Flavor Diagonal Nucleon Charges
Sungwoo Park, Tanmoy Bhattacharya, Rajan Gupta, Huey-Wen Lin, Santanu, Mondal, Boram Yoon, Rui Zhang
TL;DR
This paper updates the calculation of flavor diagonal nucleon charges using lattice QCD, focusing on axial, scalar, and tensor matrix elements with improved renormalization and fitting techniques.
Contribution
It presents new lattice QCD results for nucleon charges with detailed analysis of connected and disconnected contributions, renormalization, and systematic uncertainties.
Findings
Updated nucleon charge values with reduced uncertainties
Analysis of connected and disconnected diagram contributions
Implementation of chiral-continuum-finite-volume fits
Abstract
This talk provides an update on the calculation of matrix elements of flavor diagonal axial, scalar and tensor quark bilinear operators between the nucleon ground state. The simulations are done using Wilson-clover fermions on a sea of eight 2+1+1-flavor HISQ ensembles generated by the MILC collaboration. We discuss the signal in the connected and disconnected contributions, calculation of the renormalization constants and mixing in the RI-sMOM scheme, and control over the simultaneous chiral-continuum-finite-volume fit used to extract the final charges.
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Taxonomy
TopicsQuantum Chromodynamics and Particle Interactions · High-Energy Particle Collisions Research · Particle physics theoretical and experimental studies