The European Physical Journal C最新文献

{"title":"Effect of spin-spin interaction and fractional order on heavy pentaquark masses under topological defect space-times","authors":"D. Nga Ongodo,&nbsp;A. A. Atangana Likéné,&nbsp;J. M. Ema’a Ema’a,&nbsp;P. Ele Abiama,&nbsp;G. H. Ben-Bolie","doi":"10.1140/epjc/s10052-025-14071-7","DOIUrl":"10.1140/epjc/s10052-025-14071-7","url":null,"abstract":"<div><p>In this paper, we investigate the masses of heavy pentaquark states under the influence of a spin-spin interaction term within a torsion-free fractal space-time with a point-like global monopole. The application and presence of fractional derivative is established from the outset. New operators are constructed using the definition of fractional derivative, and fractional-order Schrödinger equation is derived from these operators. The Hamiltonian operator is constructed with a two-part interaction potential: a spin-independent part containing Cornell potential, inversely quadratic and harmonic oscillator terms and a spin-dependent part containing a spin-spin interaction term to break the degeneracy between spin singlets and triplets. The spin dependence in our model arises from the harmonic approximation of the Gaussian function included in the spin-spin interaction term. This approximation facilitates obtaining analytical solutions for the bound states of heavy pentaquarks, expressed in terms of bi-confluent Heun functions. To achieve precise mass calculations for these pentaquarks using our model, various factors have been considered, including spin configurations, color and flavor combinations. Thus, we obtained the ground state masses for pentaquark containing two heavy quarks and having spin-parity <span>(frac{1}{2}^{-})</span>, <span>(frac{3}{2}^{-})</span> and <span>(frac{5}{2}^{-})</span>. Our results show consistency with previous calculations and are improved when experimental data are available, highlighting the relevance of fractional models and topological defects in heavy pentaquark mass calculations.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14071-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143809113","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":"On a free Dirac–Born–Infeld interacting vacuum model","authors":"Daniele Gregoris","doi":"10.1140/epjc/s10052-025-14068-2","DOIUrl":"10.1140/epjc/s10052-025-14068-2","url":null,"abstract":"<div><p>In this paper, we will propose a novel interacting vacuum model whose energy flow is modeled according to the free Dirac–Born–Infeld theory and hydrodynamically realized via the (Modified) Berthelot equation of state. By employing dynamical system techniques, we will identify a suitable late-time attractor which can realistically account for the present-day configuration of the universe, addressing the coincidence problem, supporting an accelerated expansion without breaking any energy condition, free from fine-tuning issues on initial conditions, and stable also at the perturbative level. Analytical closed-form results for the redshift evolution of both vacuum energy and dark matter will be presented. We will provide as well two distinctive fingerprints of our model, useful for its sharp identification inside the rich zoo of literature interacting vacuum models: a vacuum equation of state via geometric curvature scalars, and an analytical relationship between the statefinder variables. We will eventually show that our scenario actually consists in a running (or decaying) vacuum, with consequent production of dark matter particles, also comparing and contrasting its cosmological applicability with that of other known interacting vacuum paradigms. Our work therefore belongs to the line of research scrutinizing the relevance of quantum field theory approaches to the taming of current observational tensions.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14068-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143809315","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":"Application of fragmentation function to the indirect production of fully charmed tetraquark","authors":"Hong-Hao Ma,&nbsp;Zheng-Kui Tao,&nbsp;Juan-Juan Niu","doi":"10.1140/epjc/s10052-025-14128-7","DOIUrl":"10.1140/epjc/s10052-025-14128-7","url":null,"abstract":"<div><p>The indirect production mechanisms of fully charmed tetraquark are analyzed using the NRQCD factorization and Suzuki approach, respectively. The process first produces a heavy charm quark through Higgs, <span>(W^+)</span>, or <span>(Z^0)</span> decay, and then the resulting charm quark evolves into an <i>S</i>-wave fully charmed tetraquark state with quantum number <span>(J^{PC})</span>, including <span>(0^{++})</span>, <span>(1^{+-})</span>, and <span>(2^{++})</span>, via the fragmentation function. While the transverse momentum <span>(langle vec {q}_T^2rangle )</span> in Suzuki approach ranges from 2.01 to 299.04 <span>(text {GeV}^2)</span>, the numerical results obtained from these two approaches are consistent with each other. The decay widths, branching ratios, and produced events would be predicted at LHC and CEPC, respectively. The corresponding theoretical uncertainty of heavy quark mass <span>(m_c)</span> and distribution of energy fraction are also presented. The results show that the contribution for the production of <span>(T_{4c})</span> through <span>(W^+)</span> decay channel at LHC is relatively large. At CEPC, a sufficient number of <span>(T_{4c})</span> events are produced through <span>(Z^0)</span> decays, which is likely to be detected in future experiments.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14128-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143801212","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":"Greybody factor for an electrically charged regular-de Sitter black holes in d-dimensions","authors":"Md Sabir Ali,&nbsp;A. Naveena Kumara,&nbsp;Kartheek Hegde,&nbsp;C. L. Ahmed Rizwan,&nbsp;Shreyas Punacha,&nbsp;K. M. Ajith","doi":"10.1140/epjc/s10052-025-14121-0","DOIUrl":"10.1140/epjc/s10052-025-14121-0","url":null,"abstract":"<div><p>We investigate the propagation of scalar fields in the gravitational background of higher-dimensional, electrically charged, regular de Sitter black holes. Using an approximate analytical approach, we derive expressions for the greybody factor for both minimally and non-minimally coupled scalar fields. In the low-energy regime, we find that the greybody factor remains non-zero for minimal coupling but vanishes for non-minimal coupling, indicating a significant influence of curvature coupling on the emission profile. Examining the greybody factor alongside the effective potential, we explore how particle parameters (the angular momentum number and the non-minimal coupling constant) and spacetime parameters (the dimension, the cosmological constant, and the non-linear charge parameter) affect particle emission. While non-minimal coupling and higher angular momentum modes generally suppress the greybody factor, the non-linear charge parameter enhances it. We then compute the Hawking radiation spectra for these black holes and observe that, despite the non-linear charge enhancing the greybody factor, both non-minimal coupling and the non-linear charge ultimately reduce the total energy emission rate. These results provide insights into how modifications to classical black hole solutions in higher dimensions, through the inclusion of non-linear electrodynamics, impact their quantum emission properties.\u0000\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14121-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143793184","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":"Holographic inflation and holographic dark energy from entropy of the anti-de Sitter black hole","authors":"Qihong Huang,&nbsp;He Huang,&nbsp;Bing Xu,&nbsp;Kaituo Zhang","doi":"10.1140/epjc/s10052-025-14113-0","DOIUrl":"10.1140/epjc/s10052-025-14113-0","url":null,"abstract":"<div><p>Based on the entropy of anti-de Sitter black hole, a new holographic dark energy model has been proposed. When the Hubble horizon and particle horizon are chosen as the IR cutoff, the late-time accelerated expansion of universe is realized. In this paper, we consider the Hubble horizon as the IR cutoff to investigate holographic inflation and slow-roll inflation in this model. We find that slow-roll inflation with the chaotic potential <span>(V_{0}phi ^{n})</span> is favored by Planck results for some special cases, such as <span>(n=1/3)</span> and <span>(n=1/2)</span>, while holographic inflation is not supported by Planck results. Then, we analyze the reheating temperature and the number of reheating e-folds in this model, and we find that the results favor the cases <span>(n=1/3)</span> and <span>(n=1/2)</span>. Finally, we use the dynamical analysis method, statefinder diagnostic pairs, and the Hubble diagram to analyze this model. Our results indicate that when <span>(b^{2})</span> takes a small value, this model cannot be distinguished from the standard <span>(Lambda )</span>CDM model and can serve as an alternative to it.