التفاصيل البيبلوغرافية
| العنوان: |
Trapping probability of strangeness via Xi − hyperon capture at rest in nuclear emulsion. |
| المؤلفون: |
Theint, Aye Moh Moh, Ekawa, Hiroyuki, Kasagi, Ayumi, Kinbara, Shinji, Sweet, May, Tint, Khin Than, Yoon, Chun Sil, Yoshida, Junya, Yoshimoto, Masahiro, Nakazawa, Kazuma |
| المصدر: |
Progress of Theoretical & Experimental Physics: PTEP; Feb2019, Vol. 2019 Issue 2, pN.PAG-N.PAG, 1p |
| مصطلحات موضوعية: |
STRANGE particles, TRAPPED-particle instabilities, NUCLEAR emulsions, NUCLEAR fragmentation, BARYONS |
| مستخلص: |
In the E373 experiment at KEK-PS, we have located nearly 2 |$\times$| 10 |$^4$| stopping events of |${\Xi^-}$| hyperon candidates in nuclear emulsion. Among these, the identification of the |${\Xi^-}$| hyperon was performed with the constant sagitta (CS) method, by measuring multiple Coulomb scattering for 695 clear stopping events, |$\sigma$| -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 |${\Xi^-}$| stopping events to be |$432.3 \pm 7.6 ^{+~0.0}_{-14.0}$| with 3.2% systematic error by contamination by the |$\Sigma^-$| hyperon. We have classified the events for |${\Xi^-}$| hyperon capture by light (C, N, O) and heavy (Ag, Br) elements in the emulsion. The trapping probabilities of two |${\Lambda}$| hyperons for light and heavy nuclei were found to be |$5.0 \pm 1.7\%$| and |$4.2 \pm 1.4\%$|, respectively, for |$\sigma$| -stop via |${\Xi^-}$| hyperon capture at rest in the emulsion. For at least one |${\Lambda}$| trapping, the probabilities were |$69.4 \pm 8.1\%$| for light nuclei and |$51.1 \pm 5.7\%$| for heavy nuclei. These results allow us to present the trapping probabilities of |${\Lambda}$| hyperons via |${\Xi^-}$| hyperon capture at rest in emulsion for the first time, because the previous E176 experiment showed the lower limits due to fewer statistics. [ABSTRACT FROM AUTHOR] |
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