The European Physical Journal C最新文献

{"title":"Topological perspective on bulk boundary thermodynamic equivalence","authors":"Si-Jiang Yang,&nbsp;Shan-Ping Wu,&nbsp;Shao-Wen Wei,&nbsp;Yu-Xiao Liu","doi":"10.1140/epjc/s10052-026-15745-6","DOIUrl":"10.1140/epjc/s10052-026-15745-6","url":null,"abstract":"<div><p>We establish an exact duality between the extended thermodynamics of five-dimensional charged Gauss–Bonnet AdS black holes and the thermodynamic framework of the dual boundary conformal field theory (CFT). The thermodynamics of the dual CFT involves two central charges originating from the trace anomaly. We demonstrate a precise correspondence between the extended first laws on the bulk and boundary sides. Moreover, the topological charges of the CFT thermodynamics, associated with the phase transition and critical point, coincide with those of the corresponding bulk black hole.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 5","pages":""},"PeriodicalIF":4.8,"publicationDate":"2026-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-15745-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147829793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Mass spectroscopy and strong decays of open charm-strange mesons using relativistic Dirac formalism","authors":"Bhoomika Pandya,&nbsp;Manan Shah,&nbsp;P. C. Vinodkumar","doi":"10.1140/epjc/s10052-026-15725-w","DOIUrl":"10.1140/epjc/s10052-026-15725-w","url":null,"abstract":"<div><p>The mass spectra of charm-strange mesons including ground, radial and orbital excitations have been calculated within a relativistic Dirac framework. The predicted masses of the first orbital excited state 1<i>P</i> exhibits excellent agreement with values reported by the PDG. Utilizing these mass predictions and an effective Lagrangian approach based on heavy quark and chiral symmetries, we have computed the OZI allowed two body strong decay widths of higher excited state candidates of charm-strange sector. The resulting partial widths and branching ratios enable the assignment of spin-parity quantum numbers to several newly observed charm-strange states. In particular, we identify <span>(D_{sJ}(2700))</span> as the <span>(2^3S_1)</span>, <span>(D_{s0}(2590))</span> as the <span>(2^1S_0)</span>, <span>(D_{sJ}(2860))</span> as the <span>(1^3D_3)</span>, <span>(D_{s1}(2860))</span> as the <span>(1^3D_1)</span> and <span>(D_{sJ}(3040))</span> as the <span>(2^1P_1)</span> states. The effective coupling constants <span>(g_T)</span>, <span>(g_X)</span>, <span>(g_Y)</span>, <span>(tilde{g}_S)</span> and <span>(tilde{g}_H)</span> determined in the present study appear to be consistent with the reported values. Furthermore, the <span>(D^*K)</span> decay channel emerges as the most promising mode for the experimental search of the missing <span>(1^3D_2)</span> and <span>(1^1D_2)</span> states, while the <span>(2^3P_0)</span> state is more likely to be observed through the <i>DK</i> channel.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 5","pages":""},"PeriodicalIF":4.8,"publicationDate":"2026-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-15725-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147829796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Field-theoretic versus data-driven evaluations of electromagnetic corrections to hadronic vacuum polarization in ((g-2)_mu )","authors":"Volodymyr Biloshytskyi,&nbsp;Dominik Erb,&nbsp;Harvey B. Meyer,&nbsp;Julian Parrino,&nbsp;Vladimir Pascalutsa","doi":"10.1140/epjc/s10052-026-15521-6","DOIUrl":"10.1140/epjc/s10052-026-15521-6","url":null,"abstract":"<div><p>The Standard Model prediction of the muon <span>(g-2)</span> increasingly depends on lattice QCD computations of the hadronic vacuum polarization (HVP), where the isospin-breaking (IB) effects remain a significant source of uncertainty. To complement the lattice QCD evaluations, the data-driven approach to HVP has been used to assess some of the electromagnetic IB effects, in particular from the channels with a photon in the final state, e.g., <span>(e^+e^-rightarrow pi ^0 gamma )</span>. Here we argue that such contributions are largely canceled by virtual electromagnetic corrections to the purely hadronic channels: <span>(pi ^+ pi ^-)</span>, <span>(pi ^+ pi ^- pi ^0)</span>, etc. We identify these leading corrections by performing a field-theoretic calculation in a vector-meson dominance model, thereby reconciling the timelike and spacelike approaches to electromagnetic effects. Although these virtual corrections are more difficult to extract in a systematic manner, addressing them is essential for the data-driven method to consistently complement the lattice QCD program.