论文标题
J-PARC E07是否观察到$ξ^-_ {1S} $核状态？
Has J-PARC E07 observed a $Ξ^-_{1s}$ nuclear state?
论文作者
论文摘要
奇怪的$ {\ cal s} = - 2 $ j-parc e07乳液实验，最近发布了两个新的$ξ^ - $ - $ - $ - $ - $ - $ - $ n捕获事件，irrawaddy和ibuki，通过观察弱点序列，单$ $λ$ nuclei和$λ$ hypernuclei，并解释为$ hypereple as $ and as $ a $ $ b_ {1p} $核约束状态分别具有绑定能量$ b_ {ξ^ - }^{1S} $ = 6.27 $ \ pm $ 0.27 meV和$ b_ {ξ^ - }^ - }^ - }^ - }^{1p}^{1p} $ = 1.27 $ = 1.27 $ \ pm $ 0.21 mev。 $ξ^ - $^乳液中的捕获事件在确定$ξ$ - 核和$λλ$潜在优势方面起着重要作用。在这里，我们质疑$ξ^{ - } _ {1s} $核定状态到Irrawaddy的核定状态，并提供另一种分配，作为接近阈值的$ξ^0_ {1p} $ - $^{14} $核核定状态，用$ξ^^{ - } $ n种子略微粘合伊布基。我们还使用Ibuki的$ b_ {ξ^ - }^{1p} $ value询问，以确定$ξ$ - 核势深度。总的来说，$^{12} $ c和$^{16} $ o中的$ξ^ - $捕获事件应该比$^{14} $ n中的模棱两可。
The Strangeness ${\cal S}=-2$ J-PARC E07 emulsion experiment published recently two new $Ξ^-$--$^{14}$N capture events, IRRAWADDY and IBUKI, identified by observing weak-decay sequences of pairs of single-$Λ$ hypernuclei and interpreted as $Ξ^{-}_{1s}$ and $Ξ^{-}_{1p}$ nuclear bound states, respectively, with binding energies $B_{Ξ^-}^{1s}$=6.27$\pm$0.27 MeV and $B_{Ξ^-}^{1p}$=1.27$\pm$0.21 MeV. $Ξ^-$ capture events in emulsion play a major role in determining the $Ξ$-nuclear and the $ΛΛ$ potential strengths. Here we question the assignment of a $Ξ^{-}_{1s}$ nuclear bound state to IRRAWADDY and offer an alternative assignment as a near-threshold $Ξ^0_{1p}$--$^{14}$C nuclear bound state, slightly admixed with a $Ξ^{-}_{1p}$--$^{14}$N nuclear bound state component corresponding to IBUKI. We also question using IBUKI's $B_{Ξ^-}^{1p}$ value as is to determine the $Ξ$-nuclear potential depth. Altogether, $Ξ^-$ capture events in $^{12}$C and $^{16}$O should prove less ambiguous than in $^{14}$N.
