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Strangeness -2 hypertriton.

H Garcilazo¹, A Valcarce

¹Escuela Superior de Física y Matemáticas, Instituto Politécnico Nacional, Edificio 9, 07738 México Distrito Federal, Mexico.

Physical Review Letters

|February 7, 2013

Summary

This summary is machine-generated.

Researchers solved the Faddeev equations for the coupled Lambda Lambda N-Xi N N system. They found a bound state for a strangeness -2 hypertriton, suggesting its existence.

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Area of Science:

Nuclear Physics
Hypernuclear Physics
Quantum Chromodynamics

Background:

The existence of hypertritons, particularly those with strangeness -2, remains an open question in nuclear physics.
Understanding multi-baryon systems with strangeness is crucial for refining models of the strong nuclear force.

Purpose of the Study:

To investigate the possibility of a bound strangeness -2 hypertriton using the coupled Lambda Lambda N-Xi N N system.
To determine the binding energy and quantum numbers of this exotic three-baryon system.

Main Methods:

Solving the Faddeev equations for the bound state problem of the coupled Lambda Lambda N-Xi N N system.
Utilizing interactions derived from a chiral quark model that accurately describes low-energy observables for strangeness 0, -1, and -2 two-baryon systems, and strangeness 0 and -1 three-baryon systems.

Main Results:

The Lambda Lambda N system alone was found to be unbound.
However, the inclusion of coupling to the Xi N N system resulted in a bound strangeness -2 three-baryon system with quantum numbers (I,J(P)) = (1/2,1/2(+)).
The calculated binding energy for this system is approximately 0.5 MeV.

Conclusions:

The study provides evidence for the existence of a bound strangeness -2 hypertriton.
The findings are consistent with the nonexistence of a stable (Lambda)(3)H isotope with isospin one.
This work advances the understanding of exotic multi-baryon states and the interactions governing them.