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 5","pages":""},"PeriodicalIF":4.8,"publicationDate":"2026-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-15521-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147830134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Nucleosynthesis and CMB bounds on photophilic ALPs: a fresh look","authors":"Miguel Escudero Abenza,&nbsp;Clara Garcia-Perez,&nbsp;Maksym Ovchynnikov","doi":"10.1140/epjc/s10052-026-15544-z","DOIUrl":"10.1140/epjc/s10052-026-15544-z","url":null,"abstract":"<div><p>We provide a fresh look at the cosmological constraints on axion-like particles (ALPs) that couple predominantly to photons, focusing on lifetimes <span>(tau _{a} lesssim 10^{4}, textrm{s})</span> and masses <span>(m_alesssim 10,textrm{GeV})</span>. We consider Big Bang nucleosynthesis (BBN) and Cosmic Microwave Background (CMB) bounds and explore how these limits depend upon the unknown reheating temperature of the Universe, <span>(T_textrm{reh})</span>. Compared with some previous studies, we account for the rare decays of these ALPs into light hadrons and show that this leads to extended constraints for several reheating temperatures. Our limits are cast in a model-independent way, and we identify regions of parameter space where these ALPs could alleviate small tensions in the determinations of <span>(N_textrm{eff})</span> and the deuterium abundance. Our Mathematica BBN code <span>BBNEasyALP</span> is publicly available at .\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 5","pages":""},"PeriodicalIF":4.8,"publicationDate":"2026-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-15544-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147830193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"A new method for estimating unknown one-order higher QCD corrections to the perturbative series using the linear regression through the origin","authors":"Zhi-Fei Wu,&nbsp;Xing-Gang Wu,&nbsp;Jiang Yan,&nbsp;Xu-Dong Huang,&nbsp;Jian-Ming Shen","doi":"10.1140/epjc/s10052-026-15506-5","DOIUrl":"10.1140/epjc/s10052-026-15506-5","url":null,"abstract":"<div><p>Quantum chromodynamics (QCD) is the fundamental theory describing strong interactions. Owing to asymptotic freedom at short distances, high-energy physical observables can be predicted using perturbative QCD (pQCD) following proper factorization. It has been demonstrated that the conventional renormalization scheme-and-scale ambiguities that appear in fixed-order pQCD series can be eliminated by recursively applying the renormalization group equation, aided by the principle of maximum conformality (PMC). To extend the predictive power of pQCD, we still face the challenge of reliably estimating contributions from unknown higher-order (UHO) terms. In this paper, we propose a novel method for estimating one-order higher QCD corrections to the perturbative series: using linear regression through the origin (LRTO) to determine the asymptotic form of the pQCD series below the optimal truncation order <span>(N^*)</span>. When the given <span>(alpha _s)</span>-order is below <span>(N^*)</span>, its perturbative behavior will be dominated by the usual <span>(alpha _s)</span>-power suppression and the sub-leading corrections are treated as a source of theoretical uncertainty. This approach enables a quantitative assessment of the series convergence and derives estimate for unknown higher-order contributions. To illustrate this method, we apply it to the important ratio <span>(R_tau )</span> which has been calculated up to four-loop QCD corrections. Our results show that the LRTO method yields reliable estimates of the UHO terms, demonstrating its own reliability and significant predictive power for such estimations. In particular, we find that the scale-invariant, more rapidly convergent PMC series exhibits better predictive power – along with greater stability and reliability – compared to the initial scale-dependent pQCD series.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 5","pages":""},"PeriodicalIF":4.8,"publicationDate":"2026-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-15506-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147829497","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Effect of non-conformal deformation on the gapped quasi-normal modes and the holographic implications","authors":"Ashis Saha,&nbsp;Sunandan Gangopadhyay","doi":"10.1140/epjc/s10052-026-15729-6","DOIUrl":"10.1140/epjc/s10052-026-15729-6","url":null,"abstract":"<div><p>The spectral curve of quasinormal modes for a massive real scalar field in the background of a non-conformal black brane geometry has been obtained by utilizing a Frobenius type near-horizon expansion. The gauge/gravity duality maps this to the computation of spectral curve of a massive scalar operator <span>(mathcal {O}_{phi })</span> for a large-<i>N</i> conformal field theory with irrelevant type non-conformal