The European Physical Journal C最新文献

{"title":"Footprint in fitting (Brightarrow D) vector form factor and determination for D-meson leading-twist LCDA","authors":"Sheng-Bo Wu,&nbsp;Hai-Jiang Tian,&nbsp;Yin-Long Yang,&nbsp;Wei Cheng,&nbsp;Hai-Bing Fu,&nbsp;Tao Zhong","doi":"10.1140/epjc/s10052-025-14275-x","DOIUrl":"10.1140/epjc/s10052-025-14275-x","url":null,"abstract":"<div><p>In this paper, we fit the <span>(Brightarrow D)</span> vector transition form factor (TFF) by using the data measured by <i>BABAR</i> and Belle Collaborations within Monte Carlo (MC) method. Meanwhile, the <span>(Brightarrow D)</span> TFF is also calculated by using the QCD light-cone sum rules approach (LCSRs) within right-handed chiral current correlation function. In the TFF, <i>D</i>-meson leading-twist light-cone distribution amplitude (LCDA) is the most important non-perturbative input parameter, the precise behavior of which is mainly determined by the parameter <span>(B_{2;D})</span> in the light-cone harmonic oscillator model. Through fitting the TFF, we determine the value <span>(B_{2;D}=0.445)</span>. Then, we present the curve of <i>D</i>-meson leading-twist LCDA in comparison with other theoretical approaches. Subsequently, the <span>(Brightarrow D)</span> TFF <span>(f_{+}^{BD}(q^2))</span> at the large recoil region is <span>(f_{+}^{BD}(0)=0.648_{-0.063}^{+0.067})</span>, which is compared in detail with theoretical estimates and experimental measurements. Furthermore, we calculated the decay width and branching fractions of the Cabibbo-favored semileptonic decays <span>(Brightarrow Dell ^+nu _{ell })</span>, which lead to the results <span>({mathcal {B}}(B^0rightarrow D^-ell ^+nu _{ell }) =(2.10_{-0.38}^{+0.44})times 10^{-2})</span> and <span>({mathcal {B}}(B^+rightarrow {bar{D}}^0ell ^+nu _{ell }) =(2.26_{-0.41}^{+0.48})times 10^{-2})</span>. Finally, we predict the CKM matrix element with two scenarios <span>(|V_{cb}|_{textrm{SR}}=41.55_{-4.50}^{+4.91}times 10^{-3})</span> and <span>(|V_{cb} |_{textrm{MC}}=41.47_{-2.66}^{+2.55 }times 10^{-3})</span> from <span>(B^0rightarrow D^-ell ^+nu _{ell })</span>, <span>(|V_{cb}|_{textrm{SR}}=40.54_{-3.80}^{+4.33}times 10^{-3})</span> and <span>(|V_{cb} |_{textrm{MC}}=40.46_{-1.38}^{+1.40}times 10^{-3})</span> from <span>(B^+rightarrow {bar{D}}^0ell ^+nu _{ell })</span> which are in good agreement with theoretical and experimental predictions.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14275-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084806","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":"QPOs tests and circular motions of charged particles around magnetized Bocharova–Bronnikov–Melnikov–Bekenstein black holes","authors":"Sardor Murodov,&nbsp;Ashfaque H. Bokhari,&nbsp;Javlon Rayimbaev,&nbsp;Bobomurat Ahmedov","doi":"10.1140/epjc/s10052-025-14298-4","DOIUrl":"10.1140/epjc/s10052-025-14298-4","url":null,"abstract":"<div><p>Testing gravity theories beyond General Relativity (GR) is crucial for a deeper understanding of fundamental physics, especially in the strong gravitational field regime around astrophysical compact objects. This work examines quasi-periodic oscillations (QPOs) generated by charged particles orbiting magnetized Bocharova–Bronnikov–Melnikov–Bekenstein (BBMB) black holes. We study charged particles’ circular orbits, deriving expressions for energy and angular momentum influenced by scalar and magnetic interactions, and investigate the innermost stable circular orbit (ISCO). Using the relativistic precession (RP) model, we derive the fundamental orbital, radial, and vertical frequencies of charged particle oscillations, highlighting deviations caused by conformal scalar and magnetic interactions. Our analysis shows that the conformally coupled scalar field significantly modifies the spacetime curvature, producing a repulsive gravitational effect that shifts stable orbits outward, thereby reducing the radial oscillation frequency. Using observational QPO data from well-known astrophysical sources-GRS 1915+105, GRO J1655-40, M82 X-1, and Sgr A*-we performed Markov Chain Monte Carlo (MCMC) simulations to constrain black hole mass, scalar coupling, magnetic interaction, and orbital radius parameters. Our results reveal significant deviations from standard General Relativity predictions, offering clear evidence of scalar and magnetic field influences. These findings indicate that scalar and magnetic fields produce observable shifts in QPO frequencies, providing promising observational signatures to test alternative gravitational theories in extreme astrophysical environments.