The $π^+$--emission puzzle in $^4_Λ$He decay

Details The $π^+$--emission puzzle in $^4_Λ$He decay The $π^+$--emission puzzle in $^4_Λ$He decay

1997-11-26

arxiv.org/abs/nucl-th/9711054v1

Nucl.Phys. A628 (1998) 417-426

Physics

Nuclear Physics

Nuclear Theory

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

Scientific paper

10.1016/S0375-9474(97)00642-8

We re-examine the puzzling $\pi^+$ emission from the weak decay of $^4_\Lambda$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.

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