Importance of Baryon-Baryon Coupling in Hypernuclei

Abstract

The $\Lambda N-\Sigma N$ coupling in $\Lambda$--hypernuclei and $\Lambda \Lambda -\Xi N$ coupling in $\Lambda \Lambda$--hypernuclei produce novel physics not observed in the conventional, nonstrange sector. Effects of $\Lambda \leftrightarrow \Sigma$ conversion in ${}_{\Lambda }^3$H are reviewed. The role of $\Lambda N-\Sigma N$ coupling suppression in the $A=4,5$ $\Lambda$--hypernuclei due to Pauli blocking is highlighted, and the implications for the structure of ${}_{\Lambda }^{10}$B are explored. Suppression of $\Lambda \Lambda -\Xi N$ conversion in ${}_{\Lambda \Lambda }^6$He is hypothesized as the reason that the $<V_{\Lambda \Lambda }>$ matrix element is small. Measurement of ${}_{\Lambda \Lambda }^4$H is proposed to investigate the full $\Lambda \Lambda -\Xi N$ interaction. The implication for $\Lambda \Lambda$ analog states is discussed.

Comments: 17 pages LATEX, 1 figure uuencoded postscript