The European Physical Journal C最新文献

{"title":"Impact of strong magnetic field, baryon chemical potential, and medium anisotropy on polarization and spin alignment of hadrons","authors":"Bhagyarathi Sahoo,&nbsp;Captain R. Singh,&nbsp;Raghunath Sahoo","doi":"10.1140/epjc/s10052-025-14260-4","DOIUrl":"10.1140/epjc/s10052-025-14260-4","url":null,"abstract":"<div><p>The recent observation of global spin polarization of <span>(Lambda )</span> (<span>(bar{Lambda })</span>) hyperons and the spin alignment of <span>(phi )</span> and <span>(K^{*0})</span> vector mesons create remarkable interest in investigating the particle polarization in the relativistic fluid produced in heavy-ion collisions at GeV/TeV energies. Among other sources of spin polarization phenomena, the Debye mass of a medium plays a crucial role in particle polarization. Any modification brought to the effective mass due to the temperature, strong magnetic field (<i>eB</i>), baryonic chemical potential (<span>(mu _{B})</span>), medium anisotropy (<span>(xi )</span>), and vorticity, etc., certainly affects the particle spin polarization. In this work, we explore the global hyperon spin polarization and the spin alignment of vector mesons corresponding to the strong magnetic field, baryonic chemical potential, and medium anisotropy. We find that the degree of spin polarization is flavor-dependent for hyperons. Meanwhile, vector meson spin alignment depends on the hadronization mechanisms of initially polarized quarks and anti-quarks. Medium anisotropy significantly changes the degree of spin polarization compared to the magnetic field and baryon chemical potential.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14260-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144140269","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":"Friedmann–Lemaître universes and their metamorphoses","authors":"Spiros Cotsakis","doi":"10.1140/epjc/s10052-025-14312-9","DOIUrl":"10.1140/epjc/s10052-025-14312-9","url":null,"abstract":"<div><p>We analyze the dynamics of the Friedmann–Lemaître universes taking into account the different roles played by the fluid parameter and the cosmological constant, as well as the degenerate character of the equations. We find that the Friedmann–Lemaître system reduces to four qualitatively inequivalent normal forms and write down the sets of all stable perturbations that may result (the ‘versal unfoldings’). These sets are of small codimension up to three. We then describe all possible parameter-dependent solutions and their transfigurations to other forms during evolution through the bifurcation sets, these are also fully described. This analysis leads to a picture of cosmological evolution determined by new parameters related to codimension which are zero in standard cosmology. The emerging versal solutions are all free of singularities, while other properties of them are also discussed.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14312-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144140270","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":"Circular motion, QPOs testing, emission energy and thermal fluctuations around a non-singular hairy Bardeen black hole","authors":"G. Mustafa,&nbsp;Allah Ditta,&nbsp;Tayyab Naseer,&nbsp;S. K. Maurya,&nbsp;Phongpichit Channuie,&nbsp;Awad A. Ibraheem,&nbsp;Farruh Atamurotov","doi":"10.1140/epjc/s10052-025-14235-5","DOIUrl":"10.1140/epjc/s10052-025-14235-5","url":null,"abstract":"<div><p>We investigate the dynamics of test particles around a spherically symmetric, non-rotating hairy-Bardeen black hole, and