Few-Body Systems最新文献_第2页

Consistency of Dalgarno–Lewis perturbation theory for confining two-body systems: second-order corrections in the Cornell potential 限制二体系统的Dalgarno-Lewis微扰理论的一致性：Cornell势的二阶修正

IF 1.8 4区物理与天体物理

Few-Body Systems Pub Date : 2026-04-05 DOI: 10.1007/s00601-026-02041-y

Krishna Kingkar Pathak

{"title":"Consistency of Dalgarno–Lewis perturbation theory for confining two-body systems: second-order corrections in the Cornell potential","authors":"Krishna Kingkar Pathak","doi":"10.1007/s00601-026-02041-y","DOIUrl":"10.1007/s00601-026-02041-y","url":null,"abstract":"<div>Confining two-body systems provide a useful setting for examining the internal consistency of perturbative treatments of bound-state wavefunctions. In this work, we investigate the applicability of Dalgarno–Lewis perturbation theory beyond first order within a nonrelativistic Cornell-type potential, ( V(r)=br-tfrac{4alpha _s}{3r}+c ), treating the linear confinement term as the parent Hamiltonian and incorporating the Coulombic interaction perturbatively so as to retain analytic control over the solutions. Going beyond standard first-order implementations, we carry out a systematic second-order Dalgarno–Lewis correction to the Airy-function ground state and analyze its impact on wavefunction moments. We show that while lower spatial moments are only mildly affected at first order, observables involving higher spatial moments are not fully stabilized at first order at the sub-percent level, indicating that first-order Dalgarno–Lewis theory does not by itself guarantee quantitative control of such quantities in confining two-body systems. Inclusion of second-order contributions is therefore necessary to ensure controlled perturbative accuracy and restore quantitative stability. As an explicit application, we evaluate effective overlap functions, their slopes and curvatures, as well as geometric and electromagnetic radii for representative heavy–light mesons (D, (D_s), B, and (B_s)). While the analysis is model dependent and is carried out within a nonrelativistic potential-model framework and does not rely on strict heavy-quark universality, the resulting magnitudes and systematic trends are compatible with those obtained in relativistic quark models, QCD sum-rule approaches, and continuum Dyson–Schwinger/Bethe–Salpeter studies. The present results provide semi-analytic benchmarks that clarify the role of higher-order wavefunction corrections in few-body bound-state problems.</div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"67 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147642676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Decoding (T_{cc}(3875)^+): A Deep Learning Approach to the Pole Structure Via the Uniformized (mathcal {S})-Matrix 解码(T_{cc}(3875)^+)：通过统一(mathcal {S}) -矩阵的极点结构的深度学习方法

IF 1.8 4区物理与天体物理

Few-Body Systems Pub Date : 2026-04-03 DOI: 10.1007/s00601-026-02039-6

Julius B. Pagayon, Denny Lane B. Sombillo

引用次数: 0

Three-Nucleon Force Effects in the Proton-Deuteron Breakup Reaction 质子-氘核分裂反应中的三核子力效应

IF 1.8 4区物理与天体物理

Few-Body Systems Pub Date : 2026-04-02 DOI: 10.1007/s00601-026-02040-z

Souichi Ishikawa

引用次数: 0

From Three-Body Resonances to Bound States in a Continuum: Pole Trajectories 从三体共振到连续体中的束缚态：极点轨迹

IF 1.8 4区物理与天体物理

Few-Body Systems Pub Date : 2026-03-30 DOI: 10.1007/s00601-026-02034-x

Lucas Happ

引用次数: 0

Hadron Physics Opportunities at FAIR with Proton and Pion Beams 质子和介子束在FAIR上的强子物理机会

IF 1.8 4区物理与天体物理

Few-Body Systems Pub Date : 2026-03-19 DOI: 10.1007/s00601-026-02035-w

Jenny Taylor

{"title":"Hadron Physics Opportunities at FAIR with Proton and Pion Beams","authors":"Jenny Taylor","doi":"10.1007/s00601-026-02035-w","DOIUrl":"10.1007/s00601-026-02035-w","url":null,"abstract":"<div>The Facility for Antiproton and Ion Research (FAIR) is a nuclear physics facility currently under construction at GSI in Germany, aimed at advancing fundamental research. FAIR will enable novel studies of matter under extreme conditions, replicating the environments found in neutron stars and their mergers. In addition, one of FAIR’s scientific missions is to explore the exotic landscape and the properties of nuclei containing strangeness, i.e. hypernuclei. Connected to this, FAIR offers opportunities for hadron physics research, enabling the study of strongly interacting matter in the field of non-perturbative QCD using, in particular, high-intensity proton and pion beams. Integrating hadron, heavy-ion, and nuclear physics in one facility allows to probe matter from multiple angles with shared and versatile detector systems. This proceeding outlines the capabilities of FAIR for fundamental hadron physics research, presenting both the infrastructure and key highlights of the physics program. An overview of studies aimed at understanding e.g. baryon interactions is given and preliminary results from ongoing feasibility studies are presented.</div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"67 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00601-026-02035-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147560264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Phenomenological Models Prediction to Study the (p_T) Spectra of Identified Hadrons in Au+Au Collisions at (sqrt{s}=7.7) GeV (sqrt{s}=7.7) GeV中Au+Au碰撞中已识别强子(p_T)谱的现象学模型预测

IF 1.8 4区物理与天体物理

Few-Body Systems Pub Date : 2026-03-18 DOI: 10.1007/s00601-026-02029-8

Maryam Waqar, Haifa I. Alrebdi, Muhammad Ajaz, Muhammad Waqas, Mohammad Ayaz Ahmad, Refka Ghodhbani