deformation. In this context, non-conformality has been holographically introduced by using the Einstein-dilaton theory with Liouville type dilaton potential as the bulk theory. It has been observed that the obtained quasinormal modes are characterized by specific gapped dispersion relations. The pole-skipping points have also been computed and classified based upon different dispersion relations satisfied by them. The effect of non-conformality is evident from these results. The radius of convergence of the derivative expansion in the momentum space is then computed from the critical points of the spectral curve. It has been observed that presence of non-conformality increases the domain of applicability of the derivative expansion in momentum space, as it increases the radius of convergence for a given conformal dimension. The comparison between the convergence radii and the absolute momenta corresponding to lowest order pole-skipping points also leads to some interesting findings.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 5","pages":""},"PeriodicalIF":4.8,"publicationDate":"2026-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-15729-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147829333","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Hybrid meson pseudopotentials from a holographic model with gluon condensation","authors":"Jing Zhou,&nbsp;Mengjun Zhu","doi":"10.1140/epjc/s10052-026-15728-7","DOIUrl":"10.1140/epjc/s10052-026-15728-7","url":null,"abstract":"<div><p>Utilizing the holographic gauge/gravity duality, we investigate the behavior of hybrid mesons in the presence of gluon condensation. By incorporating a localized defect into a dilaton-gravity background to simulate gluonic excitations, we study the interquark distance and the associated pseudopotential. The results show that the hybrid pseudopotential follows a quadratic behavior that intensifies with the gluon condensate. Furthermore, the reduction in screening length indicates that increased condensation promotes the dissociation of these exotic states.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 5","pages":""},"PeriodicalIF":4.8,"publicationDate":"2026-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-15728-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147829407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Effective field description of vector and tensorial couplings in exotic spinor dynamics: a geometrical approach to Rashba-like interactions","authors":"Luís R. dos Santos Filho","doi":"10.1140/epjc/s10052-026-15723-y","DOIUrl":"10.1140/epjc/s10052-026-15723-y","url":null,"abstract":"<div><p>We investigate the physical consequences of incorporating nontrivial spacetime topology into the dynamics of spinor fields through a geometrical reformulation of exotic spinor structures. By embedding the topological correction directly into the Dirac matrices, we construct an effective framework in which topology manifests as a modification of the spacetime metric and of the associated coupling currents. Within this setting, we derive explicit expressions for the vector and tensorial currents and show that the resulting structure naturally contains a spin-orbit interaction analogous to the Rashba effect. In the non-relativistic limit, the gradient of the topological function plays the role of an effective background field responsible for spin splitting, without the introduction of external electromagnetic interactions. We further analyze the corresponding energy–momentum tensor and demonstrate that the modified dynamics leads to a nontrivial conservation law, which can be interpreted as an effective exchange between the fermionic sector and the topological background. This mechanism gives rise to quasinormal-mode behavior and to birefringent dispersion relations associated with emergent Lorentz-violating effects. Our results establish a direct bridge between exotic spinor geometry, topological structures, and effective spin-orbit and Lorentz-violating phenomena, providing a unified framework that connects geometric topology with observable dynamical consequences.