then study the influence of the model’s parameters on the particle motion. The black hole is fully characterized by five parameters, the mass <i>M</i> of the black hole, the charge <i>Q</i> of the black hole, coupling constant <span>(beta )</span>, the parameter <span>(gamma )</span> describing the hair of the black hole, and a BH parameter <span>(eta )</span>. Using the effective potential technique, we study the stability and instability of circular equatorial orbits. We calculate the analytical expressions for the energy and angular momentum of test particles as functions of black hole parameters. The effective forces acting on particles as well as the innermost stable circular orbits have also been studied. Epicyclic oscillations of test particles close to the equatorial plane are explored, and analytical expressions for radial, vertical, and orbital frequencies have been derived. We also investigated the frequency of periastron precession of the particles. We also study the thermal properties showing the emission rate of energy and thermal fluctuation by calculating the Hawking temperature. Our findings reveal that the black hole model’s parameters significantly impact particle motion.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14235-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135506","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":"Beam test studies for a SiPM-based RICH detector prototype for the future ALICE 3 experiment","authors":"A. R. Altamura,&nbsp;L. Congedo,&nbsp;G. De Robertis,&nbsp;D. Di Bari,&nbsp;A. Di Mauro,&nbsp;M. Giliberti,&nbsp;J. O. Guerra-Pulido,&nbsp;F. Licciulli,&nbsp;L. Lorusso,&nbsp;P. Martinengo,&nbsp;M. N. Mazziotta,&nbsp;E. Nappi,&nbsp;N. Nicassio,&nbsp;G. Paić,&nbsp;G. Panzarini,&nbsp;R. Pillera,&nbsp;G. Volpe","doi":"10.1140/epjc/s10052-025-14287-7","DOIUrl":"10.1140/epjc/s10052-025-14287-7","url":null,"abstract":"<div><p>The ALICE Collaboration is proposing a completely new apparatus, ALICE 3, for the LHC Runs 5 and beyond. In this context, a key subsystem for high-energy charged particle identification will be a proximity-focusing ring-imaging Cherenkov detector using aerogel as radiator and silicon photomultipliers (SiPMs) as photon sensors. We assembled a small-scale prototype instrumented with Hamamatsu S13352 and S13361-3075AE-08 SiPM arrays, readout by custom boards equipped with front-end Petiroc 2A ASICs. The Cherenkov radiator consisted of a 2 cm thick hydrophobic aerogel tile with a refractive index of 1.03 separated from the SiPM plane by a 23 cm expansion gap. The prototype was successfully tested in a campaign at the CERN PS T10 beam line with the goal of validating the design bRICH specifications in terms to achieve the target separation power. We measured a single photon angular resolution of 3.8 mrad at the Cherenkov angle saturation value of 242 mrad, as well as the expected scaling of the angular resolution with the increasing number of detected photons. We also studied the contribution of uncorrelated and correlated background sources with respect to the signal and proved the effectiveness of time matching between charged tracks and photon hits to achieve efficient suppression of the SiPM dark count rate background. In this paper, the detector concept, the description of the tested prototype layout and the main beam test results are reported.