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Disconnected quark loop contributions to nucleon observables in lattice QCD

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arxiv 1310.6339 v2 pith:QHTRQBMC submitted 2013-10-23 hep-lat hep-phnucl-th

A. Abdel-Rehim (The Cyprus Inst.) , C. Alexandrou (Univ. of Cyprus & The Cyprus Inst.) , M. Constantinou (Univ. of Cyprus) , V. Drach (DESY-Zeuthen) , K. Hadjiyiannakou (Univ. of Cyprus) , K. Jansen (DESY-Zeuthen) , G. Koutsou (The Cyprus Inst.) , A. Vaquero (The Cyprus Inst.) This is my paper · ORCID
classification hep-lathep-phnucl-th
keywords disconnectednucleoncontributionslatticeobservablesaxialcalculationcompare
verification ladder T0 review T1 audit T2 compute T3 formal

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We perform a high statistics calculation of disconnected fermion loops on Graphics Processing Units for a range of nucleon matrix elements extracted using lattice QCD. The isoscalar electromagnetic and axial vector form factors, the sigma-terms and the momentum fraction and helicity are among the quantities we evaluate. We compare the disconnected contributions to the connected ones and give the physical implications on nucleon observables that probe its structure.

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  1. Nucleon axial, tensor and scalar charges and $\sigma$-terms in lattice QCD

    hep-lat 2019-09 conditional novelty 6.0 of 10

    Lattice QCD at physical pion mass with Nf=2+1+1 twisted mass fermions yields g_A^{u-d}=1.286(23), sigma_piN=41.6(3.8) MeV and per-flavor charges including charm.

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