The European Physical Journal C最新文献

{"title":"Measurement of K fluorescence analysis in ancient bone using X-ray transition edge sensor and semiconductor detectors","authors":"Zhi-Wei Li,&nbsp;Si-Ming Guo,&nbsp;Shuo Zhang,&nbsp;Jin-Jie Wu,&nbsp;Zhen Wang,&nbsp;Nan Li,&nbsp;Zhong-Tao Wang","doi":"10.1140/epjc/s10052-025-13845-3","DOIUrl":"10.1140/epjc/s10052-025-13845-3","url":null,"abstract":"<div><p>Transition edge sensor (TES) have high energy resolution, which can extremely improve in various scientific experiments the energy spectrum analysis capability and have a wide range of applications in almost all fields covering the whole wave band of electromagnetic waves. The same Chinese ancient human bone sample was measured by fluorescence analysis using SDD, Si-PIN detector and TES detector. Typical representative results among the measurements of the three detectors were selected for comparative analyses. The experimental results showed that the TES detector has obvious advantages compared with the semiconductor detector, with a resolution of 21.2eV@3.69 keV, compared to 115.8 eV @ 3.69 keV and 143.9 eV @ 3.69 for SDD and Si-PIN detectors, respectively. TES detector even found some spectral lines that cannot be measured by semiconductor detectors, such as the 0.916 keV L line of Cu, L line of 2.86 keV Rh and so on. The experimental results demonstrate the TES detector’s outstanding performance in elemental spectral line detection. Compared to observations with semiconductor detectors, using X-ray TES enables clear resolution of spectral lines corresponding to elements present in the sample.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13845-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143489418","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 scale-separated supersymmetric (hbox {AdS}_2) flux vacua","authors":"Niccolò Cribiori,&nbsp;Fotis Farakos,&nbsp;Nikolaos Liatsos","doi":"10.1140/epjc/s10052-025-13915-6","DOIUrl":"10.1140/epjc/s10052-025-13915-6","url":null,"abstract":"<div><p>We argue that scale-separated <span>(hbox {AdS}_2)</span> vacua with at least two preserved supercharges cannot arise from flux compactifications in a regime of computational control. We deduce this by showing that the <span>(hbox {AdS}_2)</span> scale is parametrically of the same order as the tension of a fundamental BPS domain wall, which provides an upper bound on the UV cutoff. Since the latter does not need to be associated to any geometric scale, the argument excludes scale separation in a broader sense than what commonly considered. Our claim is exemplified by a bottom-up 2D supergravity analysis as well as top-down models from Type II flux compactifications.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13915-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143489420","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 axion contribution to the two-photon decays of neutral pions","authors":"Zhen-Yan Lu,&nbsp;Yang Huang,&nbsp;Ji-Gui Cheng,&nbsp;Qi Lu,&nbsp;Shu-Peng Wang","doi":"10.1140/epjc/s10052-025-13906-7","DOIUrl":"10.1140/epjc/s10052-025-13906-7","url":null,"abstract":"<div><p>The presence of axions introduces new diagrams at one-loop order to the two-photon decays of the neutral pion through axion-pion mixing. In this work, we calculate this correction, missing in all current calculations, in the framework of SU(2) chiral perturbation theory. We show that the correction is proportional to the axion-photon coupling and the square of axion mass, which in turn is strongly suppressed by the axion decay constant for the classical space window but may not be negligible for the QCD axion in the MeV or even larger mass range. On the other hand, in combination with the experimental measurement of the decay width of <span>(pi ^0rightarrow gamma gamma )</span> process, this result rules out the standard QCD axion as an explanation for the possible discrepancy between the chiral perturbation theory prediction and the experimental data.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13906-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143475288","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":"Measurement of the associated production of a top-antitop-quark pair and a Higgs boson decaying into a (bbar{b}) pair in pp collisions at (sqrt{s}=13) TeV using the ATLAS detector at the LHC","authors":"ATLAS Collaboration","doi":"10.1140/epjc/s10052-025-13740-x","DOIUrl":"10.1140/epjc/s10052-025-13740-x","url":null,"abstract":"<div><p>This paper reports the measurement of Higgs boson production in association with a <span>(tbar{t})</span> pair in the <span>(Hrightarrow bbar{b})</span> decay channel. The analysis uses 140 fb<span>(^{-1})</span> of 13 <span>(text {TeV})</span> proton–proton collision data collected with the ATLAS detector at the Large Hadron Collider. The final states with one or two electrons or muons are employed. An excess of events over the expected background is found with an observed (expected) significance of 4.6 (5.4) standard deviations. The <span>(tbar{t}H)</span> cross-section is <span>(sigma _{tbar{t}H} = 411~^{+101}_{-92}~text {fb} = 411 pm 54(text {stat.})~^{+85}_{-75}(text {syst.