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14287-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144140249","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":"Improved and automated krypton assay for low-background xenon detectors with Auto-RGMS","authors":"Matteo Guida,&nbsp;Ying-Ting Lin,&nbsp;Hardy Simgen","doi":"10.1140/epjc/s10052-025-14262-2","DOIUrl":"10.1140/epjc/s10052-025-14262-2","url":null,"abstract":"<div><p>Ultra-sensitive quantification of trace radioactive krypton-85 (<span>(^{85})</span>Kr) is essential for low-background experiments, particularly for next-generation searches of galactic dark matter and neutrino physics using xenon-based time projection chambers (TPCs). While the rare gas mass spectrometer (RGMS) represents the current state-of-the-art for krypton detection in the field, we are developing a fully automated system (Auto-RGMS) to overcome the limitations of its manual operation. Auto-RGMS incorporates a robust control system for rapid measurements and minimized systematic uncertainties. A primary goal is to reach detection limits in the low parts-per-quadrillion (ppq) range for natural krypton by improving the chromatography stage to enhance the separation of krypton from xenon. Investigations into various adsorbent materials identified two candidates. HayeSep Q offers a 12-fold improvement in chromatographic resolution for xenon/krypton separation compared to the previously used adsorbent. Alternatively, HayeSep D provides a more limited improvement in resolution while allowing a higher measurement frequency because of its moderate retention-induced contamination after each measurement. By automating krypton assays and achieving ppq sensitivity, Auto-RGMS will be an indispensable tool for next-generation detectors, maximizing their scientific potential.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14262-2.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144140250","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":"Twisted Baker–Akhiezer function from determinants","authors":"A. Mironov,&nbsp;A. Morozov,&nbsp;A. Popolitov","doi":"10.1140/epjc/s10052-025-14297-5","DOIUrl":"10.1140/epjc/s10052-025-14297-5","url":null,"abstract":"<div><p>General description of eigenfunctions of integrable Hamiltonians associated with the integer rays of Ding–Iohara–Miki (DIM) algebra, is provided by the theory of Chalykh Baker–Akhiezer functions (BAF) defined as solutions to a simply looking linear system. Solutions themselves are somewhat complicated, but much simpler than they could. It is because of simultaneous partial factorization of all the determinants, entering Cramer’s rule. This is a conspiracy responsible for a relative simplicity of the Macdonald polynomials and of the Noumi–Shirashi functions, and it is further continued to all integer DIM rays. Still, factorization is only partial, moreover, there are different branches and abrupt jumps between them. We explain this feature of Cramer’s rule in an example of a matrix that defines BAF and exhibits a non-analytical dependence on parameters. Moreover, the matrix is such that there is no natural expansion around non-degenerate approximations, which causes an unexpected complexity of formulas.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14297-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135509","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 joint analysis of strong lensing and type Ia supernovae to determine the Hubble constant","authors":"L. R. Colaço,&nbsp;R. F. L. Holanda,&nbsp;Z. C. Santana,&nbsp;R. Silva","doi":"10.1140/epjc/s10052-025-14315-6","DOIUrl":"10.1140/epjc/s10052-025-14315-6","url":null,"abstract":"<div><p>We present a cosmological model-independent determination of the Hubble constant, <span>(H_0)</span>, by combining time-delay