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論文

A Study of the $$phi N$$ correlation function

Abreu, L. M.*; Gubler, P.; Khemchandani, K. P.*; Mart$'i$nez Torres, A.*; 保坂 淳

Physics Letters B, 860, p.139175_1 - 139175_7, 2025/01

https://doi.org/10.1016/j.physletb.2024.139175
 被引用回数：0 パーセンタイル：0.00(Astronomy & Astrophysics)

The femtoscopic $$phi N$$ correlation function is studied within a hadronic effective Lagrangian approach with coupled channels, based on hidden local symmetry. The results are compared with the data recently reported by the ALICE collaboration. We find that the correlation function has very different features for the $$phi N$$ system in the spin 1/2 and 3/2 configurations, with the spin-averaged combination matching well with the experimental data. A strong attraction, leading to the formation of a $$phi N$$ bound state or a very prominent cusp is found in the spin 3/2 case. The correlation function for spin 1/2, on the other hand, is strongly impacted by the negative parity $$N$$*(1895) nucleon resonance.

論文

Investigation on the $$Omega(2012)$$ from QCD sum rules

Su, N.*; Chen, H.-X.*; Gubler, P.; 保坂 淳

Nuclear and Particle Physics Proceedings, 347, p.2 - 5, 2024/12

https://doi.org/10.1016/j.nuclphysbps.2024.09.006

We investigate the recently observed $$Omega(2012)$$ baryon using QCD sum rules. By constructing P-wave $$Omega$$ baryon currents and performing spin projection and parity projection, we obtain the masses of the $$J^P = 1/2^{-}$$ and $$3/2^{-}$$ states as $$M_{1/2^-} = 2.07^{+0.07}_{-0.07}$$ GeV and $$M_{3/2^-} = 2.05^{+0.09}_{-0.10}$$ GeV, in good agreement with experiment. This suggests that $$Omega(2012)$$ is likely to be a negative parity P-wave excited state, though its spin remains undetermined and requires further study of its decay properties.

論文

Likely existence of bound states and the Efimov effect in the triple-$$J/Psi$$ system

Pan, Y.-W.*; Liu, Z.-W.*; Geng, L.-S.*; 保坂 淳; Liu, X.*

Physical Review D, 110(9), p.094004_1 - 094004_8, 2024/11

https://doi.org/10.1103/PhysRevD.110.094004
 被引用回数：0 パーセンタイル：0.00(Astronomy & Astrophysics)

3つの$$J/Psi$$粒子からなる系が浅い束縛状態を作る可能性を指摘した。これはエフィモフ効果が関わっていると解釈される。

論文

Intriguing aspects of light baryon resonances

Khemchandani, K. P.*; Mart$'i$nez Torres, A.*; Kim, S.-H.*; Nam, S.-I.*; 保坂 淳; 永廣 秀子*

EPJ Web of Conferences, 301, p.03001_1 - 03001_10, 2024/08

https://doi.org/10.1051/epjconf/202430103001
 被引用回数：0 パーセンタイル：0.00(Physics, Nuclear)

3個の軽いクォークからなるバリオン共鳴がバレンスクォーク模型で記述できない例について議論する。

論文

Investigation on the $$Omega(2012)$$ from QCD sum rules

Su, N.*; Chen, H.-X.*; Gubler, P.; 保坂 淳

Physical Review D, 110(3), p.034007_1 - 034007_9, 2024/08

https://doi.org/10.1103/PhysRevD.110.034007
 被引用回数：0 パーセンタイル：0.00(Astronomy & Astrophysics)

We study the recently observed $$Omega(2012)$$ baryon in quantum chromodynamics (QCD) sum rules. We construct the P-wave $$Omega$$ baryon currents with a covariant derivative, and perform spin projection to obtain the currents with total spin 1/2 and 3/2. We then apply the parity-projected QCD sum rules to separate the contributions of the positive and negative parity states. We extract the masses of $$J^P = 1/2^{-}$$ and $$3/2^{-}$$ states to be $$M_{1/2^-} = 2.07^{+0.07}_{-0.07}$$ GeV and $$M_{3/2^-} = 2.05^{+0.09}_{-0.10}$$ GeV. Both results are in good agreement with the experimental result. Therefore, it is likely that the $$Omega(2012)$$ is a negative parity state, which is interpreted as a P-wave excited state in the quark model. However, its spin is not determined in the present analysis, which can be done by detailed study on its decay properties.