})~text {fb})</span> for a Higgs boson mass of 125.09 <span>(text {GeV})</span>, consistent with the prediction of the Standard Model of <span>(507^{+35}_{-50})</span> fb. The cross-section is also measured differentially in bins of the Higgs boson transverse momentum within the simplified template cross-section framework.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13740-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143481227","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":"Vacuum energy in non-supersymmetric quasi-realistic heterotic-string vacua with fixed moduli","authors":"Eman Basaad,&nbsp;Luke A. Detraux,&nbsp;Alonzo R. Diaz Avalos,&nbsp;Alon E. Faraggi,&nbsp;Benjamin Percival","doi":"10.1140/epjc/s10052-024-13733-2","DOIUrl":"10.1140/epjc/s10052-024-13733-2","url":null,"abstract":"<div><p>Recently, Baykara et al. (The Quasicrystalline string landscape, 2024; New non-supersymmetric tachyon-free strings, 2024) discussed the existence of quasicrystalline string vacua that contain a single neutral moduli, the dilaton, and studied compactifications of the non-supersymmetric <span>(SO(16)times SO(16))</span> heterotic-string on these spaces. We discuss a specific class of quasi-realistic string vacua with similar properties that has been known since the late eighties and analyse the vacuum energy in several non-supersymmetric examples that correspond to compactifications of tachyon free ten dimensional vacua as well as compactifications of tachyonic ten dimensional vacua. Our analysis uses the Free Fermionic Formalism of the heterotic-string in four dimensions and employs asymmetric boundary conditions that project all the geometrical moduli by Generalised GSO projections. This methodology produces models with both positive and negative spacetime potential at one-loop.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-024-13733-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143481231","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 comprehensive study of particle dynamics, thermal fluctuations with Barrow entropy, and greybody factors of quantum-improved charged black holes","authors":"Ghulam Fatima,&nbsp;Tao Zhu,&nbsp;Faisal Javed,&nbsp;Arfa Waseem,&nbsp;G. Mustafa","doi":"10.1140/epjc/s10052-025-13914-7","DOIUrl":"10.1140/epjc/s10052-025-13914-7","url":null,"abstract":"<div><p>This study examines the characteristics and behavior of quantum-improved charged black holes, focusing on the relationships between mass, charge, and the quantum-improved parameter. We explore the consequences of these characteristics on the structure of a black hole’s horizon, particularly investigating the ways that variations in charge and mass modify the horizon radius and size of innermost stable circular orbits. A thorough thermodynamic analysis indicates substantial impacts on corrected energies, including Helmholtz free energy, enthalpy, internal energy, and Gibbs free energy, in the context of Barrow entropy, emphasizing stable and unstable configurations across various quantum correction parameter ranges. Additionally, we analyze wave behavior near the cosmic horizon and its correlation with effective potential, illustrating whether wave frequency influences the gravitational absorption function and the transmission properties of scalar fields near quantum-improved charged black holes. Our findings highlight the complex interaction between black hole dynamics and quantum parameters, facilitating a more profound comprehension of black hole thermodynamics and their significance in curved space-time quantum field theory.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13914-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143481232","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":"Publisher Erratum: Nonextensive black hole thermodynamics from generalized Euclidean path integral and Wick’s rotation","authors":"F. Barzi,&nbsp;H. El Moumni,&nbsp;K. Masmar","doi":"10.1140/epjc/s10052-025-13904-9","DOIUrl":"10.1140/epjc/s10052-025-13904-9","url":null,"abstract":"","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13904-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143481185","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":"Thermal fluctuation effects on shear viscosity to entropy ratio in five-dimensional Kerr–Newman black holes","authors":"Behnam Pourhassan,&nbsp;İzzet Sakallı,&nbsp;Aram Bahroz Brzo","doi":"10.1140/epjc/s10052-025-13893-9","DOIUrl":"10.1140/epjc/s10052-025-13893-9","url":null,"abstract":"<div><p>We investigate how thermal fluctuations affect the properties of five-dimensional Kerr–Newman black holes, focusing particularly on the shear viscosity to entropy ratio. Our analysis incorporates logarithmic corrections to the Bekenstein–Hawking entropy and examines their impact on black hole thermodynamics. We explore three approaches to studying the shear viscosity-entropy ratio in the presence of thermal fluctuations: considering independent shear viscosity, thermally corrected shear viscosity, and an independent ratio assumption. Notably, we find that the lower bound of <span>(eta /S ge 1/4pi )</span> remains valid even with thermal fluctuations, though the specific behavior depends on the black hole mass and correction parameter. Our results suggest that thermal fluctuations generally decrease the ratio for massive black holes while maintaining the universal lower bound. This work extends our understanding of quantum corrections to black hole transport properties.