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Mean-field approximation on steroids: exact description of the deuteron 类固醇的平均场近似：氘核的精确描述
IF 2.8 3区 物理与天体物理
The European Physical Journal A Pub Date : 2025-06-18 DOI: 10.1140/epja/s10050-025-01596-4
B. Bally, A. Scalesi, V. Somà, L. Zurek, T. Duguet
{"title":"Mean-field approximation on steroids: exact description of the deuteron","authors":"B. Bally,&nbsp;A. Scalesi,&nbsp;V. Somà,&nbsp;L. Zurek,&nbsp;T. Duguet","doi":"10.1140/epja/s10050-025-01596-4","DOIUrl":"10.1140/epja/s10050-025-01596-4","url":null,"abstract":"<div><p>The present article demonstrates that the deuteron, i.e. the lightest bound nuclear system made of a single proton and a single neutron, can be accurately described within a mean-field-based framework. Although paradoxical at first glance, the deuteron ground-state binding energy, magnetic dipole moment, electric quadrupole moment and root-mean-square proton radius are indeed reproduced with sub-percent accuracy via a low-dimensional linear combination of non-orthogonal Bogoliubov states, i.e. with a method whose numerical cost scales as <span>(n_{text {dim}}^4)</span>, where <span>(n_{text {dim}})</span> is the dimension of the basis of the one-body Hilbert space. By further putting the system into a harmonic trap, the neutron-proton scattering length and effective range in the <span>( ^{3}S_1)</span> channel are also accurately reproduced. To achieve this task, (i) the inclusion of proton-neutron pairing through the mixing of proton and neutron single-particle states in the Bogoliubov transformation and (ii) the restoration of proton and neutron numbers before variation are shown to be mandatory ingredients. This unexpected result has implications regarding the most efficient way to capture necessary correlations as a function of nuclear mass and regarding the possibility to ensure order-by-order renormalizability of many-body calculations based on chiral or pionless effective field theories beyond light nuclei. In this context, the present study will be extended to <span>(^{3})</span>H and <span>(^{3,4})</span>He in the near future as well as to the leading order of pionless effective field theory.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145166418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Mapped interacting boson model for nuclear structure studies 核结构研究的映射相互作用玻色子模型
IF 2.8 3区 物理与天体物理
The European Physical Journal A Pub Date : 2025-06-17 DOI: 10.1140/epja/s10050-025-01604-7
Kosuke Nomura
{"title":"Mapped interacting boson model for nuclear structure studies","authors":"Kosuke Nomura","doi":"10.1140/epja/s10050-025-01604-7","DOIUrl":"10.1140/epja/s10050-025-01604-7","url":null,"abstract":"<div><p>The present status of the mapped interacting boson model studies on nuclear structure is reviewed. With the assumption that the nuclear surface deformation induced by the multi-nucleon dynamics is simulated by bosonic degrees of freedom, the interacting-boson Hamiltonian that provides energy spectra and wave functions is determined by mapping the potential energy surface that is obtained from self-consistent mean-field calculations based on the energy density functional onto the corresponding energy surface of the boson system. This procedure has been shown to be valid in general cases of the quadrupole collective states, and has allowed for systematic studies on spectroscopic properties of medium-heavy and heavy nuclei, including those that are far from the line of <span>(beta )</span> stability. The method has been extended to study nuclear structure phenomena that include shape phase transitions and coexistence, octupole deformation and collectivity, and the coupling of the single-particle to collective degrees of freedom, which is crucial to describe structures of odd nuclei, and <span>(beta )</span> and <span>(beta beta )</span> decays.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145166999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Two-center harmonic oscillator basis for Skyrme-DFT calculations (I): formalism and Proof of Principle Skyrme-DFT计算的双中心谐振子基（一）：形式主义和原理证明
