Quasi-PDFs with twisted mass fermions

TL;DR

This paper reports progress in extracting partonic functions from lattice QCD using twisted mass fermions, focusing on systematic effects, new simulations at physical parameters, and initial GPD results.

Contribution

It introduces new lattice simulations at physical quark masses with dynamical strange and charm quarks, and explores systematic effects in the quasi-distribution approach.

Findings

Preliminary results for PDFs at the physical point.

Analysis of systematic effects in the matching procedure.

First computations of GPDs using quasi-distributions.

Abstract

We discuss the recent progress in extracting partonic functions from the quasi-distribution approach, using twisted mass fermions. This concerns, among others, the investigation of several sources of systematic effects. Their careful analysis is a prerequisite to obtain precise determinations of PDFs from the lattice with realistic estimates of all uncertainties. In these proceedings, we shortly discuss systematic effects in the matching procedure. Moreover, we present preliminary results from our new simulations at the physical point. They involve, additionally, the dynamical strange and charm quarks, as well as a larger volume and a smaller lattice spacing than in our previous computations. In addition, we show first results from computations of generalized parton distributions (GPDs) in the quasi-distribution framework.