\u0000\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14298-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084959","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":"The effect of Lorentz symmetry violation on the hadron fragmentation function","authors":"S. Mohammad Moosavi Nejad,&nbsp;A. Yeganeh","doi":"10.1140/epjc/s10052-025-14291-x","DOIUrl":"10.1140/epjc/s10052-025-14291-x","url":null,"abstract":"<div><p>Different processes have been yet considered to investigate the effects of Lorentz symmetry violation and various bounds have been determined for the magnitude of Lorentz violation (LV) coefficients. In the present work we study, for the first time, the effect of Lorentz-violating terms on the fragmentation functions (FFs) of heavy mesons in two distinct cases correspondent to axial and vectorial nonminimal couplings in the theory of quantum chromodynamics (QCD). Our analytical results for heavy meson FFs in the framework of LV can be used to study the effect of Lorentz symmetry violation on hadron production processes in high energy colliders.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14291-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084960","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 the determination of the interaction time of GeV neutrinos in large argon gas TPCs","authors":"A. Saá-Hernández,&nbsp;D. González-Díaz,&nbsp;J. Martín-Albo,&nbsp;M. Tuzi,&nbsp;P. Amedo,&nbsp;J. Baldonedo,&nbsp;C. Benítez,&nbsp;S. Bounasser,&nbsp;E. Casarejos,&nbsp;J. Collazo,&nbsp;A. Fernández-Prieto,&nbsp;D. J. Fernández-Posada,&nbsp;R. Hafeji,&nbsp;S. Leardini,&nbsp;D. Rodas-Rodríguez,&nbsp;A. L. Saborido,&nbsp;A. Segade,&nbsp;A. Slater","doi":"10.1140/epjc/s10052-025-14248-0","DOIUrl":"10.1140/epjc/s10052-025-14248-0","url":null,"abstract":"<div><p>Next-generation megawatt-scale neutrino beams open the way to studying neutrino-nucleus scattering using gaseous targets for the first time. This represents an opportunity to improve the knowledge of neutrino cross sections in the energy region between hundreds of MeV and a few GeV, of interest for the upcoming generation of long-baseline neutrino oscillation experiments. The challenge is to accurately track and (especially) time the particles produced in neutrino interactions in large and seamless volumes down to few-MeV energies. We propose to accomplish this through an optically-read time projection chamber (TPC) filled with high-pressure argon and equipped with both tracking and timing functions. In this work, we present a detailed study of the time-tagging capabilities of such a device, based on end-to-end optical simulations that include the effect of photon propagation, photosensor response, dark count rate and pulse reconstruction. We show that the neutrino interaction time can be reconstructed from the primary scintillation signal with a precision in the range of 1–2.5 ns <span>((sigma ))</span> for point-like deposits with energies down to 5 MeV. A similar response is observed for minimum-ionizing particle tracks extending over lengths of a few meters. A discussion on previous limitations towards such a detection technology, and how they can be realistically overcome in the near future thanks to recent developments in the field, is presented. The performance demonstrated in our analysis seems to be well within reach of next-generation neutrino-oscillation experiments, through the instrumentation of the proposed TPC with conventional reflective materials and a silicon photomultiplier array behind a transparent cathode.