A look inside charmed-strange baryons from lattice QCD

Abstract

The electromagnetic form factors of the spin-3/2 $\Omega$ baryons, namely $\Omega$, ${\Omega }_c^{\ast }$, ${\Omega }_{cc}^{\ast }$ and ${\Omega }_{ccc}$, are calculated in full QCD on $32^3\times 64$ PACS-CS lattices with a pion mass of 156(9) MeV. The electric charge radii and magnetic moments from the $E0$ and $M1$ multipole form factors are extracted. Results for the electric quadrupole form factors, $E2$, are also given. Quark sector contributions are computed individually for each observable and then combined to obtain the baryon properties. We find that the charm quark contributions are systematically smaller than the strange-quark contributions in the case of the charge radii and magnetic moments. $E2$ moments of the ${\Omega }_{cc}^{\ast }$ and ${\Omega }_{ccc}$ provide a statistically significant data to conclude that their electric charge distributions are deformed to an oblate shape. Properties of the spin-1/2 ${\Omega }_c$ and ${\Omega }_{cc}$ baryons are also computed and a thorough comparison is given. This complete study gives valuable hints about the heavy-quark dynamics in charmed hadrons.

arXiv comment14 pages, 14 figures. Includes a subsection on the systematic effects

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• Hadrons and Nuclei
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• Lattice QCD study of the elastic and transition form factors of charmed baryons
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• Magnetic moments of the spin-$\frac{3}{2}$ doubly charmed baryons in covariant baryon chiral perturbation theory
• ${\Lambda }_c{\Sigma }_c\pi$ coupling and ${\Sigma }_c\to {\Lambda }_c\pi$ decay in lattice QCD
• Triply heavy baryon spectroscopy revisited
• Electric quadrupole form factors of singly heavy baryons with spin 3/2
• Chromopolarizabilities of fully-heavy baryons
• Systematic analysis of the mass spectra of triply heavy baryons
• Lattice QCD and Baryon-Baryon Interactions
• Electromagnetic Structure of Spin-$\frac{1}{2}$ Doubly Charmed Baryons in Lattice QCD
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• Structure of heavy baryons in a pion mean-field approach
• Electromagnetic polarizabilities of the triplet hadrons in heavy hadron chiral perturbation theory
• Spectroscopy and Radiative Decays of ${\Omega }_{ccc}$ and ${\Omega }_{bbb}$ Baryons in a Quark-Diquark Model
• Wavefunction-based operator optimization for two-hadron systems in lattice QCD