Publicaciones IFLP

Search for chargino-neutralino production using recursive jigsaw reconstruction in final states with two orpthree charged leptons in proton-proton collisions at √s = 13 TeV with the ATLAS detector

2026-06-05T20:38:25Z

Articulo Physical Review D; vol. 98, no. 9 A search for electroweak production of supersymmetric particles is performed in two-lepton and three- lepton final states using recursive jigsaw reconstruction, a technique that assigns reconstructed objects to the most probable hemispheres of the decay trees, allowing one to construct tailored kinematic variables to separate the signal and background. The search uses data collected in 2015 and 2016 by the ATLAS experiment in √s = 13 TeV proton-proton collisions at the CERN Large Hadron Collider corresponding to an integrated luminosity of 36.1 fb⁻¹. Chargino-neutralino pair production, with decays via W=Z bosons, is studied in final states involving leptons and jets and missing transverse momentum for scenarios with large and intermediate mass splittings between the parent particle and lightest supersymmetric particle, as well as for the scenario where this mass splitting is close to the mass of the Z boson. The latter case is challenging since the vector bosons are produced with kinematic properties that are similar to those in Standard Model processes. Results are found to be compatible with the Standard Model expectations in the signal regions targeting large and intermediate mass splittings, and chargino-neutralino masses up to 600 GeV are excluded at 95% confidence level for a massless lightest supersymmetric particle. Excesses of data above the expected background are found in the signal regions targeting low mass splittings, and the largest local excess amounts to 3.0 standard deviations. La lista completa de autores que integran el documento puede consultarse en el archivo.

Search for Higgs bosons produced via vector-boson fusion and decaying into bottom quark pairs √s = 13 TeV pp collisions with the ATLAS detector

2026-06-05T20:38:26Z

Articulo Physical Review D; vol. 98, no. 5 A search for the bb̄ decay of the Standard Model Higgs boson produced through vector-boson fusion is presented. Three mutually exclusive channels are considered: two all-hadronic channels and a photon- associated channel. Results are reported from the analysis of up to 30.6 fb⁻¹ of pp data at √s = 13 13 TeV collected with the ATLAS detector at the LHC. The measured signal strength relative to the Standard þ1.7 Model prediction from the combined analysis is 2.5 +1.4 −1.3 for inclusive Higgs boson production and 3.0 +1.7−1.6 for vector-boson fusion production only. La lista completa de autores que integran el documento puede consultarse en el archivo.

Development of a Cost-Effective Magnetic Microparticle Protocol for DNA Purification in Molecular Diagnosis of Gynecological Infections

2026-06-04T20:43:02Z

Articulo Magnetochemistry; vol. 12, no. 2 In this work, we evaluate the efficiency of a DNA purification protocol from gynecological samples using locally synthesized Fe3 O4 @SiO2 magnetic microparticles and a low-cost, guanidinium thiocyanate (GITC)-free lysis buffer. The microparticles were characterized by SEM, EDS, FTIR, and magnetic measurements, confirming the formation of compact silica- coated aggregates with suitable magnetic responsiveness for rapid and complete capture. Using this material in combination with a simple, GITC-free lysis buffer, we achieved DNA extraction yields comparable to those obtained with standard methods based on chaotropic salts. The purified DNA showed high compatibility with molecular assays for the detection of Chlamydia trachomatis, Ureaplasma urealyticum, Mycoplasma hominis, and human papilloma virus. Clinical validation demonstrated excellent diagnostic performance, with only a few discrepancies observed in samples near the detection threshold of qPCR, a limitation shared with commercial kits. Overall, the method represents a low-cost, safe, and sustainable alternative for routine clinical and epidemiological applications, compared to methods based on chaotropic salt buffers. Furthermore, it reduces reliance on imported commercial consumables and minimizes the handling of hazardous reagents.

Measurement of jet fragmentation in Pb+Pb and pp collisions at √sNN = 5.02 TeV with the ATLAS detector

2026-06-03T20:30:30Z

Articulo Physical Review C; vol. 98, no. 4 This paper presents a measurement of jet fragmentation functions in 0.49 nb⁻¹ of Pb+Pb collisions and 25 pb⁻¹ of pp collisions at √ sNN = 5.02 TeV collected in 2015 with the ATLAS detector at the LHC. These measurements provide insight into the jet quenching process in the quark-gluon plasma created in the aftermath of ultrarelativistic collisions between two nuclei. The modifications to the jet fragmentation functions are quantified by dividing the measurements in Pb+Pb collisions by baseline measurements in pp collisions. This ratio is studied as a function of the transverse momentum of the jet, the jet rapidity, and the centrality of the collision. In both collision systems, the jet fragmentation functions are measured for jets with transverse momentum between 126 and 398 GeV and with an absolute value of jet rapidity less than 2.1. An enhancement of particles carrying a small fraction of the jet momentum is observed, which increases with centrality and with increasing jet transverse momentum. Yields of particles carrying a very large fraction of the jet momentum are also observed to be enhanced. Between these two enhancements of the fragmentation functions a suppression of particles carrying an intermediate fraction of the jet momentum is observed in Pb+Pb collisions. A small dependence of the modifications on jet rapidity is observed. La lista completa de autores que integran el documento puede consultarse en el archivo.