measurements from seven TDCOSMO systems, Einstein radius measurements, and type Ia supernovae data sourced from the Pantheon+ sample. For each lens of time-delay system, we calculate the angular diameter distance <span>(D_{A_l})</span> using the product <span>(D^{text {Obs}}(z_l) cdot D_{A,Delta t}^{text {Obs}}(z_l, z_s))</span>, where <span>(D^{text {Obs}}(z_l))</span> is reconstructed via Gaussian Processes from 99 Einstein radius measurements, and <span>(D_{A,Delta t}^{text {Obs}}(z_l,z_s))</span> is the time-delay angular distance. We also reconstruct the unanchored luminosity distance <span>(H_0 D_L(z_l))</span> from supernova data. By using the cosmic distance duality relation validity, we anchor <span>(D_{A_l})</span> and <span>(H_0 D_L(z_l))</span> to infer <span>(H_0 = 70.55 pm 7.44)</span> km/s/Mpc (68% CL). Our result, though not resolving the Hubble tension, offers a cosmological model-independent consistency check and highlights the potential of using strong lensing and supernovae data via the cosmic distance duality relation to constrain <span>(H_0)</span>.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14315-6.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144140199","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":"Search for (tbar{t}H/A rightarrow tbar{t}tbar{t}) production in proton–proton collisions at (sqrt{s}=13) (text {TeV}) with the ATLAS detector","authors":"ATLAS Collaboration","doi":"10.1140/epjc/s10052-025-14041-z","DOIUrl":"10.1140/epjc/s10052-025-14041-z","url":null,"abstract":"<div><p>A search is presented for a heavy scalar (<i>H</i>) or pseudo-scalar (<i>A</i>) predicted by the two-Higgs-doublet models, where the <i>H</i>/<i>A</i> is produced in association with a top-quark pair <span>((tbar{t}H/A),)</span> and with the <i>H</i>/<i>A</i> decaying into a <span>(tbar{t})</span> pair. The full LHC Run 2 proton–proton collision data collected by the ATLAS experiment is used, corresponding to an integrated luminosity of <span>(139~text {fb}^{-1}.)</span> Events are selected requiring exactly one or two opposite-charge electrons or muons. Data-driven corrections are applied to improve the modelling of the <span>(tbar{t})</span>+jets background in the regime with high jet and <i>b</i>-jet multiplicities. These include a novel multi-dimensional kinematic reweighting based on a neural network trained using data and simulations. An <i>H</i>/<i>A</i>-mass parameterised graph neural network is trained to optimise the signal-to-background discrimination. In combination with the previous search performed by the ATLAS Collaboration in the multilepton final state, the observed upper limits on the <span>(tbar{t}H/A rightarrow tbar{t}tbar{t})</span> production cross-section at 95% confidence level range between 14 fb and 5.0 fb for an <i>H</i>/<i>A</i> with mass between 400 <span>(text {GeV})</span> and 1000 <span>(text {GeV})</span>, respectively. Assuming that both the <i>H</i> and <i>A</i> contribute to the <span>(tbar{t}tbar{t})</span> cross-section, <span>(tan beta )</span> values below 1.7 or 0.7 are excluded for a mass of 400 <span>(text {GeV})</span> or 1000 <span>(text {GeV})</span>, respectively. The results are also used to constrain a model predicting the pair production of a colour-octet scalar, with the scalar decaying into a <span>(tbar{t})</span> pair.</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14041-z.