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dc.contributor.authorDrach, V
dc.contributor.authorAlexandrou, C
dc.contributor.authorConstantinou, M
dc.contributor.authorDinter, S
dc.contributor.authorHadjiyiannakou, K
dc.contributor.authorJansen, K
dc.contributor.authorKoutsou, G
dc.contributor.authorVaquero, A
dc.contributor.authorStrelchenko, A
dc.description7 pages, 6 figures. Talk given at the XXX International Symposium on Lattice Field Theory - Lattice 2012, June 24-29, 2012 Cairns, Australia

We investigate excited state contaminations in a direct computation of the nucleon s-terms. This is an important source of systematic effects that needs to be controlled besides the light quark mass dependence and lattice artefacts. We use maximally twisted mass fermions with dynamical light (u,d), strange and charm degrees of freedom. Employing an efficient stochastic evaluation of the disconnected contribution available for twisted mass fermions, we show that the effect of excited states is large in particular for the strange s-terms, where it can be as big as O(and 40%). This leads to the unfortunate conclusion that even with a source-sink separation of -1.5 fm and a good statistical accuracy it is not clear, whether excited state effects are under control for this quantity.

dc.publisherSissa Medialab
dc.titleSigma terms and strangeness content of the nucleon with Nf=2+1+1 twisted mass fermions
dc.typeConference Proceeding
plymouth.volumePart F130497
plymouth.conference-nameThe 30th International Symposium on Lattice Field Theory
plymouth.journalProceedings of The 30th International Symposium on Lattice Field Theory — PoS(Lattice 2012)
plymouth.organisational-group/Plymouth/Faculty of Science and Engineering
plymouth.organisational-group/Plymouth/REF 2021 Researchers by UoA
plymouth.organisational-group/Plymouth/REF 2021 Researchers by UoA/EXTENDED UoA 10 - Mathematical Sciences
plymouth.organisational-group/Plymouth/REF 2021 Researchers by UoA/UoA10 Mathematical Sciences
plymouth.organisational-group/Plymouth/Users by role
plymouth.organisational-group/Plymouth/Users by role/Academics
dc.rights.embargoperiodNot known
rioxxterms.typeConference Paper/Proceeding/Abstract

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