problem of excited state contamination we have studied the effect
of different multi-state fits on the sigma terms.In order to investigate t
he systematic error arising from the varied treatment of the excited state
s we carry out the full analysis for different choices of multi-state fits
. In the end\, the sigma terms of the baryon octet are simultaneously ex
trapolated to the physical point taking the quark mass dependence\, lattic
e spacing and finite volume effects into account.Notably SU(3) low energy
constants (LECs) from Baryon Chiral Perturbation Theory are also fitted th
at quantify flavour-symmetry breaking effects.\n\nhttps://indico.cern.ch/e
vent/1347842/\n\nLattice seminars: https://cern.zoom.us/j/68098777127?pwd=
U2FQNDFZNGVyWW5YOTViQncwUmJ3UT09
LOCATION:4/2-037 - TH meeting room (CERN)
URL:https://indico.cern.ch/event/1347842/
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