Disconnected diagrams with twisted-mass fermions

TL;DR

This paper presents recent results on disconnected diagrams in lattice QCD using twisted-mass fermions, focusing on nucleon sigma terms, axial charges, and momentum fractions, with detailed error analysis and discussion of methodological alternatives.

Contribution

It provides new lattice QCD results for nucleon observables at physical pion mass using twisted-mass fermions, including an evaluation of the one-end trick and alternative methods.

Findings

Results for nucleon sigma terms, axial charges, and momentum fractions at physical pion mass.

Analysis of the strengths and weaknesses of the one-end trick.

Discussion of alternative computational strategies.

Abstract

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.