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論文

Hadronic Paschen-Back effect in charmonium

岩崎 幸生; 岡 眞; 鈴木 渓*; 吉田 哲也*

AIP Conference Proceedings 2130, p.050001_1 - 050001_8, 2019/07

 被引用回数:0 パーセンタイル:100

ヘビークォークを含むメソンに強い磁場がかかったときにスペクトルおよび波動関数がどのように変化するかを磁場の強さの関数として解析した。

論文

Mesons with charm and strangeness in nuclear matter

Gubler, P.

AIP Conference Proceedings 2130, p.040015_1 - 040015_8, 2019/07

 被引用回数:0 パーセンタイル:100

本講演では最近の発表論文に基づき、核物質におけるチャームクォークやストレンジクォークを含むメソンの振る舞いについての最近の進捗状況について報告する。J-PARCのE16実験などとの関連についても議論する。

論文

Possibility of a new narrow $$Lambda^*$$ resonance near the $$Lambda eta$$ threshold

谷田 聖

AIP Conference Proceedings 2130, p.040019_1 - 040019_6, 2019/07

 被引用回数:0 パーセンタイル:100

Evidence for a narrow $$Lambda^*$$ resonance at a mass of about 1665 MeV (just above the combined mass of the $$Lambda$$ ground state plus the $$eta$$ meson) has been seen in the $$M(pK^-)$$ mass of the Dalitz plot for $$Lambda_c to pK^-pi^+$$ decay at the Belle experiment. Additional evidence for this resonance is found in the partial-wave analysis (PWA) of data on $$K^- p$$ reactions done independently by several groups, driven by angular distributions of the $$K^- p to Lambdaeta$$ reaction by the Crystal Ball collaboration. If a narrow $$Lambda^*$$ resonance exists at this mass, then the conventional quark model cannot explain it, and a possible explanation is that it is a crypto-exotic baryon with a dominant meson-baryon component to its wave function. Therefore we have proposed a definitive experiment for $$K^- p to Lambda eta$$, using the newly built hypTPC detector to establish the existence of the proposed narrow $$Lambda(1665)$$ and determine its spin and parity in just two weeks of beamtime at J-PARC (E72). We will discuss these evidences for the proposed $$Lambda^*$$ resonance and introduce the E72 experiment.

論文

Exotic and conventional quarkonium physics prospects at Belle II

谷田 聖

AIP Conference Proceedings 2130, p.040020_1 - 040020_6, 2019/07

 被引用回数:2 パーセンタイル:4.52

The Belle II experiment, now operating at the KEK laboratory in Japan, is a substantial upgrade of both the Belle detector and the KEKB $$e^+ e^-$$ accelerator. It aims to collect 50 times more data than existing B-Factory samples. Belle II is uniquely capable to study the so-called "XYZ" particles: heavy exotic hadrons consisting of more than three quarks. First discovered by Belle, these now number in the dozens, and represent the emergence of a new category within quantum chromodynamics. This talk will present the capabilities of Belle II to explore both exotic and conventional quarkonium physics.

論文

Gamma-ray spectroscopy of single $$Lambda$$-hypernuclei at J-PARC; Results and perspective

小池 武志*; 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; 杉村 仁志; 田村 裕和; et al.

AIP Conference Proceedings 2130, p.020011_1 - 020011_9, 2019/07

 被引用回数:0 パーセンタイル:100

Experimental results from the J-PARC E13 experiments are summarized. A new experimental set up of E13 has established a platform for the future $$gamma$$-ray hypernuclear spectroscopy at J-PARC using kaon beams. New $$gamma$$ rays are identified in $$^4_{Lambda}$$He and $$^{19}_{Lambda}$$F. The energy of 1.406 MeV for the $$^4_{Lambda}$$He$$(1^+ to 0^+)$$ transition confirmed a sizable effect of Charge Symmetry Breaking (CSB) in $$Lambda N$$ interaction in the $$A=4$$ hypernuclear system. The identification of four $$gamma$$ rays in $$^{19}_{Lambda}$$F is made for the first time in $$sd$$ shell hypernuclei. Especially, energy spacing of the ground state doublet is found to be 315.5 keV. A good agreement with two theoretical calculations suggests that the theoretical formalism used in $$p$$ shell hypernuclei is also applicable to heavier hypernuclei. Lastly, an overview of the future J-PARC E63 experiment is given.

論文

Observation of a $$Xi$$ bound state in the $$^{12}$$C$$(K^-, K^+)$$ reaction at 1.8 GeV/$$c$$

永江 知文*; 江川 弘行; 長谷川 勝一; 早川 修平; 細見 健二; 市川 裕大; 今井 憲一; 金原 慎二; 七村 拓野*; 成木 恵; et al.

AIP Conference Proceedings 2130, p.020015_1 - 020015_9, 2019/07

For the full understanding of baryon-baryon interactions in flavor $$SU(3)$$, the $$Xi N$$ interaction is the last missing piece of information. So far, we have revealed the $$Lambda N$$ interaction to be attractive ($$U_{Lambda} cong 30$$ MeV), and $$Sigma N$$ interaction to be repulsive in the medium to heavy mass-number region. The $$Lambda Lambda$$ bonding energy is weakly attractive. While we have a few experimental observations suggesting the $$Xi N$$ interaction would be attractive, there still exist large theoretical ambiguities weather it is attractive or not. Experimental determinations on the existence of bound states of $$Xi$$ hypernuclei by observing bound-state peaks are strongly awaited. In this report, a new preliminary result on the missing-mass spectrum of a $$^{12}$$C$$(K^-, K^+)$$ reaction, which strongly suggests the existence of $$Xi$$-hypernuclear bound states, is presented.

論文

Spectroscopic study of the $$Lambda$$(1405) resonance via the $$d(K^-, n)$$ reaction at J-PARC

浅野 秀光*; 橋本 直; 谷田 聖; 他72名*

AIP Conference Proceedings 2130, p.040018_1 - 040018_6, 2019/07

 被引用回数:0 パーセンタイル:100

The structure of the $$Lambda(1405)$$ hyperon is an important and long-standing issue related to the $$bar{K}$$-nucleus interaction. The J-PARC E31 experiment has been performed to investigate the $$Lambda(1405)$$ spectrum shape. Because it is hard to form the $$Lambda(1405)$$ directly by a $$bar{K}N$$ scattering in free space, E31 uses the $$d(K^-, n)$$ reaction with an incident kaon momentum of 1 GeV/$$c$$. We will identify three final states - $$Sigma^-pi^+$$, $$Sigma^+pi^-$$, $$Sigma^0pi^0$$ so that the isospin structure of hyperon resonance states produced can be decomposed. The first physics run of the E31 experiment was performed in 2016. To enhance the statistics of the data set, we have performed the second physics run in the beginning of 2018. During the second run of E31, around $$3.9 times 10^{10}$$ kaons impacted on the deuteron target.

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