XVIth Quark Confinement and the Hadron Spectrum

Double-Strangeness Production in (K−,K+) Reaction

22 Aug 2024, 16:50

20m

Plenary 1

Oral B: Light Quarks Light Quarks

Speaker

Wooseung ‍Jung (Korea University)

Description

We measured double-strangeness systems produced in the ${}^{12}C(K^{-},K^{+})X$ reaction which involves a ${\mathrm{\Xi }}^{-}$ hyperon and a $\mathrm{\Lambda }\mathrm{\Lambda }$ hyperon pair at the J-PARC using 1.8 GeV/$\mathit{c}$ $K^{-}$ beam.  
The E42 experiment which has a primary goal to search for the H-dibaryon collected 300K ${}^{12}C(K^{-},K^{+})X$ reaction events containing thousands of $\mathrm{\Lambda }\mathrm{\Lambda }$ events which is two orders of magnitude larger then ever.
In the high-momentum region of outgoing $K^{+}$ particles, low-momentum ${\mathrm{\Xi }}^{-}$ hyperons are produced in the $(K^{-},K^{+})$ reaction. Such a slow ${\mathrm{\Xi }}^{-}$ hyperon may have high probability to stick up to the nucleus. It will be ended up with $\mathrm{\Xi }N$ elastic scattering, ${\mathrm{\Xi }}^{-}p\to {\mathrm{\Xi }}^{0}n$ charge exchange reaction, or ${\mathrm{\Xi }}^{-}p\to \mathrm{\Lambda }\mathrm{\Lambda }$ conversion process, unless the ${\mathrm{\Xi }}^{-}$ escapes from the nucleus. 
The cross-section measurement of ${}^{12}C(K^{-},K^{+}{\mathrm{\Xi }}^{-})$ and ${}^{12}C(K^{-},K^{+}\mathrm{\Lambda }\mathrm{\Lambda })$ reactions will provide crucial information on the ${\mathrm{\Xi }}^{-}-N$ potential strengths and the cross-section ratio of individual processes. This talk will report the first cross-section measurement results for ${}^{12}C(K^{-},K^{+}{\mathrm{\Xi }}^{-})$ and ${}^{12}C(K^{-},K^{+}\mathrm{\Lambda }\mathrm{\Lambda })$ reactions at 1.8 GeV/$\mathit{c}$.

Presentation materials

20240822_confinement2024_WSJung.pdf