Exotic bound states of two baryons in light of chiral effective field theory

Abstract

Baryon-baryon bound states in the strangeness S=-2, S=-3, and S=-4 sectors are considered. In particular, the dependence of the corresponding binding energies on the quark mass (or equivalently the pion mass) is explored in the framework of chiral effective field theory, in order to connect with current lattice QCD calculations. For a bound state in the Xi-Xi 1S0 channel, predicted by our leading-order effective field theory interaction, binding energies are inferred that are roughly in line with a recent lattice QCD result at meson and baryon masses that correspond to those in the lattice simulation. With regard to the so-called H-dibaryon it is shown that the SU(3) breaking effects induced by the differences of the pertinent two-baryon thresholds (Lambda-Lambda, Xi-N, Sigma-Sigma) have a very pronounced impact on its binding energy. A bound H-dibaryon as found in two lattice calculations could be shifted above the Lambda-Lambda or even above the Xi-N threshold for physical masses of the involved baryons.

15 pages, 5 figures

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Cited by in corpus (31)

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• Exotic Hadrons from Heavy Ion Collisions
• On the History of Dibaryons and their Final Observation
• All the Fun of the FAIR: Fundamental physics at the Facility for Antiproton and Ion Research
• Towards a theory of hadron resonances
• Strangeness S=-2 baryon-baryon interaction at next-to-leading order in chiral effective field theory
• Lattice QCD study of the $H$ dibaryon using hexaquark and two-baryon interpolators
• Coupled-channel effects in hadron-hadron correlation functions
• Hadron-Hadron Correlation and Interaction from Heavy-Ion Collisions
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• In-medium properties of a $\Xi N$ interaction derived from chiral effective field theory
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• The onset of $\Lambda \Lambda$ hypernuclear binding
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