| Autor: |
Ichikawa, Yudai, Ahn, Jung Keun, Akazawa, Yuya, Aoki, Kanae, Botta, Elena, Ekawa, Hiroyuki, Evtoukhovitch, Petr, Feliciello, Alessandro, Fujita, Manami, Gogami, Toshiyuki, Hasegawa, Shoichi, Hasegawa, Tomoyuki, Hayakawa, Shuhei, Hayakawa, Tomonori, Honda, Ryotaro, Hosomi, Kenji, Imai, Ken'ichi, Jung, Wooseung, Kanatsuki, Shunsuke, Kim, Shin Hyung |
| Předmět: |
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| Zdroj: |
Progress of Theoretical & Experimental Physics: PTEP; Sep2024, Vol. 2024 Issue 9, p1-13, 13p |
| Abstrakt: |
We performed a measurement of the inclusive missing-mass spectrum of the |$^{12}$| C |$(K^-, K^+)$| reaction at an incident beam momentum of 1.8 GeV/ c. This measurement was carried out by using the Superconducting Kaon Spectrometer (SKS) and the K1.8 beamline spectrometer at the Hadron Experimental Facility in J-PARC. From the missing-mass of the |$^{12}$| C |$(K^-, K^+)$| reaction, the binding energy of a |$\Xi ^-$| hyperon in a core |$^{11}$| B nucleus, |$B_{\Xi ^-}$| , can be calculated. Our experimental setup yielded a good energy resolution of 8.2 MeV (full width at half maximum), which allowed us to observe significant enhancements in the proximity of the |$^{12}_{\Xi }$| Be production threshold region. In order to extract information from the missing-mass spectrum, we employed several fitting parameters assumptions. A good agreement with the spectrum shape was obtained by adding two Gaussian functions, with the constant experimental resolution for the |$\Xi$| -hypernuclear states, to the background distribution. The peak positions were obtained to be |$B_{\Xi ^-} = 8.9 \pm 1.4$| (stat.) |$^{+3.8}_{-3.1}$| (syst.) MeV and |$B_{\Xi ^-} = -2.4 \pm 1.3$| (stat.) |$^{+2.8}_{-1.2}$| (syst.) MeV. Another model assumption, one Breit–Wigner function with |$B_{\Xi ^-} = -2.7 \pm 2.2$| (stat.) |$^{+0.5}_{-0.7}$| (syst.) MeV and |$\Gamma = 4.1 \pm 2.1$| (stat.) |$^{+1.2}_{-0.7}$| (syst.) MeV, also yielded a similar |$\chi ^2$| value. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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