Abstract
Some of last year’s progress made in hypernuclear physics is reviewed as follows: (i) resolving the He overbinding problem in single-Λ hypernuclei [1]; (ii) arguing that the onset of binding double-Λ hypernuclei is most likely at A=5, with the neutral systems and unbound by a large margin [2]; and (iii) revising the calculated value of the loosely bound lifetime to a level of ∼20% shorter than the free Λ lifetime [3], given recent claims from relativistic heavy ion experiments that τ() is shorter than τΛ by as much as ≈(30±8)%. Also discussed briefly in this context is the lifetime expected for the questionable hypernucleus.
Highlights
Single- and double-Λ hypernuclei provide a unique extension of nuclear physics into strange hadronic matter [4]
Meaningful tests of hyperon-nucleon and hyperon-hyperon strong-interaction models are possible in light Λ and ΛΛ hypernuclei, A ≤ 6, which the three topics reviewed below are concerned with
Using such two-body V2 and three-body V3 regularized contact interaction terms, the A-body Schrodinger equation was solved by expanding the wave function Ψ in a correlated Gaussian basis, using the stochastic variational method (SVM)
Summary
Single- and double-Λ hypernuclei provide a unique extension of nuclear physics into strange hadronic matter [4]. Each LEC is labelled by the total Pauli-spin S and isospin I involved Further contact terms, such as a threebody ΛΛΛ term, appear only at subleading orders. These LECs are fitted to low-energy two-body observables, e.g., to the corresponding N N, ΛN, ΛΛ scattering lengths.
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