IF 2.8 3区 物理与天体物理
The European Physical Journal A Pub Date : 2025-06-17 DOI: 10.1140/epja/s10050-025-01605-6
Adrián Sánchez-Fernández, Jacek Dobaczewski, Xuwei Sun, Herlik Wibowo
{"title":"Two-center harmonic oscillator basis for Skyrme-DFT calculations (I): formalism and Proof of Principle","authors":"Adrián Sánchez-Fernández,&nbsp;Jacek Dobaczewski,&nbsp;Xuwei Sun,&nbsp;Herlik Wibowo","doi":"10.1140/epja/s10050-025-01605-6","DOIUrl":"10.1140/epja/s10050-025-01605-6","url":null,"abstract":"<div><p>We present a new method to solve the nuclear density functional theory (DFT) equations using a two-center harmonic oscillator for Skyrme-like functionals, incorporating pairing and Coulomb interactions. The goal is to efficiently determine the fission and fusion configurations in nuclei. The Coulomb exchange term is evaluated exactly, allowing for a novel approach to neck formation without the Slater approximation, commonly used in space coordinate-based approaches. The new method has been implemented in the code <span>hfodd</span>, enabling direct comparison with standard one-center solutions. This first paper focuses on deriving and implementing a methodology based on stable, precise, and exact applications of harmonic oscillator bases for the two fragments, which can either overlap or be separated by arbitrarily large distances. The implementation is tested on two proof-of-principle examples using light nuclei, specifically, <span>(^8)</span>Be and <span>(^{24})</span>Mg.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145166083","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Bottomonium meson spectrum with quenched and unquenched quark models 具有淬灭和未淬灭夸克模型的底onium介子谱
IF 2.8 3区 物理与天体物理
The European Physical Journal A Pub Date : 2025-06-17 DOI: 10.1140/epja/s10050-025-01607-4
M. Atif Sultan, Wei Hao, E. S. Swanson, Lei Chang
{"title":"Bottomonium meson spectrum with quenched and unquenched quark models","authors":"M. Atif Sultan,&nbsp;Wei Hao,&nbsp;E. S. Swanson,&nbsp;Lei Chang","doi":"10.1140/epja/s10050-025-01607-4","DOIUrl":"10.1140/epja/s10050-025-01607-4","url":null,"abstract":"<div><p>An open question in hadronic phenomenology concerns the “unquenching” effects of higher Fock space components on the leading Fock space description of hadrons. We address this by making a comparison of the bottomonium spectrum as computed with the relativized Godfrey–Isgur quark model and an unquenched coupled channel model driven by the “<span>(^3P_0)</span>” mechanism of hadronic decay. Our results show that both models can describe the spectrum well, indicating that the influence of coupled channel effects can be largely absorbed into the parameters of the quenched quark model. This conclusion is reinforced by a perturbative calculation that shows that the spin-dependence of mass splittings due to mixing with the continuum recapitulates quenched quark model spin-dependent interactions. We also show that softening of the quark-antiquark wavefunction due to continuum mixing improves the description of vector bottomonium decay constants. Together, these results illustrate and substantiate the surprising robustness of simple constituent quark model descriptions of hadrons.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145166084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 baryon–baryon interaction in the large-(N_c) limit 大N - c极限下重子-重子相互作用。
IF 2.8 3区 物理与天体物理
The European Physical Journal A Pub Date : 2025-06-16 DOI: 10.1140/epja/s10050-025-01602-9
Thomas Vonk, Ulf-G. Meißner
