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論文

Further signatures to support the tetraquark mixing framework for the two light-meson nonets

Kim, H.*; Kim, K. S.*; Cheoun, M.-K.*; 慈道 大介*; 岡 眞

Physical Review D, 99(1), p.014005_1 - 014005_15, 2019/01

 パーセンタイル:100(Astronomy & Astrophysics)

前回の論文で指摘した、軽いスカラー中間子8重項のテトラクォーク描像に基づく状態混合について、さらなる証拠となる現象の解析を行った。

論文

Cosmic-ray test of a time-of-flight detector for double-strangeness experiments at J-PARC

Kim, S. H.*; Hwang, S.; Ahn, J. K.*; 江川 弘行; 早川 修平; Hong, B.*; 細見 健二; 今井 憲一; Kim, M. H.*; Lee, J. Y.*; et al.

Nuclear Instruments and Methods in Physics Research A, 795, p.39 - 44, 2015/09

 被引用回数:1 パーセンタイル:81.41(Instruments & Instrumentation)

We have developed a time-of-flight (ToF) array consisting of 24 plastic scintillators for triggering and timing measurements in a series of planned experiments to study double-strangeness hadronic and nuclear systems at the K1.8 beamline of J-PARC. Each ToF scintillator is 180 cm long with a cross-section of 8$$times$$3 cm$$^{2}$$ and is read out by H1949-50 photomultiplier tubes at both ends. The timing and attenuation properties of the scintillators are measured using cosmic-ray muons and $$beta$$ rays from $$^{90} {rm Sr}$$. The cosmic-ray muon events are triggered by three pairs of 120-cm-long plastic scintillators, sandwiching the ToF array. The intrinsic time resolutions of the scintillators are estimated to be in the range 60-100 ps, which is adequate for reliable separation between $$pi$$ and $$K$$ at 1.2 GeV/$$c$$. The attenuation length is measured to be approximately 210 cm, which is half that for a bulk scintillator.

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