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135510","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":"Quantum entropy-driven modifications to holographic dark energy in f(G, T) gravity","authors":"Giuseppe Gaetano Luciano","doi":"10.1140/epjc/s10052-025-14272-0","DOIUrl":"10.1140/epjc/s10052-025-14272-0","url":null,"abstract":"<div><p>In this work, we present a <i>f</i>(<i>G</i>, <i>T</i>) gravity-based reconstruction of Barrow Holographic Dark Energy (BHDE). This approach extends the conventional HDE model by replacing the standard Bekenstein–Hawking entropy with Barrow entropy, which encapsulates quantum gravitational corrections to the geometry of black hole horizons. We explore the cosmological dynamics of a spatially flat Friedmann–Robertson–Walker background filled with a pressureless dust fluid, considering both conserved and non-conserved energy–momentum tensor models. To this end, we employ the Hubble horizon as the infrared cutoff and adopt a power-law ansatz for the scale factor. We then investigate the evolution of key cosmological parameters, including the equation-of-state parameter <span>( omega _{GT} ,)</span> the deceleration parameter <i>q</i>,  and the squared sound speed <span>( v_s^2 .)</span> Furthermore, we explore the dynamical behavior in the <span>( omega _{GT} )</span>-<span>( omega '_{GT} )</span> phase space. In the case of conserved energy–momentum tensor, our findings indicate that the BHDE model evolves from a quintessence-like regime into the phantom domain. This transition supports the current accelerated expansion of the Universe and offers an improvement over the original HDE model, which does not adequately account for the observed phenomenology. The corresponding <span>( omega _{GT} )</span>-<span>( omega '_{GT} )</span> trajectory lies within the freezing region of the phase space. On the other hand, within the non-conserved framework, the BHDE model exhibits phantom-like behavior in the early Universe, subsequently evolving toward either a cosmological constant-like state or a quintessence-like regime. Notably, unlike the conserved scenario, the squared sound speed <span>( v_s^2 )</span> asymptotically attains positive values in the far future, signifying a stable configuration. Moreover, the trajectory in the <span>( omega _{GT} )</span>-<span>( omega '_{GT} )</span> phase space displays a thawing behavior. Finally, we evaluate the observational viability of our results and compare them with predictions from alternative reconstructed dark energy models.\u0000\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14272-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135345","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":"Search for hadronic decays of feebly-interacting particles at NA62","authors":"E. Cortina Gil,&nbsp;J. Jerhot,&nbsp;N. Lurkin,&nbsp;T. Numao,&nbsp;B. Velghe,&nbsp;V. W. S. Wong,&nbsp;D. Bryman,&nbsp;Z. Hives,&nbsp;T. Husek,&nbsp;K. Kampf,&nbsp;M. Kolesar,&nbsp;M. Koval,&nbsp;B. De Martino,&nbsp;M. Perrin-Terrin,&nbsp;L. Petit,&nbsp;B. Döbrich,&nbsp;S. Lezki,&nbsp;J. Schubert,&nbsp;A. T. Akmete,&nbsp;R. Aliberti,&nbsp;M. Ceoletta,&nbsp;L. Di Lella,&nbsp;N. Doble,&nbsp;L. Peruzzo,&nbsp;C. Polivka,&nbsp;S. Schuchmann,&nbsp;H. Wahl,&nbsp;R. Wanke,&nbsp;P. Dalpiaz,&nbsp;R. Negrello,&nbsp;I. Neri,&nbsp;F. Petrucci,&nbsp;M. Soldani,&nbsp;L. Bandiera,&nbsp;N. Canale,&nbsp;A. Cotta Ramusino,&nbsp;A. Gianoli,&nbsp;M. Romagnoni,&nbsp;A. Sytov,&nbsp;M. Lenti,&nbsp;P. Lo