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Disconnected diagrams with twisted-mass fermions

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arxiv 1611.03802 v1 pith:BQEPJZ2W submitted 2016-11-11 hep-lat

Abdou Abdel-Rehim , Constantia Alexandrou , Martha Constantinou , Jacob Finkenrath , Kyriakos Hadjiyiannakou , Karl Jansen , Christos Kallidonis , Giannis Koutsou
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Alejandro Vaquero Avilés-Casco
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keywords diagramsdisconnectedtwisted-massalternativesanalysisaxialchargescollaboration
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The latest results from the Twisted-Mass collaboration on disconnected diagrams at the physical value of the pion mass are presented. In particular, we focus on the sigma terms, the axial charges and the momentum fraction, all of them for the nucleon. A detailed error analysis for each observable follows, showing the strengths and weaknesses of the one-end trick. Alternatives are discussed.

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  1. Nucleon charges and $\sigma$-terms in lattice QCD

    hep-lat 2024-12 conditional novelty 5.0 of 10

    First-principles lattice QCD at the physical pion mass yields nucleon charges and sigma-terms in the continuum limit, with g_A^{u-d}=1.250(24) matching experiment.

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