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 5","pages":""},"PeriodicalIF":4.8,"publicationDate":"2026-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-15723-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147829549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Accretion with shock cone morphology onto charged black holes in dilaton-massive gravity","authors":"Asifa Ashraf,&nbsp;Orhan Dönmez,&nbsp;Chengxun Yuan,&nbsp;Abdelmalek Bouzenada,&nbsp;Allah Ditta,&nbsp;Ahmadjon Abdujabbarov","doi":"10.1140/epjc/s10052-026-15642-y","DOIUrl":"10.1140/epjc/s10052-026-15642-y","url":null,"abstract":"<div><p>This study tested accretion onto a charged scalar black hole (BH) model within a massive-gravity framework. In this context, the analysis emphasizes the detailed dynamics of infalling matter, the determination of sonic points, and the response of different test fluids under varying conditions. The background spacetime is described by a charged dilatonic BH solution, and the conservation laws for particle flux and energy-momentum are explicitly formulated to allow treatment as a dynamical system. By recasting the accretion equations into an autonomous system, the critical conditions corresponding to sonic transitions are systematically identified and analyzed. Also, many fluid models are considered, including isothermal, barotropic, and polytropic fluids, covering regimes from ultra-stiff to sub-relativistic. Each fluid model produces distinct modifications to the Hamiltonian trajectories and radial velocity profiles, thereby influencing the overall accretion pattern. The parameters of massive gravity, particularly <span>(c_1)</span> and <span>(c_2)</span>, shape the horizon structure, determine the positions of critical points, and potentially affect the formation and stability of accretion disks. The mass accretion rate, expressed in terms of metric function, fluid energy density, and radial inflow velocity, shows a decreasing trend with increasing <span>(c_1)</span> and <span>(c_2)</span>, which implies a reduction in accretion efficiency. Additionally, the radiative properties of thin disks, including emitted flux, disk temperature, radiative efficiency, and luminosity, are suppressed for higher values of these parameters. In this case, the results illustrate that massive gravity not only modifies the behavior of matter inflow but also substantially diminishes the radiative output, offering potentially observable differences that can distinguish charged scalar BHs in massive gravity from their counterparts in standard general relativity (GR). We also numerically model matter accretion via the Bondi–Hoyle–Lyttleton (BHL) mechanism in the framework of massive gravity, showing that the modified shock cone structure, mass accretion rate, and the resulting QPOs are consistent with theoretical expectations, and highlighting their observability and differences from GR.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 5","pages":""},"PeriodicalIF":4.8,"publicationDate":"2026-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-15642-y.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147829671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

{"title":"Light baryonium states with exotic quantum numbers","authors":"Bing-Dong Wan,&nbsp;Jun-Hao Zhang,&nbsp;Yan Zhang,&nbsp;Ming-Yang Yuan","doi":"10.1140/epjc/s10052-026-15718-9","DOIUrl":"10.1140/epjc/s10052-026-15718-9","url":null,"abstract":"<div><p>The existence of baryonium-bound or resonant states composed of a baryon and an antibaryon has long been postulated as a natural extension of conventional hadron spectroscopy. In the present work, we conduct a systematic investigation of the mass spectrum and internal configurations of light baryonium candidates exhibiting exotic quantum numbers that are inaccessible within the framework of the traditional quark model. Employing the method of QCD sum rules, we analyze nucleon–antinucleon and light hyperon–anti-hyperon systems with quantum numbers <span>(J^{PC}=0^{--})</span> and <span>(0^{+-})</span>, which are quantum number combinations prohibited for conventional mesonic states. Our analysis reveals the potential existence of two <span>(0^{--})</span> <span>(Lambda )</span>-<span>(bar{Lambda })</span> baryonium states with masses <span>((2.90pm 0.09))</span> GeV and <span>((3.36pm 0.09))</span> GeV, respectively, as well as two <span>(0^{+-})</span> <span>(Lambda )</span>-<span>(bar{Lambda })</span> states with masses <span>((2.91pm 0.07))</span> GeV and <span>((3.29pm 0.07))</span> GeV, respectively. In addition, corresponding nucleon–antinucleon partner states are identified at <span>((2.69pm 0.07))</span> GeV, <span>((3.07pm 0.08))</span> GeV, <span>((2.86pm 0.07))</span> GeV, and <span>((3.22pm 0.07))</span> GeV, respectively. Furthermore, analogous <span>(Xi )</span>-<span>(bar{Xi })</span> configurations are predicted with masses of <span>((3.10pm 0.09))</span> GeV, <span>((3.54pm 0.07))</span> GeV, <span>((3.08pm 0.08))</span> GeV, and <span>((3.45pm 0.08))</span> GeV, respectively. The possible decay modes of the light exotic baryonium states are analyzed, which are hopefully measurable in BESIII, BELLEII, and LHCb experiments.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"86 5","pages":""},"PeriodicalIF":4.8,"publicationDate":"2026-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-026-15718-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147829672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}