論文

Production of the $$Xi N$$ dibaryon as a weakly bound system in $$pp$$ collisions

Wu, T.-C.*; 保坂 淳; Geng, L.-S.*

Physical Review D, 109(11), p.114009_1 - 114009_8, 2024/06

https://doi.org/10.1103/PhysRevD.109.114009
 被引用回数：0 パーセンタイル：0.00(Astronomy & Astrophysics)

$$Xi N$$からなるダイバリオンの存在の有無は大きな興味がもたれている。ここでは弱い束縛状態が存在すると仮定し、陽子・陽子衝突によってこのダイバリオンがどの程度生成されるかを見積もった。また、生成量と束縛エネルギーとの普遍的な関係も導いた。

論文

Bottom-charmed baryons in a nonrelativistic quark model

Song, Q.-F.*; L$"u$, Q.-F.*; 保坂 淳

European Physical Journal C, 84(1), p.89_1 - 89_15, 2024/01

https://doi.org/10.1140/epjc/s10052-024-12426-0
 被引用回数：1 パーセンタイル：53.60(Physics, Particles & Fields)

ボトム、チャームクォークを含むバリオンの質量や崩壊巾を非相対論的クォーク模型によって調べた結果を報告する。特に、崩壊様式は3体の波動関数に敏感であることを指摘した。

論文

Fully strange tetraquark states with the exotic quantum numbers $$J^{PC}=0^{+-}$$ and $$2^{+1-}$$

Xi, H.-Z.*; Jiang, Y.-W.*; Chen, H.-X.*; 保坂 淳; Su, N.*

Physical Review D, 108(9), p.094019_1 - 094019_13, 2023/11

https://doi.org/10.1103/PhysRevD.108.094019
 被引用回数：4 パーセンタイル：55.83(Astronomy & Astrophysics)

$$J^{PC}=0^{+-}$$と$$2^{+1-}$$の量子数をもつ、ストレンジクォークのみからなるテトラクォークを理論的に調べた結果を報告する。前者および後者の質量はそれぞれ2.47GeV、3.07GeVであるなど、いくつかの予言値を得た。

論文

Doubly heavy tetraquarks including one-pion exchange potential

Meng, Q.*; 肥山 詠美子*; 岡 眞*; 保坂 淳; Xu, C.*

Physics Letters B, 846, p.138221_1 - 138221_6, 2023/11

https://doi.org/10.1016/j.physletb.2023.138221
 被引用回数：10 パーセンタイル：92.09(Astronomy & Astrophysics)

2個の重いクォークを含んだテトラクォークの質量スペクトルをパイ中間子交換ポテンシャルをとりいれた構成子クォーク模型によって調べた結果を報告する。

論文

Rich structure of the hidden-charm pentaquarks near threshold regions

Giachino, A.*; 保坂 淳; Santopinto, E.*; 竹内 幸子*; 瀧澤 誠*; 山口 康宏*

Physical Review D, 108(7), p.074012_1 - 074012_6, 2023/10

https://doi.org/10.1103/PhysRevD.108.074012
 被引用回数：8 パーセンタイル：73.87(Astronomy & Astrophysics)

$$udscbar{c}$$からなるペンタクォークの構造を分子構造と5クォーク構造の結合チャネル模型によって調べた。その結果、実験で得られた$$P_{cs}$$の質量をよく再現したほか、敷値近傍に他の粒子が存在することを予言した。

論文

Axial anomaly effect on three-quark and five-quark singly heavy baryons

高田 寛大*; 末永 大輝*; 原田 正康*; 保坂 淳; 岡 眞*

Physical Review D, 108(5), p.054033_1 - 054033_15, 2023/09

https://doi.org/10.1103/PhysRevD.108.054033
 被引用回数：3 パーセンタイル：34.85(Astronomy & Astrophysics)

$$U(1)_A$$アノマリーが重いバリオンの1重項の質量に与える影響をカイラル有効理論によって調べた結果を報告する。

論文

Understanding the nature of $$Omega(2012)$$ in a coupled-channel approach

L$"u$, Q.-F.*; 永廣 秀子*; 保坂 淳

Physical Review D, 107(1), p.014025_1 - 014025_10, 2023/01

https://doi.org/10.1103/PhysRevD.107.014025
 被引用回数：7 パーセンタイル：73.87(Astronomy & Astrophysics)

We perform a systematic analysis of the mass and strong decays of the $$Omega$$(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 $$Xi$$*$$overline{K}$$ 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 $$R$$ $$Xi$$$$pi$$$$overline{K}$$/$$Xi$$$$overline{K}$$ agree well with the new experimental measurement by the Belle Collaboration. Our results suggest that both three-quark core and $$Xi$$*$$overline{K}$$ channel are essential for the description of the $$Omega$$(2012) resonance. We expect that present calculations can help us to better understand the nature of $$Omega$$(2012) resonance.