Chiatto,&nbsp;I. Panichi,&nbsp;G. Ruggiero,&nbsp;A. Bizzeti,&nbsp;F. Bucci,&nbsp;A. Antonelli,&nbsp;V. Kozhuharov,&nbsp;G. Lanfranchi,&nbsp;S. Martellotti,&nbsp;M. Moulson,&nbsp;T. Spadaro,&nbsp;G. Tinti,&nbsp;F. Ambrosino,&nbsp;M. D’Errico,&nbsp;R. Fiorenza,&nbsp;M. Francesconi,&nbsp;R. Giordano,&nbsp;P. Massarotti,&nbsp;M. Mirra,&nbsp;M. Napolitano,&nbsp;I. Rosa,&nbsp;G. Saracino,&nbsp;G. Anzivino,&nbsp;P. Cenci,&nbsp;V. Duk,&nbsp;R. Lollini,&nbsp;P. Lubrano,&nbsp;M. Pepe,&nbsp;M. Piccini,&nbsp;F. Costantini,&nbsp;M. Giorgi,&nbsp;S. Giudici,&nbsp;G. Lamanna,&nbsp;E. Lari,&nbsp;E. Pedreschi,&nbsp;J. Pinzino,&nbsp;M. Sozzi,&nbsp;R. Fantechi,&nbsp;F. Spinella,&nbsp;I. Mannelli,&nbsp;M. Raggi,&nbsp;A. Biagioni,&nbsp;P. Cretaro,&nbsp;O. Frezza,&nbsp;A. Lonardo,&nbsp;M. Turisini,&nbsp;P. Vicini,&nbsp;R. Ammendola,&nbsp;V. Bonaiuto,&nbsp;A. Fucci,&nbsp;A. Salamon,&nbsp;F. Sargeni,&nbsp;R. Arcidiacono,&nbsp;B. Bloch-Devaux,&nbsp;E. Menichetti,&nbsp;E. Migliore,&nbsp;C. Biino,&nbsp;A. Filippi,&nbsp;F. Marchetto,&nbsp;D. Soldi,&nbsp;Y. Mukhamejanov,&nbsp;A. Mukhamejanova,&nbsp;N. Saduyev,&nbsp;S. Sakhiyev,&nbsp;A. Briano Olvera,&nbsp;J. Engelfried,&nbsp;N. Estrada-Tristan,&nbsp;R. Piandani,&nbsp;M. A. Reyes Santos,&nbsp;K. A. Rodriguez Rivera,&nbsp;P. Boboc,&nbsp;A. M. Bragadireanu,&nbsp;S. A. Ghinescu,&nbsp;O. E. Hutanu,&nbsp;T. Blazek,&nbsp;V. Cerny,&nbsp;T. Velas,&nbsp;R. Volpe,&nbsp;J. Bernhard,&nbsp;L. Bician,&nbsp;M. Boretto,&nbsp;F. Brizioli,&nbsp;A. Ceccucci,&nbsp;M. Corvino,&nbsp;H. Danielsson,&nbsp;F. Duval,&nbsp;L. Federici,&nbsp;E. Gamberini,&nbsp;R. Guida,&nbsp;E. B. Holzer,&nbsp;B. Jenninger,&nbsp;Z. Kucerova,&nbsp;G. Lehmann Miotto,&nbsp;P. Lichard,&nbsp;K. Massri,&nbsp;E. Minucci,&nbsp;M. Noy,&nbsp;V. Ryjov,&nbsp;J. Swallow,&nbsp;M. Zamkovsky,&nbsp;X. Chang,&nbsp;A. Kleimenova,&nbsp;R. Marchevski,&nbsp;J. R. Fry,&nbsp;F. Gonnella,&nbsp;E. Goudzovski,&nbsp;J. Henshaw,&nbsp;C. Kenworthy,&nbsp;C. Lazzeroni,&nbsp;C. Parkinson,&nbsp;A. Romano,&nbsp;C. Sam,&nbsp;J. Sanders,&nbsp;A. Sergi,&nbsp;A. Shaikhiev,&nbsp;A. Tomczak,&nbsp;H. Heath,&nbsp;D. Britton,&nbsp;A. Norton,&nbsp;D. Protopopescu,&nbsp;J. B. Dainton,&nbsp;L. Gatignon,&nbsp;R. W. L. Jones,&nbsp;P. Cooper,&nbsp;D. Coward,&nbsp;P. Rubin,&nbsp;A. Baeva,&nbsp;D. Baigarashev,&nbsp;V. Bautin,&nbsp;D. Emelyanov,&nbsp;T. Enik,&nbsp;V. Falaleev,&nbsp;V. Kekelidze,&nbsp;D. Kereibay,&nbsp;A. Korotkova,&nbsp;L. Litov,&nbsp;D. Madigozhin,&nbsp;M. Misheva,&nbsp;N. Molokanova,&nbsp;I. Polenkevich,&nbsp;Yu. Potrebenikov,&nbsp;K. Salamatin,&nbsp;S. Shkarovskiy,&nbsp;S. Fedotov,&nbsp;K. Gorshanov,&nbsp;E. Gushchin,&nbsp;S. Kholodenko,&nbsp;A. Khotyantsev,&nbsp;Y. Kudenko,&nbsp;V. Kurochka,&nbsp;V. Kurshetsov,&nbsp;A. Mefodev,&nbsp;V. Obraztsov,&nbsp;A. Okhotnikov,&nbsp;A. Sadovskiy,&nbsp;V. Sugonyaev,&nbsp;O. Yushchenko,&nbsp;NA62 Collaboration","doi":"10.1140/epjc/s10052-025-14133-w","DOIUrl":"10.1140/epjc/s10052-025-14133-w","url":null,"abstract":"<div><p>The NA62 experiment at CERN has the capability to collect data in a beam-dump mode, where 400 GeV protons are dumped on an absorber. In this configuration, New Physics particles, including dark photons, dark scalars, and axion-like particles, may be produced in the absorber and decay in the instrumented volume beginning approximately 80 m downstream of the dump. A search for these particles decaying in flight to hadronic final states is reported, based on an analysis of a sample of <span>(1.4 times 10^{17})</span> protons on dump collected in 2021. No evidence of a New Physics signal is observed, excluding new regions of parameter spaces of multiple models.\u0000\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 5","pages":""},"PeriodicalIF":4.2,"publicationDate":"2025-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14133-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144131432","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}