The ${\pi }^{+}$--emission puzzle in ${}_{\Lambda }^4$He decay

Abstract

We re-examine the puzzling ${\pi }^{+}$ emission from the weak decay of ${}_{\Lambda }^4$He and propose an explanation in terms of a three-body decay of the virtual ${\Sigma }^{+}$. Such a resolution of the ${\pi }^{+}$ decay puzzle is consistent with the calculated ${\Sigma }^{+}$ probability in light $\Lambda$ hypernuclei as well as the experimentally observed ${\pi }^{+}$ energy spectrum and $s$--wave angular distribution.

16 pages, Revtex, 2 figures, amstex and amssymb style files

References in corpus (1)

• ${}_{\Lambda \Lambda }^6$He as a $\Lambda \Lambda$ interaction constraint

Cited by in corpus (6)

• Strangeness in nuclear physics
• The Hypernuclei ${}_{\Lambda }^4$He and ${}_{\Lambda }^4$H: Challenges for Modern Hyperon-Nucleon Forces
• Hyperonic mixing in five-baryon double-strangeness hypernuclei in a two-channel treatment
• ${\pi }^{+}$ Emission from Hypernuclei and the Weak $\Delta I=3/2$ Transitions
• Isospin breaking from diquark clustering
• Weak Chiral Lagrangian and $p{i}^{+}$ Emission in ${}_{Lambda}^4$He