論文

Open charm and bottom meson-nucleon potentials $`a$ la the nuclear force

山口 康宏; 安井 繁宏*; 保坂 淳

Physical Review D, 106(9), p.094001_1 - 094001_16, 2022/11

https://doi.org/10.1103/PhysRevD.106.094001
 被引用回数：2 パーセンタイル：21.84(Astronomy & Astrophysics)

We discuss the interaction of an open heavy meson ($$overline{D}$$ and $$overline{D}$$* for charm or $$B$$ and $$B$$* for bottom) and a nucleon ($$N$$) by considering the $$pi$$, $$sigma$$, $$rho$$, and $$omega$$ exchange potentials. We construct a potential model by respecting chiral symmetry for light quarks and spin symmetry for heavy quarks. Model parameters are adjusted by referring the phenomenological nuclear (CD-Bonn) potentials reproducing the low-energy $$NN$$ scatterings. We show that the resulting interaction may accommodate $$overline{D}N$$ and $$BN$$ bound states with quantum numbers $$I(J^{P})$$ = 0(1/2$$^{-}$$), and 1(1/2$$^{-}$$). We find that, in the present potential model, the $$pi$$ exchange potential plays an important role for the isosinglet channel, while the $$sigma$$ exchange potential does for the isotriplet one.

論文

Exotic properties of $$N^*(1895)$$ and its impact on photoproduction of light hyperons

Khemchandani, K. P.*; Mart$'i$nez Torres, A.*; Kim, S.-H.*; Nam, S.-I.*; 保坂 淳

Acta Physica Polonica A, 142(3), p.329 - 336, 2022/09

https://doi.org/10.12693/APhysPolA.142.329
 被引用回数：2 パーセンタイル：30.07(Physics, Multidisciplinary)

In this work, we outline the findings of our recent study of the properties of $$N^*(1895)$$ and its consequential impacts on the cross-sections of the photoproduction of $$Lambda$$(1405). Further, we discuss the possibility of the existence of an isovector state with a mass similar to $$Lambda$$(1405), which we refer to as $$Sigma$$(1400). With the idea of motivating experimental investigations of $$Sigma$$(1400), we have studied its photo-production process and determined the respective cross-sections and polarization observables. We have studied also the coupling of $$N^*(1895)$$ to $$K$$$$Sigma$$(1400) and found that it gives an important contribution to the cross-sections near the threshold. In the process, we have determined the branching ratios of the decay of $$N^*(1895)$$ to the final states involving $$Lambda$$(1405) and $$Sigma$$(1400) to be in the range of 6-7 MeV. Our findings can motivate the consideration of alternative processes in partial wave analyses of experimental data when studying the properties of $$N^*(1895)$$.

論文

Electromagnetic transition amplitude for Roper resonance from holographic QCD

藤井 大輔; 岩中 章紘*; 保坂 淳*

Physical Review D, 106(1), p.014010_1 - 014010_6, 2022/07

https://doi.org/10.1103/PhysRevD.106.014010
 被引用回数：4 パーセンタイル：39.68(Astronomy & Astrophysics)

核子の第一励起状態であるローパー共鳴は、最もよく確立されたバリオン共鳴の一つである。しかし、その性質は非相対論的クォーク模型のようなQCDの有効模型では一貫して説明できていない。本論文では、QCDのホログラフィック模型の一つである酒井・杉本模型における別のアプローチを提案する。本論文では、QCDのホログラフィック模型の一つである・酒井杉本模型において、特に、't Hooft結合$$1/lambda$$のleadingにおける電磁遷移のヘリシティ振幅を解析する。このモデルは、長距離のメソンクラウドに囲まれた、近距離の非線形メソン場によってバリオンを取り扱う。CLASで最近観測されたデータがこのアプローチで説明できることを示す。

論文

Decay properties of $$N$$(1535) in the holographic QCD

岩中 章紘*; 藤井 大輔*; 保坂 淳

Physical Review D, 105(11), p.114057_1 - 114057_6, 2022/06

https://doi.org/10.1103/PhysRevD.105.114057
 被引用回数：4 パーセンタイル：39.68(Astronomy & Astrophysics)

核子の第一励起状態である$$N$$(1535)のパイ中間子放出崩壊をホログラフィックQCDによって調べた。軸性結合定数の解析的表式を得て、その崩壊に対する巾として約30MeVを得た。これは実験データよりも小さいもののそれほど離れていない値である。

論文

Strong decays of multistrangeness baryon resonances in the quark model

Arifi, A. J.*; 末永 大輝*; 保坂 淳; Oh, Y. S.*

Physical Review D, 105(9), p.094006_1 - 094006_17, 2022/05

https://doi.org/10.1103/PhysRevD.105.094006
 被引用回数：16 パーセンタイル：83.52(Astronomy & Astrophysics)

