4 papers
Total Gluon Helicity Contribution to the Proton Spin from Lattice QCD
Dian-Jun Zhao, Long Chen, Hongxin Dong +8
We report a state-of-the-art lattice QCD calculation of the total gluon helicity contribution to the proton spin, . The calculation is done on ensembles with three different la…
On-shell Matrix Elements of the EMT Trace in Gauge Theories and Heavy Quark Masses
Long Chen, Zhe Li, Marco Niggetiedt
We present a novel diagrammatic proof of the identity between the forward matrix element of the energy-momentum-tensor (EMT) trace operator over a single particle's on-shell state…
Three-loop QCD Mass Relation between the and Symmetric-momentum Subtraction Scheme Away from the Chiral Limit
Long Chen, Marco Niggetiedt
The perturbative result for the quark-mass conversion factor between the and regularization-independent symmetric-momentum subtraction scheme (RI/SMOM) awa…
Renormalization of the pseudoscalar operator at four loops in QCD
Long Chen, Michał Czakon, Marco Niggetiedt
We present the renormalization constant of the pseudoscalar operator defined with a non-anticommuting in dimensional regularization up to four-loop order in perturbative Quan…