{"title":"The baryon–baryon interaction in the large-(N_c) limit","authors":"Thomas Vonk,&nbsp;Ulf-G. Meißner","doi":"10.1140/epja/s10050-025-01602-9","DOIUrl":"10.1140/epja/s10050-025-01602-9","url":null,"abstract":"<div><p>We analyze the large-<span>(N_c)</span> structure of the baryon–baryon potential derived in the framework of SU(3) chiral perturbation theory up to next-to-leading order including contact interactions as well as one-meson and two-meson exchange diagrams. Moreover, we assess the impact of SU(3) symmetry breaking from a large-<span>(N_c)</span> perspective and show that the leading order results can successfully be applied to the hyperon–nucleon potential. Our results include a reduction of the number of relevant low-energy constants of the leading order contact interaction from fifteen to three, and we show that consistency is preserved if the <i>F</i>/<i>D</i> ratio is given by 2/3 and the <i>C</i>/<i>D</i> ratio for the baryon decuplet-to-octet coupling is given by 2.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12170797/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144328044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Study of nuclear structure in 122Ba from DCO Ratio and Polarization measurements 用DCO比和极化测量研究122Ba的核结构
IF 2.8 3区 物理与天体物理
The European Physical Journal A Pub Date : 2025-06-16 DOI: 10.1140/epja/s10050-025-01591-9
Bharti Rohila, Ashok Kumar,  Diwanshu, Chetan Sharma,  Amit,  Subodh, H. Arora, Mehak Narula, Nabeel Salim, P. Arumugam, Mohammad Anser, H. P. Sharma, Anand Pandey, S. K. Chamoli, Kaushik Katre,  Yashraj, R. P. Singh, S. Muralithar
{"title":"Study of nuclear structure in 122Ba from DCO Ratio and Polarization measurements","authors":"Bharti Rohila,&nbsp;Ashok Kumar,&nbsp; Diwanshu,&nbsp;Chetan Sharma,&nbsp; Amit,&nbsp; Subodh,&nbsp;H. Arora,&nbsp;Mehak Narula,&nbsp;Nabeel Salim,&nbsp;P. Arumugam,&nbsp;Mohammad Anser,&nbsp;H. P. Sharma,&nbsp;Anand Pandey,&nbsp;S. K. Chamoli,&nbsp;Kaushik Katre,&nbsp; Yashraj,&nbsp;R. P. Singh,&nbsp;S. Muralithar","doi":"10.1140/epja/s10050-025-01591-9","DOIUrl":"10.1140/epja/s10050-025-01591-9","url":null,"abstract":"<div><p>High-spin states in <sup>122</sup>Ba have been investigated in the <sup>93</sup>Nb(<sup>32</sup>S, p2n) reaction by in-beam <span>(gamma )</span>-ray spectroscopy. Spin and parity have been determined for few bands using the DCO ratio and polarization measurements. The cranked shell model calculations have been performed to reproduce the band crossing frequencies and alignment gain in order to assign the configuration.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145166673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Role of clustered nuclear geometry in particle production through p–C and p–O collisions at the Large Hadron Collider 聚簇核几何在大型强子对撞机p-C和p-O碰撞产生粒子中的作用
IF 2.8 3区 物理与天体物理
The European Physical Journal A Pub Date : 2025-06-14 DOI: 10.1140/epja/s10050-025-01608-3
Aswathy Menon Kavumpadikkal Radhakrishnan, Suraj Prasad, Neelkamal Mallick, Raghunath Sahoo
{"title":"Role of clustered nuclear geometry in particle production through p–C and p–O collisions at the Large Hadron Collider","authors":"Aswathy Menon Kavumpadikkal Radhakrishnan,&nbsp;Suraj Prasad,&nbsp;Neelkamal Mallick,&nbsp;Raghunath Sahoo","doi":"10.1140/epja/s10050-025-01608-3","DOIUrl":"10.1140/epja/s10050-025-01608-3","url":null,"abstract":"<div><p>Long-range multi-particle correlations in heavy-ion collisions have shown conclusive evidence of the hydrodynamic behavior of strongly interacting matter and are associated with the final-state azimuthal momentum anisotropy. In small collision systems, azimuthal anisotropy can be influenced by the hadronization mechanism and residual jet-like correlations. Thus, one of the motives of the planned p–O and O–O collisions at the LHC and RHIC is to understand the origin of small system collectivity. As the anisotropic flow coefficients (<span>(v_n)</span>) are sensitive to the initial-state effects including nuclear shape, deformation, and charge density profiles, studies involving <span>(^{12})</span>C and <span>(^{16})</span>O nuclei are transpiring due to the presence of exotic <span>(alpha )</span> (<span>(^{4})</span>He) clusters in such nuclei. In this study, for the first time, we investigate the effects of nuclear <span>(alpha )</span>–clusters on the azimuthal anisotropy of the final-state hadrons in p–C and p–O collisions at <span>(sqrt{s_textrm{NN}}= 9.9)</span> TeV within a multi-phase transport model framework. We report the transverse momentum (<span>(p_textrm{T})</span>) and pseudorapidity (<span>(eta )</span>) spectra, participant eccentricity (<span>(epsilon _2)</span>) and triangularity (<span>(epsilon _3)</span>), and estimate the elliptic flow (<span>(v_2)</span>) and triangular flow (<span>(v_3)</span>) of the final-state hadrons using the two-particle cumulant method. These results are compared with a model-independent Sum of Gaussians (SOG) type nuclear density profile for <span>(^{12})</span>C and <span>(^{16})</span>O nuclei.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145165980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
New measurements of (p,xp) and (p,x(alpha )) reactions on ( ^{27})Al at 7.0, 22.0 and 30.0 MeV （p,xp）和（p,x (alpha )）反应在7.0,22.0和30.0 MeV下在( ^{27}) Al上的新测量
IF 2.8 3区 物理与天体物理
The European Physical Journal A Pub Date : 2025-06-12 DOI: 10.1140/epja/s10050-025-01603-8
D. Gusseinova, G. Ussabayeva, T. K. Zholdybayev, I. Boztosun, Y. Kucuk, A. J. Koning, Zh. Kerimkulov, B. Sadykov, A. Temirzhanov, B. Canbula
{"title":"New measurements of (p,xp) and (p,x(alpha )) reactions on ( ^{27})Al at 7.0, 22.0 and 30.0 MeV","authors":"D. Gusseinova,&nbsp;G. Ussabayeva,&nbsp;T. K. Zholdybayev,&nbsp;I. Boztosun,&nbsp;Y. Kucuk,&nbsp;A. J. Koning,&nbsp;Zh. Kerimkulov,&nbsp;B. Sadykov,&nbsp;A. Temirzhanov,&nbsp;B. Canbula","doi":"10.1140/epja/s10050-025-01603-8","DOIUrl":"10.1140/epja/s10050-025-01603-8","url":null,"abstract":"<div><p>We present new experimental data for the inclusive (p,xp) and (p,x<span>(alpha )</span>) reactions on <span>( ^{27})</span>Al target. Double-differential cross sections of (p,xp) at energies 7, 22, 30 MeV and (p,x<span>(alpha )</span>) at energies 22, 30 MeV within the angular range of 30<span>( ^{circ })</span>–135<span>( ^{circ })</span> have been measured for the first time. The data has been analyzed by using the exciton model, along with multistep direct and multistep compound models to evaluate the adequacy of the theoretical models in explaining the measured data. Our calculations indicate that the exciton model captures the general trends and oscillatory structures of the spectra at higher proton energies; however, the agreement between theory and experiment remains qualitative, reflecting the inherent complexity of pre-equilibrium reaction mechanisms.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01603-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Filling fractions for the formation of nuclear pasta in neutron stars: semiclassical vs liquid-drop predictions 中子星核面食形成的填充分数：半经典vs液滴预测
IF 2.8 3区 物理与天体物理
The European Physical Journal A Pub Date : 2025-06-10 DOI: 10.1140/epja/s10050-025-01594-6
Nikolai N. Shchechilin, Nicolas Chamel, Andrey I. Chugunov
{"title":"Filling fractions for the formation of nuclear pasta in neutron stars: semiclassical vs liquid-drop predictions","authors":"Nikolai N. Shchechilin,&nbsp;Nicolas Chamel,&nbsp;Andrey I. Chugunov","doi":"10.1140/epja/s10050-025-01594-6","DOIUrl":"10.1140/epja/s10050-025-01594-6","url":null,"abstract":"<div><p>Historically, a sequence of nuclear pasta shapes was predicted to appear in the deepest region of the inner crust of a neutron star within the compressible liquid-drop picture, when the filling fraction <i>u</i> exceeds some threshold values. However, later calculations showed that these values depend on the details of the liquid-drop model. Here we investigate the existence of pasta in neutron stars within the semiclassical extended Thomas-Fermi