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$\Lambda NN$ and $\Sigma NN$ systems at threshold: II. The effect of D waves

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arxiv 0708.0199 v1 pith:FC7FCOE4 submitted 2007-08-01 hep-ph nucl-th

classification hep-phnucl-th
keywords lambdasigmathresholdlengthscatteringaccountbindingchannel
verification ladder T0 review T1 audit T2 compute T3 formal

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abstract

Using the two-body interactions obtained from a chiral constituent quark model we study all $\Lambda NN$ and $\Sigma NN$ states with I=0,1,2 and J=1/2,3/2 at threshold, taking into account all three-body configurations with S and D wave components. We constrain further the limits for the $\Lambda N$ spin-triplet scattering length a_{1/2,1}. Using the hypertriton binding energy we find a narrow interval for the possible values of the $\Lambda N$ spin-singlet scattering length a_{1/2,0}. We found that the $\Sigma NN$ system has a quasibound state in the (I,J) = (1,1/2) channel very near threshold with a width of about 2.1 MeV.

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  1. Hypernuclei with Neural Network Quantum States

    nucl-th 2025-07 conditional novelty 6.0 of 10

    Neural network quantum states, extended to include Lambda hyperons, reproduce hypernuclear separation energies to within roughly 9% and predict the observed proton-radius shrinkage in 7ΛLi.

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