منابع مشابه
News on Disconnected Diagrams *
We present evidence for disconnected contributions to the σπN term and the flavor singlet axial coupling g 0 A of the proton on full QCD configurations, which are obtained by means of improved stochastic estimator techniques. Furthermore we discuss results from the fermionic determination of the topological charge of the QCD vacuum (in the spirit of the Athiya-Singer theorem) again achieved wit...
متن کاملImproving Stochastic Estimator Techniques for Disconnected Diagrams ∗
Disconnected diagrams are expected to be sensitive to the inclusion of dynamical fermions. We present a feasibility study for the observation of such effects on the nucleonic matrix elements of the axial vector current, using SESAM full QCD vacuum configurations with Wilson fermions on 16 × 32 lattices, at β = 5.6. Starting from the standard methods developed by the Kentucky and Tsukuba groups,...
متن کاملNeutral mesons and disconnected diagrams in Twisted Mass QCD
We evaluate properties of neutral mesons in N f = 2 dynamical simulations of TMQCD at maximal twist. The pion is explored establishing the size of the isospin splitting (an order a2 effect). We investigate the η ′ (the N f = 2 flavour singlet pseudoscalar meson) and neutral ρ and scalar mesons. We show that disconnected diagrams can be evaluated very efficiently in TMQCD using variance reductio...
متن کاملOn calculating disconnected-type hadronic light-by-light scattering diagrams from lattice QCD
For reliable comparison of the standard model prediction to the muon g−2 with its experimental value, the hadronic light-by-light scattering (HLbL) contribution must be calculated by lattice QCD simulation. HLbL contribution has many types of disconnected-type diagrams. Here, we start with recalling the point that must be taken care of in every method to calculate them by lattice QCD, and prese...
متن کاملAnalysis on disconnected sets
Very often in analysis, one focuses on connected spaces. This is certainly not always the case, and in particular there are many interesting matters related to Cantor sets. Here we are more concerned with a type of complementary situation. As a basic scenario, suppose that U is an open set in Rn and that E is a closed set contained in the boundary of U such that for every x ∈ U and r > 0 there ...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 1999
ISSN: 0920-5632
DOI: 10.1016/s0920-5632(99)85224-4