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論文

Exact vector channel sum rules at finite temperature

Gubler, P.; 佐藤 大輔*

JPS Conference Proceedings (Internet), 26, p.024023_1 - 024023_5, 2019/11

本講演では最近の発表論文に基づき、vectorチャンネル(光子と同じ量子数を持つ状態)のスペクトル関数に関して導出したいくつかの厳密な和則を紹介する。摂動計算ではこの和則が成り立つことや、格子QCDへの応用についても議論する。

論文

Radiative transitions of singly and doubly charmed baryons in lattice QCD

Bahtiyar, H.*; Can, K. U.*; Erkol, G.*; 岡 眞; 高橋 徹*

JPS Conference Proceedings (Internet), 26, p.022027_1 - 022027_4, 2019/11

スピン3/2の1重および2重チャームバリオンからスピン1/2の基底状態への光遷移振幅を格子QCDによる第一原理計算を用いて求めた。

論文

Spectrum of the charmed baryons in 2+1-flavor lattice QCD

Can, K. U.*; Bahtiyar, H.*; Erkol, G.*; Gubler, P.; 岡 眞; 高橋 徹*

JPS Conference Proceedings (Internet), 26, p.022028_1 - 022028_5, 2019/11

格子QCDによる第一原理計算を用いて、チャームバリオンの基底および励起状態のスペクトルを求めた。

論文

A $$Sigma p$$ scattering experiment at J-PARC and the analysis status

中田 祥之*; 長谷川 勝一; 早川 修平*; 細見 健二; 市川 裕大; 今井 憲一; 七村 拓野*; 成木 恵*; 佐甲 博之; 佐藤 進; et al.

JPS Conference Proceedings (Internet), 26, p.023024_1 - 023024_5, 2019/11

J-PARC E40 aims to measure the differential cross sections of the $$Sigma^{pm}p$$ elastic scatterings and the $$Sigma^-p to Lambda n$$ conversion. A clear peak of $$Sigma^-$$ was observed in a missing mass spectrum of the $$pi^-pto K^+X$$ reaction and recoil protons from the $$pi p$$ elastic scattering were successfully observed in the data taken in the summer 2018. The rest of data taking is coming in the spring 2019.

論文

First $$gamma$$-ray spectroscopy of an $$sd$$-shell hypernucleus, $$^{19}_{Lambda}$$F

Yang, S. B.*; 長谷川 勝一; 早川 修平*; 細見 健二; 市川 裕大; 今井 憲一; 佐甲 博之; 佐藤 進; 田村 裕和*; 谷田 聖; et al.

JPS Conference Proceedings (Internet), 26, p.023015_1 - 023015_5, 2019/11

We performed a gamma-ray spectroscopy of $$({}_{Lambda}^{19}{rm F})$$ at J-PARC Hadron Experimental Facility in 2015. It is the first measurement of $$gamma$$ rays emitted from $$sd$$-shell hypernuclei. In this experiment, we determined the energy spacing between the ground state spin doublet, $$3/2^+$$ and $$1/2^+$$ states, as 316 keV. The excitation energies of $$5/2^+$$ and $$1/2^+$$ states are also determined to be 895 and 1266 keV, respectively. The energy spacing is found to be well reproduced by shell-model calculations which describe $$s$$- and $$p$$-shell $$Lambda$$ hypernuclei well. The results show that the present theories of the $$Lambda N$$ interaction describe not only the light hypernuclei but also a heavier hypernucleus.

論文

Study of $$Y^*$$ in nuclei through C$$(K^-, pi^+)X$$ spectrum at 1.8 GeV/$$c$$ in the J-PARC E05 experiment

本多 良太郎*; 長谷川 勝一; 早川 修平; 細見 健二; 今井 憲一; 市川 裕大; 七村 拓野; 成木 恵; 佐甲 博之; 佐藤 進; et al.

JPS Conference Proceedings (Internet), 26, p.023014_1 - 023014_4, 2019/11

We measured the $$(K^-,pi^+)$$ reaction spectra at 1.8 GeV/$$c$$ for the graphite and the polyethylene targets in the J-PARC E05 pilot experiment. By comparing the spectra for these two targets, it was found that $$Sigma^{*-}(1385)$$ in the $$^{11}$$B nucleus is quite broadened. Furthermore, we also compared broadness of $$Sigma^{*-}(1385)$$ with $$K^*(892)$$ obtained in the $$(K^-,p)$$ spectrum. $$Sigma^{*-}(1385)$$ seems to be much more broadened in nuclei than $$K^*(892)$$. We gave a possible interpretation, which is related to compositeness of decuplet baryons, for this situation.

論文

Results of $$bar{K}NN$$ search via the $$(K^-, n)$$ reaction at J-PARC

山我 拓巳*; 橋本 直; 谷田 聖; 他66名*

JPS Conference Proceedings (Internet), 26, p.023008_1 - 023008_6, 2019/11

There is a long-standing argument of the existence of kaonic nucleus, which is a bound state of anti-kaon and nucleus. Theoretically, its existence is strongly supported, however its binding energy and width have not been established yet. It is strongly desired to have an experiment to investigate the simplest kaonic nucleus, so-called $$K^-pp$$ bound state. We performed an experiment to search for $$K^-pp$$ via the in-flight $$(K^-, n)$$ reaction at J-PARC. By studying $$Lambda p$$ invariant mass spectrum in the $$Lambda pn$$ final state and its dependence on momentum transfer of $$K^{-}N to bar{K}N$$, we observed a resonant state located below $$M_{K^{-}pp}$$. The mass and width of this resonant state are $$2324 pm 3(textit{stat}.)_{-3}^{+6}(textit{syst}.)$$ MeV/$$c^2$$, and $$115 pm 7(textit{stat}.)_{-20}^{+10}(textit{syst}.)$$ MeV, respectively, which can be naturally interpreted as a theoretically predicted $$K^-pp$$ bound state.