\u0000\u0000\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14113-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143793183","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":"Impacts of dark energy on weighing neutrinos after DESI BAO","authors":"Guo-Hong Du,&nbsp;Peng-Ju Wu,&nbsp;Tian-Nuo Li,&nbsp;Xin Zhang","doi":"10.1140/epjc/s10052-025-14094-0","DOIUrl":"10.1140/epjc/s10052-025-14094-0","url":null,"abstract":"<div><p>Recently, DESI has released baryon acoustic oscillation (BAO) data, and DES has also published its 5-year supernova (SN) data. These observations, combined with cosmic microwave background (CMB) data, support a dynamically evolving dark energy at a high confidence level. When using cosmological observations to weigh neutrinos, the results will be significantly affected by the measurement of dark energy due to the degeneracy between neutrino mass and the dark-energy equation of state. Therefore, we need to understand how the dynamical evolution of dark energy in the current situation will affect the measurement of neutrino mass. In this work, we utilize these latest observations and other additional distance measurements to discuss the mutual influence between neutrinos and dark energy, then calculate the Bayes factor to compare models. We consider three neutrino mass hierarchies, namely degenerate hierarchy (DH), normal hierarchy (NH), and inverted hierarchy (IH), as well as three dark energy models including <span>(Lambda {textrm{CDM}},)</span> <span>(w{textrm{CDM}},)</span> and <span>(w_0w_a {textrm{CDM}})</span> models. We find that cosmological data combined with the prior of particle physics experiments can provide strong to decisive evidence favoring the <span>(w_0w_a {{textrm{CDM}}}+sum m_nu )</span> model with NH. In the <span>(w_0w_a {textrm{CDM}})</span> model, using the CMB+DESI+DESY5 data, we obtain constraints on the total neutrino mass, <span>(sum m_nu &lt;0.171~{textrm{eV}}, 0.204~{textrm{eV}}, 0.220~{textrm{eV}},)</span> for DH, NH, and IH, respectively. Furthermore, taking into account the neutrino hierarchy or incorporating additional distance measurements results in a more pronounced deviation from the <span>(Lambda )</span>CDM model for dark energy. The latter, in particular, exhibits a deviation at a confidence level that surpasses <span>(4sigma .)</span>\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14094-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143786551","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":"Gravitating Skyrmions with localized fermions","authors":"Vladimir Dzhunushaliev,&nbsp;Vladimir Folomeev,&nbsp;Jutta Kunz,&nbsp;Yakov Shnir","doi":"10.1140/epjc/s10052-025-14074-4","DOIUrl":"10.1140/epjc/s10052-025-14074-4","url":null,"abstract":"<div><p>We consider self-gravitating Skyrmions in the presence of Dirac fermions, that carry spin and isospin. By varying the gravitational and the Yukawa coupling constants, we investigate the spectral flow of the fermion eigenvalue associated with a zero mode in the absence of gravity. We demonstrate that the backreaction of the fermion can strongly influence the Skyrmion-fermion configurations. In particular, the energy conditions may be violated, and regular anti-gravitating asymptotically flat solutions with negative ADM mass may emerge.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14074-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143786552","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 mechanism to generate varying speed of light via Higgs-dilaton coupling: theory and cosmological applications","authors":"Hoang Ky Nguyen","doi":"10.1140/epjc/s10052-025-14082-4","DOIUrl":"10.1140/epjc/s10052-025-14082-4","url":null,"abstract":"<div><p>We probe into a class of scale-invariant actions, which allow the Higgs field <span>(Phi )</span> to interact with a dilaton field <span>(chi )</span> of the background spacetime through the term <span>(chi ^{2},Phi ^{dagger }Phi )</span>. Upon spontaneous gauge symmetry breaking, the vacuum expectation value (VEV) of the Higgs field becomes proportional to <span>(chi )</span>. Although this linkage is traditionally employed to make the Planck mass and particle masses dependent on <span>(chi )</span>, we present an <i>alternative</i> mechanism: the Higgs VEV will be used to <i>construct</i> Planck’s quantum of action <span>(hbar )</span> and speed of light <i>c</i>. Specifically, each open set vicinity of a given point <span>(x^{*})</span> on the spacetime manifold is equipped with a replica of the Glashow–Weinberg–Salam action operating with <i>its own effective values of </i><span>(hbar _{*})</span> <i>and </i><span>(c_{*})</span> per <span>(hbar _{*}propto chi ^{-1/2}(x^{*}))</span> and <span>(c_{*}propto chi ^{1/2}(x^{*}))</span>, causing these “fundamental constants” to vary alongside the dynamical field <span>(chi )</span>. Moreover, in each open set around <span>(x^{*})</span>, the prevailing value <span>(chi (x^{*}))</span> determines the length and time scales for physical processes occurring in this region as <span>(lpropto chi ^{-1}(x^{*}))</span> and <span>(tau propto chi ^{-3/2}(x^{*}))</span>. This leads to an <i>anisotropic</i> relation <span>(tau ^{-1}propto l^{-3/2})</span> between the rate of clocks and the length of rods, resulting in a distinct set of novel physical phenomena. For late-time cosmology, the variation of <i>c</i> along the trajectory of light waves from distant supernovae towards the Earth-based observer necessitates modifications to the Lemaître redshift formula, the Hubble law, and the luminosity distance–redshift relation. These modifications are capable of: (1) Accounting for the Pantheon Catalog of Type Ia supernovae <i>through a declining speed of light in an expanding Einstein–de Sitter universe</i>, thus avoiding the need for dark energy; (2) Revitalizing Blanchard–Douspis–Rowan-Robinson–Sarkar’s CMB power spectrum analysis that bypassed dark energy; and (3) Resolving the <span>(H_{0})</span> tension without requiring a dynamical dark energy component.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14082-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143793128","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":"New insights into the doubly charmed exotic mesons","authors":"Di Guo,&nbsp;Qin-He Yang,&nbsp;Ling-Yun Dai,&nbsp;A. P. Szczepaniak","doi":"10.1140/epjc/s10052-025-14111-2","DOIUrl":"10.1140/epjc/s10052-025-14111-2","url":null,"abstract":"<div><p>Using effective Lagrangians constrained by the heavy quark spin symmetry and chiral symmetry, for the light quarks, we analyze the <span>(D^0 D^0pi ^+,)</span> <span>(bar{D}^0D^0pi ^0)</span> and <span>(D^0bar{D}^{*0})</span> invariant mass spectra. Performing a simultaneous analysis of the doubly charmed and charm-anti-charm states gives further insights into the nature of the <span>(T^+_{cc})</span> and <span>(chi ^0_{c1}(3872),)</span> exotic hadrons. It is confirmed that both states should lie below their respective <span>(DD^*)</span>/<span>(Dbar{D}^*)</span> thresholds. Also, the contributions of the triangle and box diagrams are negligible.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14111-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143778089","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":"Forecasts for decaying dark matter from cross-correlation between line intensity mapping and large scale structures surveys","authors":"Jiali Wu,&nbsp;Jun-Qing Xia","doi":"10.1140/epjc/s10052-025-14079-z","DOIUrl":"10.1140/epjc/s10052-025-14079-z","url":null,"abstract":"<div><p>Axion-like particles (ALPs) are compelling candidates for dark matter with a broad range of possible masses and coupling strengths. These particles decay into two photons, contributing to cosmic background radiation, which may correlate with large-scale structure (LSS). ALPs with a mass around 1 eV decay into monochromatic photons in the near-infrared spectrum, which can be detected by the upcoming SPHEREx mission using line intensity mapping (LIM) technology. To search for ALP signals in SPHEREx, we calculate the cross angular power spectrum between the intensity maps and LSS probes. We employ several LSS probes, including galaxy clustering and weak lensing surveys conducted by the China Space Station Telescope (CSST), as well as CMB lensing performed by CMB-S4. Using a Fisher analysis, we place constraints on the ALP parameters, with uncertainties of <span>(sigma (m_a) = 0.062)</span> and <span>(sigma (g_{agamma gamma }) = 0.19)</span> from the joint surveys. Our results suggest that the current bounds on <span>(g_{agamma gamma })</span> could be improved by an order of magnitude for ALPs in the mass range around 1 eV. The cross-correlation also allows for detection of star formation lines observed by SPHEREx, providing constraints on the amplitude and redshift exponent of their power spectrum with uncertainties of <span>(sigma (A_text {astro}) = 0.004)</span> and <span>(sigma (eta _text {astro}) = 0.004)</span>, respectively. Additionally, we consider intrinsic alignment (IA) as a systematic effect in the weak lensing survey. The IA amplitude and exponent are well constrained by the LIM-WL cross-correlation, yielding results of <span>(sigma (A_{text {IA}}) = 0.016)</span> and <span>(sigma (eta _{text {IA}}) = 0.025)</span>, which offer significant improvements over previous works related to CSST.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 4","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14079-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143778114","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}