820 research outputs found
A Mixed Action Analysis of and Mesons
We study and mesons and their mixing angle in a mixed action
approach with so-called Osterwalder-Seiler valence quarks on a Wilson twisted
mass sea. The gauge configurations have been generated by ETMC for
dynamical quark flavours and for three values of the lattice spacing. The main
results are that differences in between the mixed action and the unitary
approach vanish towards the continuum limit with the expected rate of
. The individual size of the lattice artifacts depends,
however, strongly on the observable used to match unitary and valence actions.
Moreover, we show that for the mass valence and valence plus sea quark
mass dependence differ significantly. Hence, in this case a re-tuning of the
simulation parameters in the valence sector only is not sufficient to
compensate for mismatches in the original quark masses.Comment: 30 pages, 8 figures, version accepted for publicatio
Barents Sea Shrimp - stock assessment report 2022/23
Since the 1980s, the Barents Sea has gone from a situation with high fishing pressure, cold conditions and low demersal fish stock levels, to the current situation with high levels of demersal fish stocks, reduced fishing pressure and warm conditions.Barents Sea Shrimp - stock assessment report 2022/23publishedVersio
Comparison of different lattice definitions of the topological charge
We present a comparison of different definitions of the topological charge on
the lattice, using a small-volume ensemble with 2 flavours of dynamical twisted
mass fermions. The investigated definitions are: index of the overlap Dirac
operator, spectral projectors, spectral flow of the Hermitian Wilson-Dirac
operator and field theoretic with different kinds of smoothing of gauge fields
(HYP and APE smearings, gradient flow, cooling). We also show some results on
the topological susceptibility.Comment: 7 pages, 2 figures, presented at the 32nd International Symposium on
Lattice Field Theory (Lattice 2014), 23-28 June 2014, Columbia University,
New York, NY, US
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