\u0000\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14248-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144084886","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":"Searching for gluino LSP at the LHC","authors":"Paulina Knees,&nbsp;Essodjolo Kpatcha,&nbsp;Iñaki Lara,&nbsp;Daniel E. López-Fogliani,&nbsp;Carlos Muñoz,&nbsp;Natsumi Nagata,&nbsp;Hidetoshi Otono","doi":"10.1140/epjc/s10052-025-14199-6","DOIUrl":"10.1140/epjc/s10052-025-14199-6","url":null,"abstract":"<div><p>We analyse relevant signals expected at the LHC, assuming that the gluino is the lightest supersymmetric particle (LSP) in the framework of the <span>(mu nu )</span>SSM. In this <i>R</i>-parity violating model, the presence of couplings involving right-handed neutrinos solves simultaneously the <span>(mu )</span> problem and the accommodations of neutrino masses and mixing angles. We study gluino pair production in quark-antiquark and gluon-gluon collisions. The main decay channels for the gluino LSP are the three-body decays to two quarks and a lepton or a neutrino. In both cases, the leading channels occur for the third family of quarks. We compare the predictions of this scenario with LHC searches for prompt and long-lived particles. To analyse the parameter space we sample the <span>(mu nu )</span>SSM for a gluino LSP, paying special attention to reproduce the current experimental data on neutrino and Higgs physics, as well as flavour observables. Our results imply a lower limit on the mass of the gluino LSP of about 2600 GeV, and an upper limit for the decay length of about 6 cm.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14199-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074102","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":"Returning back to Mukhanov parametrization of inflationary equation of state","authors":"Barun Kumar Pal","doi":"10.1140/epjc/s10052-025-14259-x","DOIUrl":"10.1140/epjc/s10052-025-14259-x","url":null,"abstract":"<div><p>We have re-examined Mukhanov parametrization for inflationary equation of state, <span>(1+omega =frac{beta }{({N}+1)^alpha })</span>, in the light of Planck 2018 results and latest bound of tensor-to-scalar ratio employing Hamilton–Jacobi formalism. We have found that the current observational values of scalar spectral index and tensor-to-scalar ratio can be used efficiently to constrain the model parameters. The recent bound of <span>(r&lt;0.032)</span> has been used to put an upper bound on one of the model parameter. Whereas 1-<span>(sigma )</span> bound of the scalar spectral index <span>(0.9607le n_{_S}le 0.9691)</span> along with the upper bound of tensor-to-scalar ratio provided restriction on the other model parameter <span>(1.50&lt;alpha le 2.20)</span>. These bounds however depend on the number of e-foldings still left before the end of inflation and whenever <span>(1.50&lt;alpha le 2.20)</span> we can find appropriate values of the other model parameter <span>(beta )</span> so that the observational predictions are in tune with the latest available inflationary observables. We have further utilized the predictions from forthcoming CMB missions in the likes of CMB-S4 and LiteBIRD in order to obtain bounds on the model parameters. We find that detection of gravity waves would help us constrain the model parameters further. But in the absence of detection of primordial gravity wave signal by these CMB missions may rule out Mukhanov parametrization.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14259-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074008","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":"Ultra-high-energy event KM3-230213A constraints on Lorentz Invariance Violation in neutrino sector","authors":"Petr Satunin","doi":"10.1140/epjc/s10052-025-14240-8","DOIUrl":"10.1140/epjc/s10052-025-14240-8","url":null,"abstract":"<div><p>We discuss the constraints on superluminal neutrino Lorentz Invariance Violation (LIV) parameters from the observation of the ultra-high-energy event KM3-230213A by the KM3NeT collaboration in cases of linear <span>(n=1)</span> and quadratic <span>(n=2)</span> LIV scenarios. Assuming extragalactic origin of the event, we obtain the constraints on LIV mass scale <span>(Lambda _{n=1} = 1.1 times 10^{30}, text{ GeV })</span> and <span>(Lambda _{n=2} = 1.1 times 10^{19}, text{ GeV })</span> from the absence of neutrino splitting.