Speaker
Description
All five KEK and J-PARC two-body $\Xi^-$ capture events in light emulsion nuclei to single $\Lambda$
hypernuclei are consistent with Coulomb-assisted $1p_{\Xi^-}$ nuclear states. The underlying
$\Xi$-nuclear potential is strongly attractive
with nuclear-matter depth $V_{\Xi}\geq 20$ MeV [1], considerably larger than suggested by recent
LQCD, femtoscopy and EFT theoretical studies.
We argue that the J-PARC E07 new $^{14}$N capture events assigned to $1s_{\Xi^-}$ nuclear states, thereby implying considerably shallower $V_{\Xi}$,
have also another interpretation as $1p_{\Xi^0}$ nuclear states [2].
Time permitting, several other Strangeness $-$2
nuclear systems will be discussed briefly.
[1] E. Friedman, A. Gal, Constraints on $\Xi^-$ nuclear interactions from capture events in emulsion, Phys. Lett. B 820, 136555 (2021).
[2] E. Friedman, A. Gal, Has J-PARC E07 observed
a $\Xi^-_{1s}$ nuclear state?, Phys. Lett. B 837,
137640 (2022).