Moments of Structure Functions in Full QCD

TL;DR

This paper computes moments of various structure functions and tensor charge in full QCD using lattice simulations, including renormalization, and compares results with quenched and cooled configurations.

Contribution

It presents the first full QCD lattice calculations of structure function moments and tensor charge with perturbative renormalization and comparison to quenched results.

Findings

Full QCD results differ from quenched calculations.

Inclusion of one-loop renormalization improves accuracy.

Comparison with cooled configurations highlights effects of dynamical quarks.

Abstract

Moments of the quark density distribution, moments of the quark helicity distribution, and the tensor charge are calculated in full QCD. Calculations of matrix elements of operators from the operator product expansion have been performed on $16^3 \times 32$ lattices for Wilson fermions at $\beta = 5.6$ using configurations from the SESAM collaboration and at $\beta = 5.5$ using configurations from SCRI. One-loop perturbative renormalization corrections are included. Selected results are compared with corresponding quenched calculations and with calculations using cooled configurations.