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14240-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144073701","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":"Polarized image of an equatorial emitting ring around a rotating braneworld black hole","authors":"Xin Qin,&nbsp;Songbai Chen,&nbsp;Xiangyun Fu,&nbsp;Yang Huang,&nbsp;Jiliang Jing","doi":"10.1140/epjc/s10052-025-14285-9","DOIUrl":"10.1140/epjc/s10052-025-14285-9","url":null,"abstract":"<div><p>We have studied the polarized image of an equatorial emitting ring around a rotating braneworld black hole. This black hole possesses a tidal charge parameter <i>b</i>, which describes the effects of the free gravitational field in the bulk on the brane. Results show that the effects of the tidal charge parameter on the polarized image depend on the magnetic field structure, the observer inclination, the velocity of the fluid and the radii of the emitting ring. For a given value of the rotation parameter, the observed polarization intensity increases monotonously with <i>b</i> when the magnetic field lies in the equatorial plane, while it no longer changes monotonically with <i>b</i> when the magnetic field is perpendicular to the equatorial plane. The effect of parameter <i>b</i> on polarized images is similar in both stronger and weaker gravitational fields when the magnetic field is within the equatorial plane, and the differences in polarization vectors for different <i>b</i> become noticeable in stronger gravitational fields. We also probe the effects of <i>b</i> on the Stokes Q-U loops.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14285-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074007","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":"Three-loop verification of the equations relating running of the gauge couplings in (mathcal{N}=1) SQCD + SQED","authors":"O. V. Haneychuk,&nbsp;K. V. Stepanyantz","doi":"10.1140/epjc/s10052-025-14250-6","DOIUrl":"10.1140/epjc/s10052-025-14250-6","url":null,"abstract":"<div><p>We verify a recently derived equations relating the renormalization group running of two gauge couplings in <span>(mathcal{N}=1)</span> SQCD + SQED by the explicit three-loop calculation. It is demonstrated that these equations are really valid in the HD + MSL scheme. In other words, if a theory is regularized by higher covariant derivatives and the renormalization is made by minimal subtractions of logarithms, the analogs of the strong and electromagnetic gauge couplings do not run independently. However, in the <span>(overline{text{ DR }})</span> scheme the considered equations do not hold starting from the three-loop order, where the scheme dependence becomes essential. Therefore, they are valid only for a certain set of the renormalization prescriptions. We prove that all of them can be obtained from the HD + MSL scheme by finite renormalizations which satisfy a special constraint and illustrate how this works in the three-loop approximation.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14250-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144074082","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":"Generation of quantum entanglement in superposed diamond spacetime","authors":"Xiaofang Liu,&nbsp;Changjing Zeng,&nbsp;Jieci Wang","doi":"10.1140/epjc/s10052-025-14251-5","DOIUrl":"10.1140/epjc/s10052-025-14251-5","url":null,"abstract":"<div><p>A comprehensive study integrating the microscopic structure of spacetime and the principle of quantum superposition is capable of offering a fundamental bottom-up approach for understanding the quantum aspect of gravity. In this paper, we present a framework for the superposition of spacetime structures in the causal diamond spacetime and analyze the behavior of quantum entanglement generated by spacetime superposition from the perspective of relativistic quantum information. For the first time, we combine the concept of spacetime superposition with causal diamonds and derive the analytical expression of the Unruh-diamond vacuum state for Dirac fields in the causal diamond spacetime. Based on this, we analyze both initially correlated and uncorrelated modes in superposed and classical causal diamond spacetimes, and quantifying how quantum thermal effects arising from spacetime structure alter entanglement. Our findings reveal that quantum entanglement degrades in classical diamond spacetime, while the superposed structure generates additional entanglement resources between modes in superposed diamond spacetimes. From a quantum information perspective, our results suggest that the characteristics of spacetime structural manifestations can serve as valuable resources for performing quantum information processing tasks.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14251-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143949476","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}