Abstract
Few-body Λ hypernuclei provide valuable information towards understanding strange matter. Recent experimental progress by the STAR Collaboration at the RHIC facility and by the ALICE Collaboration at the LHC has been matched by theoretical progress reviewed here: (i) lifetimes of the hypertritonΛ3H,Λ3n if particle-stable,Λ4H andΛ4He and their charge symmetry breaking, and (ii) the onset of ΛΛ hypernuclear binding.
Highlights
Single- and double-Λ hypernuclei provide unique extension of nuclear physics into strange hadronic matter [1]
Meaningful tests of hyperon-nucleon and hyperon-hyperon strong-interaction models are possible in light Λ and ΛΛ hypernuclei, A ≤ 6, which the topics reviewed below are concerned with
Troubling appeared a conference report by Block et al claiming a lifetime of τ(3ΛH)=(95+−1195) ps [3], to be compared with a free Λ lifetime τΛ=(236±6) ps [4] measured in the same He bubble chamber (BC)
Summary
Single- and double-Λ hypernuclei provide unique extension of nuclear physics into strange hadronic matter [1]. The two works listed in the lower part of the table suggest 3ΛH lifetimes shorter than τΛ by more than 20%, owing primarily to πFSI where outgoing-pion plane waves are superseded by realistic pion distorted waves. This enhances Γ(3ΛH) by about 10% [16], or more realistically by 15% [18]. A relatively large reduction of Γ(3ΛH) by ≈10% was found, owing to interference between the Σ → Nπ and Λ → Nπ weak-decay amplitudes This effect was disregarded by Kamada et al [15], thereby rendering their widely cited lifetime questionable. A preliminary value τexp(4ΛH)=180±7 ps (stat. only) was derived in a test run of E73 at J-PARC [30]
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