First observation of the hidden-charm pentaquarks on lattice
Hanyang Xing, Jian Liang, Liuming Liu, Peng Sun, Yi-Bo Yang

TL;DR
This study uses lattice QCD to observe bound states in the $ ext{Σ}_c ar{ ext{D}}$ and $ ext{Σ}_c ar{ ext{D}}^*$ channels, providing evidence for hidden-charm pentaquarks related to experimentally observed states.
Contribution
First lattice QCD calculation demonstrating bound states corresponding to hidden-charm pentaquarks near experimental masses.
Findings
Bound states found in both channels near experimental pentaquark masses
Binding energies of approximately 6-7 MeV with quantified errors
Results support the interpretation of observed pentaquarks as molecular states
Abstract
The s-wave scattering of and in the channel is calculated in lattice QCD using two ensembles with different volumes but the same lattice spacing and pion mass . The scattering amplitudes near threshold are obtained by L\"uscher's finite volume method. We find bound state poles in both and channels, which are possibly related to the and pentaquarks observed in experiments. The binding energy is MeV for and MeV for , where the first error is the statistical error and the second is the systematic error due to the lattice artifacts.
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Taxonomy
TopicsQuantum Chromodynamics and Particle Interactions · Physics of Superconductivity and Magnetism · Cold Atom Physics and Bose-Einstein Condensates
