Parton Distribution Function of a Deuteron-like Dibaryon System from Lattice QCD

TL;DR

This paper presents a lattice QCD calculation of the parton distribution function for a deuteron-like dibaryon system, using advanced techniques to handle high momentum states and compare with nucleon PDFs.

Contribution

It introduces a novel lattice QCD approach to compute the PDF of a dibaryon system, including state-of-the-art renormalization and matching procedures.

Findings

The dibaryon PDF differs from the sum of proton and neutron PDFs.

High-momentum modes are effectively extracted using momentum smearing.

The results provide insights into the internal structure of dibaryon systems.

Abstract

We report a lattice QCD calculation of the parton distribution function (PDF) of a deuteron-like dibaryon system using large-momentum effective theory. The calculation is done on three Wilson Clover ensembles with a fixed lattice spacing a=0.105 fm and two pion masses. The lattice matrix elements are computed at proton momenta up to 2.46 GeV with the signal of high momentum modes being improved by applying the momentum smearing technique. The state-of-the-art renormalization, matching and extrapolation are then applied to obtain the final result of the light-cone PDF. A comparison between the result of the dibaryon system and the sum of the proton and neutron PDFs is also given.