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in a coupled-channel approachL
, Q.-F.*; 永廣 秀子*; 保坂 淳
Physical Review D, 107(1), p.014025_1 - 014025_10, 2023/01
被引用回数：3 パーセンタイル：84.41(Astronomy & Astrophysics)We perform a systematic analysis of the mass and strong decays of the 
(2012) resonance in a coupled -channel approach of a bare three-quark state and a composite meson-baryon state. Besides the coupling of the bare state and 
*
channel, the effective meson-baryon interactions are also included. We find a pole with a mass of 2008 MeV by solving the Bethe-Salpeter equation. The calculated decay widths and its ratios of branching fractions 
/ agree well with the new experimental measurement by the Belle Collaboration. Our results suggest that both three-quark core and * channel are essential for the description of the (2012) resonance. We expect that present calculations can help us to better understand the nature of (2012) resonance.
Arifi, A. J.*; 永廣 秀子*; 保坂 淳; 谷田 聖
Physical Review D, 101(11), p.111502_1 - 111502_5, 2020/06
被引用回数：14 パーセンタイル：70.16(Astronomy & Astrophysics)We study the three-body decay of the newly observed bottom baryon 
by LHCb; 
. Its mass about 500 MeV above the ground state 
and a broad width imply that the state could be an analogue of the Roper resonance of the nucleon 
. In terms of sequential processes going through 
and 
, we find that the observed invariant mass distribution is reproduced assuming its spin and parity 
. We discuss that the ratio of the two sequential processes and angular correlation of two pions are useful for the determination of spin and parity. We suggest further studies for the Roper resonance analogue in various flavor contents, raising an interesting and important question in baryon spectroscopy.
and determination of its spin-parityArifi, A. J.*; 永廣 秀子*; 保坂 淳; 谷田 聖
Physical Review D, 101(9), p.094023_1 - 094023_17, 2020/05
被引用回数：11 パーセンタイル：62.17(Astronomy & Astrophysics)We study three-body decays of 
by using effective Lagrangians in a non-relativistic framework. We consider the sequential decays through 
and 
in intermediate states which are dominant contributions. The coupling constants in the effective Lagrangians are computed in the quark model. We demonstrate that the ratio 
and angular correlations are sensitive to the spin and parity of 
. Thus, the measurement of these observables in experimental facilities such as Belle and LHCb can provide useful constraints to determine the spin and parity of .
永廣 秀子*; 安井 繁宏*; 保坂 淳; 岡 眞; 野海 博之*; 野海 博之*
Physical Review D, 95(1), p.014023_1 - 014023_20, 2017/01
被引用回数：58 パーセンタイル：92.68(Astronomy & Astrophysics)重クォーク対称性を取り入れたクォーク模型による解析に対応したハドロンの内部構造を探索する目的で、チャームバリオンの崩壊過程に注目した。知られている共鳴状態
, 
, 
, 
, 
および
と
がパイオンを1個放出する崩壊幅を計算した。得られた崩壊幅はいずれも実験的に求められているものとよく一致し、さらにいくつかの重要な予言を与える。低い
共鳴の崩壊幅を再現するには、パイオン放出の軸性ベクトル結合が重要であることを指摘した。
共鳴および
共鳴へ崩壊する幅の比が高い共鳴の性質を探索する上で鍵となることを示した
保坂 淳; 肥山 詠美子; Kim, S.-H.*; Kim, H.-C.*; 永廣 秀子*; 野海 博之*; 岡 眞; 白鳥 昂太郎*; 吉田 哲也*; 安井 繁宏*
Nuclear Physics A, 954, p.341 - 351, 2016/10
被引用回数：3 パーセンタイル：26.8(Physics, Nuclear)チャームバリオンの生成反応とその崩壊過程測定に基いて、バリオンの構造や励起モードの特定を行う方法を考察した。生成反応は一段階過程によるバリオン生成に注目し、崩壊はパイオン放出による過程を考えた。J-PARCにおける今後の実験計画においてこれらの過程の測定を目指す。
