2026-04-16T16:59:40Z https://meral.edu.mm/oai

oai:meral.edu.mm:recid/728 2021-12-13T04:59:51Z 1582963739756:1582967025340 user-um

Trapping probability of strangeness via Xi− hyperon capture at rest in nuclear emulsion Aye Moh Moh Theint Ekawa, Hiroyuki Kasagi, Ayumi Kinbara, Shinji May Sweet Khin Than Tint Yoon, Chun Sil Yoshida, Junya Yoshimoto, Masahiro Nakazawa, Kazuma In the E373 experiment at KEK-PS, we have located nearly 2 × 104 stopping events of Ξ− hyperon candidates in nuclear emulsion. Among these, the identification of the Ξ− hyperon was performed with the constant sagitta (CS) method, by measuring multiple Coulomb scattering for 695 clear stopping events, σ-stop, with emission of nuclear fragments due to negatively charged hadrons. With use of a Geant4 simulation, the parameters for the CS method were optimized and we obtained the number of real Ξ− stopping events to be 432.3±7.6+ 0.0−14.0 with 3.2% systematic error by contamination by the Σ− hyperon. We have classified the events for Ξ− hyperon capture by light (C, N, O) and heavy (Ag, Br) elements in the emulsion. The trapping probabilities of two Λ hyperons for light and heavy nuclei were found to be 5.0±1.7% and 4.2±1.4%⁠, respectively, for σ-stop via Ξ− hyperon capture at rest in the emulsion. For at least one Λ trapping, the probabilities were 69.4±8.1% for light nuclei and 51.1±5.7% for heavy nuclei. These results allow us to present the trapping probabilities of Λ hyperons via Ξ− hyperon capture at rest in emulsion for the first time, because the previous E176 experiment showed the lower limits due to fewer statistics. 2019 http://hdl.handle.net/20.500.12678/0000000728 https://meral.edu.mm/records/728