approach using various generalized Skyrme functionals. The filling fractions for the different transitions are found to be quasi-universal, unlike the pasta density ranges governed by the symmetry energy at relevant densities. In particular, pasta emerge at <span>(u_textrm{sp}approx 0.13,-, 0.15)</span>. By applying a simplified stability criterion within the liquid-drop framework, we show that these values of <span>(u_textrm{sp})</span> can be explained by the nuclear curvature correction. In this way, the abundance of pasta can be easily estimated. This criterion can also be used to optimize the search of pasta within the more realistic extended Thomas-Fermi approach.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145164495","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
Exploring baryon resonances with transition generalized parton distributions: status and perspectives 利用跃迁广义部子分布探索重子共振：现状与展望
IF 2.8 3区 物理与天体物理
The European Physical Journal A Pub Date : 2025-06-06 DOI: 10.1140/epja/s10050-025-01552-2
S. Diehl, K. Joo, K. Semenov-Tian-Shansky, C. Weiss, V. Braun, W. C. Chang, P. Chatagnon, M. Constantinou, Y. Guo, P. T. P. Hutauruk, H. S. Jo, A. Kim, J.-Y. Kim, P. Kroll, S. Kumano, C.-H. Lee, S. Liuti, R. McNulty, H.-D. Son, P. Sznajder, A. Usman, C. Van Hulse, M. Vanderhaeghen, M. Winn
{"title":"Exploring baryon resonances with transition generalized parton distributions: status and perspectives","authors":"S. Diehl,&nbsp;K. Joo,&nbsp;K. Semenov-Tian-Shansky,&nbsp;C. Weiss,&nbsp;V. Braun,&nbsp;W. C. Chang,&nbsp;P. Chatagnon,&nbsp;M. Constantinou,&nbsp;Y. Guo,&nbsp;P. T. P. Hutauruk,&nbsp;H. S. Jo,&nbsp;A. Kim,&nbsp;J.-Y. Kim,&nbsp;P. Kroll,&nbsp;S. Kumano,&nbsp;C.-H. Lee,&nbsp;S. Liuti,&nbsp;R. McNulty,&nbsp;H.-D. Son,&nbsp;P. Sznajder,&nbsp;A. Usman,&nbsp;C. Van Hulse,&nbsp;M. Vanderhaeghen,&nbsp;M. Winn","doi":"10.1140/epja/s10050-025-01552-2","DOIUrl":"10.1140/epja/s10050-025-01552-2","url":null,"abstract":"<div><p>QCD gives rise to a rich spectrum of excited baryon states. Understanding their internal structure is important for many areas of nuclear physics, such as nuclear forces, dense matter, and neutrino-nucleus interactions. Generalized parton distributions (GPDs) are an established tool for characterizing the QCD structure of the ground-state nucleon. They are used to create 3D tomographic images of the quark/gluon structure and quantify the mechanical properties such as the distribution of mass, angular momentum, and forces in the system. Transition GPDs extend these concepts to <span>(N rightarrow N^*)</span> transitions and can be used to characterize the 3D structure and mechanical properties of baryon resonances. They can be probed in high-momentum-transfer exclusive electroproduction processes with resonance transitions <span>(e + N rightarrow e' + M + N^*)</span>, such as deeply-virtual Compton scattering (<span>(M = gamma )</span>) or meson production (<span>(M = pi , K)</span>, etc.), and in related photon/hadron-induced processes. This White Paper describes a research program aiming to explore baryon resonance structure with transition GPDs. This includes the properties and interpretation of the transition GPDs, theoretical methods for structures and processes, first experimental results from JLab 12 GeV, future measurements with existing and planned facilities (JLab detector and energy upgrades, COMPASS/AMBER, EIC, EicC, J-PARC, LHC ultraperipheral collisions), and the theoretical and experimental developments needed to realize this program.</p></div>","PeriodicalId":786,"journal":{"name":"The European Physical Journal A","volume":"61 6","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epja/s10050-025-01552-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145162542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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
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