Deciphering ${\Xi }^{-}$ capture events in light emulsion nuclei

Abstract

We recently showed that all five KEK and J-PARC uniquely assigned two-body ${\Xi }^{-}$+${}^A$Z$\to {}_{\Lambda }^{A^{\prime }}$Z'+${}_{\Lambda }^{A^{\prime \prime }}$Z'' capture events in CNO light emulsion nuclei are consistent with Coulomb-assisted $1p_{{\Xi }^{-}}$ nuclear states in a $\Xi$-nuclear potential of nuclear-matter depth $V_{\Xi }\gtrsim 20$ MeV [1]. Here we argue that the recently reported ${}^{14}$N capture events named KINKA and IRRAWADDY are more likely $1p_{{\Xi }^0}$--${}^{14}$C nuclear states [2] than $1s_{{\Xi }^{-}}$--${}^{14}$N states, the latter assignment implying considerably smaller values of $V_{\Xi }$.

6 pages, 3 figures, 2 tables; invited talk at MESON2023, Krakow, June 2023, plus updated discussion section; v1: as submitted to EPJ Web of Conferences; v2: updated, published version

References in corpus (7)

• Observation of Coulomb-assisted nuclear bound state of ${\Xi }^{-}$-${}^{14}$N system
• First observation of a nuclear $s$-state of $\Xi$ hypernucleus, ${}_{\Xi }^{15}\mathrm{C}$
• Constraints on ${\Xi }^{-}$ nuclear interactions from capture events in emulsion
• Constraints from $\Lambda$ hypernuclei on the $\Lambda NN$ content of the $\Lambda$-nucleus potential
• $\Lambda$ hypernuclear potentials beyond linear density dependence
• Momentum dependent mean-fields of (anti)hyperons
• Has J-PARC E07 observed a ${\Xi }_{1s}^{-}$ nuclear state?

Cited by in corpus (1)

• Compatibility of recent $\Xi$-nuclear bound state signals