論文

Search for excited state of $$_{Sigma }^{4}{rm He}$$ hypernucleus in the J-PARC E13 experiment

中川 真菜美*; 長谷川 勝一; 早川 修平; 細見 健二; 市川 裕大; 今井 憲一; 佐甲 博之; 佐藤 進; 田村 裕和; 谷田 聖; et al.

JPS Conference Proceedings (Internet), 26, p.023005_1 - 023005_3, 2019/11

The $$Sigma N$$ interaction is not much studied than the $$Lambda N$$ interaction. To understand the $$Sigma N$$ interaction, we study $$Sigma$$ hypernuclei. As for the $$Sigma$$ hypernucleus, only the ground state of $$_{Sigma }^{4}{rm He}$$ has been observed. To obtain more information about the $$Sigma N$$ interaction, the excited state should be studied. Therefore, we measure the missing-mass of the $$^4$$He$$(K^-,pi^-)$$ reaction at $$p_{K^-} = 1.5$$ GeV/$$c$$ and $$theta_{rm Lab} =$$ 2-14$$^{circ}$$ at the J-PARC K1.8 beam line. The ground state of $$_{Sigma }^{4}{rm He}$$ is observed whereas a peak of the excited states is not observed. We also observe suppression of the $$Sigma$$ quasi-free process at smaller angles.

論文

Experimental study of Di-quark correlation by charmed baryon spectroscopy at J-PARC high-momentum secondary beam line

小松 雄哉*; 市川 裕大; 成木 恵*; 谷田 聖; 他24名*

JPS Conference Proceedings (Internet), 26, p.022029_1 - 022029_4, 2019/11

A di-quark correlation has been proposed to describe the internal structure of hadrons, especially those of exotic ones. Nevertheless it lacks a conclusive experimental evidence. The J-PARC E50 experiment performs charmed baryon spectroscopy at J-PARC high-momentum beam line to investigate the role of di-quark correlations in baryons. The energy levels of the excited sates are measured by a missing-mass technique for the first time, and the production rates and decay branching ratios are also measured.

論文

$$Lambda(1405)$$ spectroscopy via the in-flight $$d(K^-, n)$$ reaction at the J-PARC K1.8BR

川崎 新吾*; 橋本 直; 谷田 聖; 他72名*

JPS Conference Proceedings (Internet), 26, p.022009_1 - 022009_5, 2019/11

The spectral shape of the $$Lambda(1405)$$ baryon was measured via the in-flight $$d(K^-, n)$$ reaction at the J-PARC K1.8BR beam-line (J-PARC E31). The second E31 physics run was carried out in January and February, 2018. Approximately $$3.9 times 10^{10}$$ kaons were irradiated on the deuteron target. The missing mass spectrum for the $$d(K^-, n)$$ where the residual final-state particles were $$Sigma^0$$ and $$pi^0$$ ($$d(K^-, n)$$"$$Sigma^0pi^0$$" spectrum) was measured for the first time.

口頭

Kaonic atom experiments at J-PARC

橋本 直

no journal, , 

K中間子原子のX線分光は運動エネルギー0でのK$$^{rm bar}$$N相互作用を研究する強力な実験手法である。我々はJ-PARCの高強度K中間子ビームを用いて、2つのK中間子原子実験を推進している。1つはeVレベルの高いエネルギー分解能を誇る超伝導検出器を用いてK中間子ヘリウム原子2p軌道の強い相互作用シフトを決めることでポテンシャルモデルを区別することを目指す実験である。もう一つは世界初のK中間子重水素X線分光を実現し、K$$^{rm bar}$$相互作用をアイソスピン0,1の成分を分離して決定することを目指す。この講演では、K中間子ヘリウム実験の最新の結果と、K中間子重水素実験に向けた準備状況を発表する。

口頭

J-PARC E07, systematic study of doublestrangeness nuclei with hybrid emulsion method

吉田 純也

no journal, , 

J-PARC E07実験は、ハイブリッドエマルション法を用いてダブルハイパー核を系統的に研究するユニークな実験である。この実験は過去の統計量に対して10倍以上のダブルハイパー核を検出すべく設計された。さらにこの実験はグザイマイナス原子からのX線をゲルマニウム検出器を用い初検出することを狙っている。これらの実験データは、ラムダラムダ間相互作用、グザイ核子間相互作用の研究に本質的な情報をもたらす。この実験のビーム照射は2017年までに完了し、1500枚の写真乾板からなる118モジュールの検出器に情報を蓄積した。写真乾板の現像は完了し、現在は顕微鏡下で解析中である。解析の進捗状況は全体の1割程度で、約10例のダブルハイパー核事象が検出された。本講演では、解析の最新状況:探索作業、個々の事象の解析、展望について報告する。

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