Decay properties of multistrangeness $$Xi$$ and $$Omega$$ baryon resonances are investigated within the constituent quark model by including relativistic corrections. The strong decay widths of various $$Xi$$ and $$Omega$$ resonances are computed and tested for internal quark configurations to pin down their spin-parity ($$J$$$$^{P}$$) quantum numbers and internal structures. We found that the Roper-like resonances in the multistrangeness sector have large decay widths bearing resemblances to their siblings in light and heavy baryon sectors. In addition, we obtained the decay ratio for the $$Omega$$(2012) as $$Gamma$$($$Omega$$ $$rightarrow$$ $$Xi$$$$overline{K}$$$$pi$$)/$$Gamma$$($$Omega$$ $$rightarrow$$ $$Xi$$$$overline{K}$$) = 4.5%, which is consistent with the experimental data when $$J$$$$^{P}$$ = 3/2$$^{-}$$ is assigned. This observation holds the possibility that the $$Omega$$(2012) could naturally be explained as a three-quark state in the quark model. The decays of other low-lying $$Xi$$ and $$Omega$$ resonances are systematically analyzed, which would be useful to unveil the structure of these resonances in future experiments.

論文

Decays of Roper-like singly heavy baryons in a chiral model

末永 大輝*; 保坂 淳

Physical Review D, 105(7), p.074036_1 - 074036_13, 2022/04

https://doi.org/10.1103/PhysRevD.105.074036
 被引用回数：9 パーセンタイル：62.02(Astronomy & Astrophysics)

We present a chiral model describing decays of the Roper-like $$Lambda$$$$_{c}$$(2765) and $$Xi$$$$_{c}$$(2970) as well as those of the heavy quark spin-doublet ${ $Sigma$$_{c}$(2455), $Sigma$$_{c}$(2520)}$ and ${ $Xi$$_{c}$', $Xi$$_{c}$(2645)}$, by focusing on chiral representations of diquarks inside the heavy baryons. Based on our chiral model together with the heavy quark spin symmetry, we derive a relation satisfied by axial charges of the heavy baryons that controls the magnitude of their one pion (kaon) decays. Besides, it is shown that the large decay widths of the Roperlike $$Lambda$$$$_{c}$$(2765) and $$Xi$$$$_{c}$$(2970), which cannot be implemented by conventional nonrelativistic quark models, are explained by reasonable values of the axial charges. In addition, we apply the chiral model to bottom baryons and predict decay widths of the undiscovered Roper-like $$Xi$$$$_{b}$$. We expect that our present investigation leads to elucidation of dynamical properties of the excited heavy baryons from the viewpoint of chiral symmetry.

論文

Charmed baryon pair production in proton-antiproton collisions in effective Lagrangian and Regge approaches

Sangkhakrit, T.*; Shim, S.-I.*; Yan, Y.*; 保坂 淳

European Physical Journal A, 58(2), p.32_1 - 32_11, 2022/02

https://doi.org/10.1140/epja/s10050-022-00678-x
 被引用回数：3 パーセンタイル：46.68(Physics, Nuclear)

Strange and charmed baryon pair productions in proton-antiproton collisions are studied in the effective Lagrangian and Regge approaches. Unknown parameters of both models are determined from the comparison with the existing data for strangeness productions. Then, we predict charm production cross sections by extrapolating the amplitudes for strangeness productions to those for charm. As a result, the total cross sections are about 10$$^{-4}$$ to 10$$^{-5}$$ times smaller than those of strangeness productions, depending on the final states. By using the known total cross sections for strangeness, similar to 10$$^{2}$$ $$mu$$b for $$Lambda$$ $$overline{Lambda}$$ and, similar to 10$$^{1}$$ $$mu$$b for $$Sigma$$ $$overline{Lambda}$$, the total cross sections for charm productions are predicted to be similar to 10$$^{-2}$$ $$mu$$b for $$Lambda$$$$_{c}$$ $$overline{Lambda}$$$$_{c}$$, similar to 10$$^{-3}$$ $$mu$$b for $$Sigma$$$$_{c}$$ $$overline{Lambda}$$$$_{c}$$, and similar to 10$$^{-4}$$ $$mu$$b for $$Sigma$$$$_{c}$$ $$overline{Sigma}$$$$_{c}$$. Our results can be tested in the future experiments at $$overline{rm P}$$ANDA.

論文

Doubly heavy tetraquark resonant states

Meng, Q.*; 原田 正康*; 肥山 詠美子; 保坂 淳; 岡 眞

Physics Letters B, 824, p.136800_1 - 136800_5, 2022/01

https://doi.org/10.1016/j.physletb.2021.136800
 被引用回数：27 パーセンタイル：97.16(Astronomy & Astrophysics)

ダブルヘビーテトラクォークのスペクトルを計算した。

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