A Search for ϕ\phi Meson Nucleus Bound State Using Antiproton Annihilation on Nucleus

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12 GeV p + A ハンノウ オ モチイタ ファイ e+ e- オヨビ ファイ K+ K- チャンネル ノ ゲンシカク ブッシツチュウ ニ オケル ホウカイハバ ノ ヘンカ ニ ツイテ ノ ケンキュウ

京都大学0048新制・課程博士博士(理学)甲第13277号理博第3190号新制||理||1473(附属図書館)UT51-2007-H642京都大学大学院理学研究科物理学・宇宙物理学専攻(主査)教授 今井 憲一, 教授 笹尾 登, 准教授 中家 剛学位規則第4条第1項該当Doctor of ScienceKyoto UniversityDA

K - Pp bound system at J-PARC

The K̄NN bound system, symbolically denoted as "K-pp", is the simplest K̄-nuclear bound system which has been widely discussed as a consequence of the strongly attractive K̄N interaction in I = 0 channels. Many theoretical works have pointed out the existence of the "K-pp" bound system, but the calculated properties such as the binding energy and the width spread out due to the uncertainty of the K̄N interaction below the K̄+N mass threshold. Experimentally, there are several reports on observation of a "K-pp" candidate with the binding energy of around 100 MeV, however, no definitive evidence was available so far. At J-PARC, we conducted a experimental search for the "K-pp" bound system using K- + 3He reaction at 1.0 GeV/c where the "K-pp" is expected to be directly produced via the (K-, n) reaction. We finally observed a bound state below the K- +p+p mass threshold in the Λpn final state, which can be interpreted as the "K- pp" bound state. The possible existence of the "K- pp" state is discussed from both aspects of production and decay. © 2020 Author(s)

Search for φ-Meson Nuclear Bound States in the \overlinep + AZ →φ+ A-1φ(Z-1) Reaction

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A Search for ϕ\phi Meson Nucleus Bound State Using Antiproton Annihilation on Nucleus

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Comparison of

Recent heavy-ion collision experiments reported a surprisingly short lifetime for the hypertriton, which has been recognized as the hypertriton lifetime puzzle. Our J-PARC E73 experiment contributes to solve this puzzle with an independent experimental method by employing 3He(K−, π0) 3ΛH reaction. In this contribution, we will demonstrate our capability to provide 3ΛH binding energy information by deriving the production cross section ratio, σ3ΛH/σ4ΛH. The production cross section data for 3ΛH and 4ΛH are already available as the pilot run of E73 experiment and data analysis is in progress