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Lattice QCD study of positive parity dibaryons with maximal charm and strangeness

Navdeep Singh Dhindsa1,*, Nilmani Mathur2,†, and M. Padmanath1,3,‡

  • *Contact author: navdeep.s.dhindsa@gmail.com
  • †Contact author: nilmani@theory.tifr.res.in
  • ‡Contact author: padmanath@imsc.res.in
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Phys. Rev. D 112, 054501 – Published 2 September, 2025

DOI: https://doi.org/10.1103/gnkg-8lyz

Abstract

We present the ground-state energy spectra of dibaryons composed of single-flavor quarks, specifically systems with strangeness S=−6 and charm C=6. Our lattice QCD study is based on Nf=2+1+1 MILC ensembles with highly improved staggered quark sea quarks, spanning four lattice spacings and two spatial volumes. We employ valence quark propagators realized using a relativistic overlap action, evaluate correlation matrices with carefully designed operator bases, and extract reliable ground-state energy estimates in the S=0 and S=2 spin channels. We explore their binding characteristics and interaction dynamics by examining the energy separation between the dibaryon states and the corresponding two-baryon thresholds. These results contribute to a deeper understanding of single-flavor dibaryon states as a function of the quark masses. In the S=0 channel, the Ωccc−Ωccc system exhibits a clear signal of a bound state, while the Ω−Ω system lies very close to the threshold, making it difficult to draw definitive conclusions. For S=2, both systems are found to be unbound.

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Phys. Rev. D 112, 054501– Published 2 September, 2025
  • Received 23 July 2025
  • Accepted 15 August 2025
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