{"title":"The Phenomenological Models Prediction to Study the (p_T) Spectra of Identified Hadrons in Au+Au Collisions at (sqrt{s}=7.7) GeV","authors":"Maryam Waqar, Haifa I. Alrebdi, Muhammad Ajaz, Muhammad Waqas, Mohammad Ayaz Ahmad, Refka Ghodhbani","doi":"10.1007/s00601-026-02029-8","DOIUrl":"10.1007/s00601-026-02029-8","url":null,"abstract":"<div>This work compares identified-hadron (p_T) spectra in Au+Au collisions at (sqrt{s}=7.7) GeV, measured by the STAR experiment at RHIC, with results from common event generators. We use EPOS (EPOSLHC and EPOS4) and Pythia8 and confront them directly with the data. The study covers (pi ^pm ), (K^pm ), and protons-antiprotons at mid-rapidity ((|y|<0.1)) in nine centrality bins.Pythia8 tends to overestimate pion data and misrepresents kaons and (anti-)protons depending on centrality. EPOS4 described the pions spectra well in comparison with Pythia8 consistent with the inclusion of hadronic re-scattering in the model. EPOSLHC aligns with experimental data better at higher (p_T) for pions and anti-protons but underestimates kaons and protons in most centrality bins. At larger (p_T), suppression is observed in EPOSLHC tune which may reflect the collective flow that affects high (p_T) particles. The EPOS4 model generally matches data well across centrality bins for (pi ^pm ), (K^pm ) mesons, and anti-protons, but its accuracy diminishes in peripheral collisions, particularly underestimating protons at high (p_T) consistent with weaker final-state interaction effects in smaller systems. Additionally, suppression is observed in EPOS4 in protons and anti-protons, which may be influenced by baryon–anti-baryon annihilation channels implemented in the model. In general, EPOS4 and EPOSLHC provide a closer description than Pythia8 in the measured range, consistent with their inclusion of collective dynamics and hadronic re-scattering. Additionally, the extracted freeze-out parameters show that effective temperature rises and the non-extensive parameter decreases with increasing centrality, indicating greater system excitation and faster thermal equilibration in central collisions.</div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"67 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147559968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Application of the Calculable R-matrix to Study the (^{12,13})C(p,(gamma ))(^{13,14})N Reaction 应用可计算r矩阵研究(^{12,13}) C(p, (gamma )) (^{13,14}) N反应

IF 1.8 4区物理与天体物理

Few-Body Systems Pub Date : 2026-03-17 DOI: 10.1007/s00601-026-02031-0

Nguyen Hoang Phuc, Nguyen Tri Toan Phuc, Do Cong Cuong

引用次数: 0

Mutual Correlations of Pairing Correlations, Spin–Orbit Interaction, and Deformation Effects for the Ground State of (^{12}hbox {C}) 对相关的相互关联，自旋-轨道相互作用，以及基态的变形效应 (^{12}hbox {C})

IF 1.8 4区物理与天体物理

Few-Body Systems Pub Date : 2026-03-16 DOI: 10.1007/s00601-026-02036-9

Eunja Ha, Myung-Ki Cheoun, H. Sagawa, G. Colò

{"title":"Mutual Correlations of Pairing Correlations, Spin–Orbit Interaction, and Deformation Effects for the Ground State of (^{12}hbox {C})","authors":"Eunja Ha, Myung-Ki Cheoun, H. Sagawa, G. Colò","doi":"10.1007/s00601-026-02036-9","DOIUrl":"10.1007/s00601-026-02036-9","url":null,"abstract":"<div>The intrinsic structure of (^{12}hbox {C}) remains a longstanding challenge in self-consistent mean-field approaches, as different density functional theory calculations predict either spherical or deformed ground-state configurations. In this work, we investigate the interplay between the spin–orbit interaction, pairing correlations, and quadrupole deformation in (^{12}hbox {C}) within the Skyrme–Hartree–Fock–Bogoliubov framework. By systematically varying the strengths of the spin–orbit interaction and the pairing interaction, we analyze the evolution of potential energy curves, single-particle shell structure, and occupation probabilities. For the normal spin–orbit strength, the spherical configuration remains remarkably robust against variations in the pairing strength. When the spin–orbit interaction is reduced, the shell structure around the Fermi surface becomes softened, allowing pairing correlations to play a decisive role in stabilizing an oblate intrinsic shape. These results demonstrate that, in (^{12}hbox {C}), the spin–orbit interaction controls the onset of deformation, whereas pairing correlations determine whether deformation is realized. It means that Gamow–Teller transition strengths might be highly sensitive to these structural changes and thus provide a valuable probe of the underlying intrinsic configuration.</div>","PeriodicalId":556,"journal":{"name":"Few-Body Systems","volume":"67 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2026-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147559279","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

THE DUNKL-SCHRÖDINGER EQUATION ON THE TORUS: SOLVABLE CASES AND BOUND STATES 环面上的dunkl-schrÖdinger方程：可解情况和束缚态

IF 1.8 4区物理与天体物理

Few-Body Systems Pub Date : 2026-03-14 DOI: 10.1007/s00601-026-02037-8

Axel Schulze-Halberg

引用次数: 0

Jost Function for the Description of Resonance in Finite Quantum Multichannel Systems 描述有限量子多通道系统共振的Jost函数

IF 1.8 4区物理与天体物理

Few-Body Systems Pub Date : 2026-03-10 DOI: 10.1007/s00601-026-02032-z

Kazuhito Mizuyama

引用次数: 0