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13893-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143475141","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":"Weak decays of ({varvec{B}}_{{varvec{c}}}) involving vector mesons in self-consistent covariant light-front approach","authors":"Thejus Mary S.,&nbsp;Avijit Hazra,&nbsp;Neelesh Sharma,&nbsp;Rohit Dhir","doi":"10.1140/epjc/s10052-025-13783-0","DOIUrl":"10.1140/epjc/s10052-025-13783-0","url":null,"abstract":"<div><p>We present a comprehensive analysis of weak transition form factors, semileptonic decays, and nonleptonic decays of <span>(B_c)</span> mesons involving pseudoscalar (<i>P</i>) and vector (<i>V</i>) mesons for bottom-conserving and bottom-changing decay modes. We employ the self-consistent covariant light-front quark model (CLFQM), termed type-II correspondence, to calculate the <span>(B_c)</span> to <i>P</i>(<i>V</i>) transition form factors. The type-II correspondence in the CLF approach gives self-consistent results associated with the <span>(B^{(i)}_j)</span> functions, which vanish numerically after the replacement <span>(M^{prime (prime prime )} rightarrow M_0^{prime (prime prime )})</span> in traditional type-I correspondence, and the covariance of the matrix elements is also restored. We investigate these effects on bottom-conserving <span>(B_c)</span> to <i>P</i>(<i>V</i>) form factors that have not yet been studied in CLFQM type-II correspondence. In addition, we quantify the implications of self-consistency propagating to weak decays involving both bottom-conserving and bottom-changing <span>(B_c)</span> transition form factors. We use two different parameterizations, the usual three-parameter function of <span>(q^{2})</span> and the model-independent <i>z</i>-series expansion, to establish a clear understanding of <span>(q^{2})</span> dependence. Using the numerical values of the form factors, we predict the branching ratios other physical observables, including forward-backward asymmetries, polarization fractions, etc. of the semileptonic <span>(B_c)</span> decays. Subsequently, we predict the branching ratios of two-body nonleptonic weak decays using the factorization hypothesis in self-consistent CLFQM. We also compare our results with those of other theoretical studies.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13783-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143455601","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":"Generating a highly uniform magnetic field inside the magnetically shielded room of the n2EDM experiment","authors":"C. Abel,&nbsp;N. J. Ayres,&nbsp;G. Ban,&nbsp;G. Bison,&nbsp;K. Bodek,&nbsp;V. Bondar,&nbsp;T. Bouillaud,&nbsp;D. C. Bowles,&nbsp;G. L. Caratsch,&nbsp;E. Chanel,&nbsp;W. Chen,&nbsp;P.-J. Chiu,&nbsp;C. Crawford,&nbsp;B. Dechenaux,&nbsp;C. B. Doorenbos,&nbsp;S. Emmenegger,&nbsp;L. Ferraris-Bouchez,&nbsp;M. Fertl,&nbsp;P. Flaux,&nbsp;A. Fratangelo,&nbsp;D. Goupillière,&nbsp;W. C. Griffith,&nbsp;Z. Grujic,&nbsp;D. Höhl,&nbsp;M. Kasprzak,&nbsp;K. Kirch,&nbsp;V. Kletzl,&nbsp;S. V. Komposch,&nbsp;P. A. Koss,&nbsp;J. Krempel,&nbsp;B. Lauss,&nbsp;T. Lefort,&nbsp;A. Lejuez,&nbsp;R. Li,&nbsp;M. Meier,&nbsp;J. Menu,&nbsp;K. Michielsen,&nbsp;P. Mullan,&nbsp;A. Mullins,&nbsp;O. Naviliat-Cuncic,&nbsp;D. Pais,&nbsp;F. M. Piegsa,&nbsp;G. Pignol,&nbsp;G. Quemener,&nbsp;M. Rawlik,&nbsp;D. Rebreyend,&nbsp;I. Rienaecker,&nbsp;D. Ries,&nbsp;S. Roccia,&nbsp;D. Rozpedzik,&nbsp;A. Schnabel,&nbsp;P. Schmidt-Wellenburg,&nbsp;E. P. Segarra,&nbsp;N. Severijns,&nbsp;C. A. Smith,&nbsp;K. Svirina,&nbsp;R. Tavakoli,&nbsp;J. Thorne,&nbsp;S. Touati,&nbsp;J. Vankeirsbilck,&nbsp;R. Virot,&nbsp;J. Voigt,&nbsp;E. Wursten,&nbsp;N. Yazdandoost,&nbsp;J. Zejma,&nbsp;N. Ziehl,&nbsp;G. Zsigmond","doi":"10.1140/epjc/s10052-025-13902-x","DOIUrl":"10.1140/epjc/s10052-025-13902-x","url":null,"abstract":"<div><p>We present a coil system designed to generate a highly uniform magnetic field for the n2EDM experiment at the Paul Scherrer Institute. It consists of a main <span>(B_0)</span> coil and a set of auxiliary coils mounted on a cubic structure with a side length of <span>(273~hbox {cm})</span>, inside a large magnetically shielded room (MSR). We have assembled this system and characterized its performances with a mapping robot. The apparatus is able to generate a <span>(1~upmu hbox {T})</span> vertical field with a relative root mean square deviation <span>(sigma (B_z)/B_z = 3times 10^{-5})</span> over the volume of interest, a cylinder of radius <span>(40~hbox {cm})</span> and height <span>({30}~hbox {cm})</span>. This level of uniformity overcomes the n2EDM requirements, allowing a measurement of the neutron Electric Dipole Moment with a sensitivity better than <span>(1times 10^{-27}e,hbox {cm})</span>.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 2","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-13902-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143446619","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}