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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:20231201T174307Z
UID:indico-event-1347842@indico.cern.ch
DESCRIPTION:Sigma terms are the quark 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 by far not been studied as much as the nuc
leon sigma term separately. This allows us to investigate flavour symmetry
breaking in the octet. Using similar methods as for the nucleon the sigma
terms 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 analysed here have pion masses ranging
from ${410}\\\,\\mathrm{MeV}$ down to ${216}\\\,\\mathrm{MeV}$ and lattice
spacings covering a range between${0.039}\\\,\\mathrm{fm}$ and ${0.098}\\
\,\\mathrm{fm}$.To tackle the well-known problem of excited state contamin
ation we have studied the effect of different multi-state fits on the sigm
a terms.In order to investigate the systematic error arising from the vari
ed treatment of the excited states we carry out the full analysis for diff
erent choices of multi-state fits. In the end\, the sigma terms of the bar
yon octet are simultaneously extrapolated to the physical point taking t
he quark mass dependence\, lattice spacing and finite volume effects into
account.Notably SU(3) low energy constants (LECs) from Baryon Chiral Pertu
rbation Theory are also fitted that quantify flavour-symmetry breaking eff
ects.\n\nhttps://indico.cern.ch/event/1347842/
LOCATION:CERN 4/2-037 - TH meeting room
URL:https://indico.cern.ch/event/1347842/
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