Evidence for diquarks in lattice QCD
C. Alexandrou (Univ. of Cyprus), Ph. de Forcrand (CERN & ETH Zurich), and B.Lucini (Univ. of Swansea)
TL;DR
This study provides lattice QCD evidence supporting the existence of diquark correlations, highlighting the scalar diquark as the lightest and measuring its size, which has implications for hadron structure and QCD phenomena.
Contribution
The paper systematically investigates diquark channels in lattice QCD, demonstrating the scalar diquark's lightest mass and quantifying its size, a novel comprehensive analysis in this area.
Findings
Scalar diquark is the lightest diquark channel.
Diquark size is approximately 1 fm.
Clear quark-quark correlations observed in the scalar channel.
Abstract
Diquarks may play an important role in hadron spectroscopy, baryon decays and color superconductivity. We investigate the existence of diquark correlations in lattice QCD by considering systematically all the lowest energy diquark channels in a color gauge-invariant setup. We measure mass differences between the various channels and show that the positive parity scalar diquark is the lightest. Quark-quark correlations inside the diquark are clearly seen in this channel, and yield a diquark size of order 1 fm.
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