Update on Flavor Diagonal Nucleon Charges
Sungwoo Park, Tanmoy Bhattacharya, Rajan Gupta, Huey-Wen Lin, Santanu, Mondal, Boram Yoon
TL;DR
This paper updates the calculation of flavor diagonal nucleon charges for axial, scalar, and tensor operators using lattice QCD simulations, improving the understanding of nucleon structure relevant to fundamental physics and beyond Standard Model searches.
Contribution
It provides new lattice QCD results for nucleon charges with improved control over systematic uncertainties, using advanced simulation techniques and analysis methods.
Findings
Updated values for nucleon axial, scalar, and tensor charges.
Enhanced control over excited state contamination.
Results based on simulations with Wilson-clover fermions on HISQ ensembles.
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 sum of the connected and disconnected contributions for the up, down and strange quarks, control over fits to remove excited state contamination, and the simultaneous chiral-continuum fit used to extract the charges.
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Taxonomy
TopicsQuantum Chromodynamics and Particle Interactions · Particle physics theoretical and experimental studies · Superconducting Materials and Applications