Measurement of the suppression and azimuthal anisotropy of muons from heavy-flavor decays in Pb+Pb collisions at √𝑠𝑁⁢𝑁=2.76 TeV with the ATLAS detector

2026-06-03T20:30:32Z

Articulo Physical Review C; vol. 98, no. 4 ATLAS measurements of the production of muons from heavy-flavor decays in √ sNN = 2.76 TeV Pb+Pb collisions and √ s = 2.76 TeV pp collisions at the LHC are presented. Integrated luminosities of 0.14 nb⁻¹ and 570 nb⁻¹ are used for the Pb+Pb and pp measurements, respectively, which are performed over the muon transverse momentum range 4 < pT < 14 GeV and for five Pb+Pb centrality intervals. Backgrounds arising from in-flight pion and kaon decays, hadronic showers, and misreconstructed muons are statistically removed using a template-fitting procedure. The heavy-flavor muon differential cross sections and per-event yields are measured in pp and Pb+Pb collisions, respectively. The nuclear modification factor RAA obtained from these is observed to be independent of pT , within uncertainties, and to be less than unity, which indicates suppressed production of heavy-flavor muons in Pb+Pb collisions. For the 10% most central Pb+Pb events, the measured RAA is approximately 0.35. The azimuthal modulation of the heavy-flavor muon yields is also measured and the associated Fourier coefficients vn for n = 2, 3, and 4 are given as a function of pT and centrality. They vary slowly with pT and show a systematic variation with centrality which is characteristic of other anisotropy measurements, such as that observed for inclusive hadrons. The measured RAA and vn values are also compared with theoretical calculations. La lista completa de autores que integran el documento puede consultarse en el archivo.

Search for heavy resonances decaying to a photon and a hadronically decaying Z/W/H boson in pp collisions at √s=13 TeV with the ATLAS detector

2026-06-03T20:30:33Z

Articulo Physical Review D; vol. 98, no. 3 Many extensions of the Standard Model predict new resonances decaying to a Z, W, or Higgs boson and a photon. This paper presents a search for such resonances produced in pp collisions at √s=13 TeV using a data set with an integrated luminosity of 36.1 fb−1 collected by the ATLAS detector at the LHC. The Z=W=H bosons are identified through their decays to hadrons. The data are found to be consistent with the Standard Model expectation in the entire investigated mass range. Upper limits are set on the production cross section times branching fraction for resonance decays to Z = W + γ in the mass range from 1.0 to 6.8 TeV and for the first time into H + γ in the mass range from 1.0 to 3.0 TeV.

Search for supersymmetry in final states with charm jets and missing transverse momentum in 13 TeV pp collisions with the ATLAS detector

2026-06-03T20:30:34Z

Articulo Journal of High Energy Physics; vol. 2018 A search for supersymmetric partners of top quarks decaying as t ~ 1 → c χ ~ 1 0 and supersymmetric partners of charm quarks decaying as c ~ 1 → c χ ~ 1 0, where χ ~ 1 0 is the lightest neutralino, is presented. The search uses 36.1 fb⁻¹ of pp collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS experiment at the Large Hadron Collider and is performed in final states with jets identified as containing charm hadrons. Assuming a 100% branching ratio to c χ ~ 1 0, top and charm squarks with masses up to 850 GeV are excluded at 95% confidence level for a massless lightest neutralino. For m t ~ 1, c ~ 1 − m χ ~ 10 <100 GeV, top and charm squark masses up to 500 GeV are excluded. La lista completa de autores que integran el documento puede consultarse en el archivo.

Search for lepton-flavor-violating decays of the Z boson into a τ lepton and a light lepton with the ATLAS detector

2026-06-03T20:30:36Z

Articulo Physical Review D; vol. 98, no. 9 Direct searches for lepton flavor violation in decays of the Z boson with the ATLAS detector at the LHC are presented. Decays of the Z boson into an electron or muon and a hadronically decaying τ lepton are considered. The searches are based on a data sample of proton-proton collisions collected by the ATLAS detector in 2015 and 2016, corresponding to an integrated luminosity of 36.1 fb−1 at a center-of-mass energy of √s=13 TeV. No statistically significant excess of events above the expected background is observed, and upper limits on the branching ratios of lepton-flavor-violating decays are set at the 95% confidence level: 𝓑(Z → eτ) < 5.8 × 10−5 and 𝓑(Z → μτ) < 2.4 × 10−5. This is the first limit on 𝓑(Z → eτ) with ATLAS data. The upper limit on 𝓑(Z → μτ) is combined with a previous ATLAS result based on 20.3 fb−1 of proton-proton collision data at a center-of-mass energy of √s= 8 TeV and the combined upper limit at 95% confidence level is 𝓑(Z → μτ) < 1.3 × 10−5. La lista completa de autores que integran el documento puede consultarse en el archivo.

Search for supersymmetry in events with four or more leptons in √s=13 TeV pp collisions with ATLAS

2026-06-04T04:27:43Z

Articulo Physical Review D; vol. 98, no. 3 Results from a search for supersymmetry in events with four or more charged leptons (electrons, muons and taus) are presented. The analysis uses a data sample corresponding to 36.1 fb−1 of proton–proton collisions delivered by the Large Hadron Collider at √s = 13 TeV and recorded by the ATLAS detector. Four-lepton signal regions with up to two hadronically decaying taus are designed to target a range of supersymmetric scenarios that can be either enriched in or depleted of events involving the production and decay of a Z boson. Data yields are consistent with Standard Model expectations and results are used to set upper limits on the event yields from processes beyond the Standard Model. Exclusion limits are set at the 95% confidence level in simplified models of general gauge mediated supersymmetry, where Higgsino masses are excluded up to 295 GeV. In R-parity-violating simplified models with decays of the lightest supersymmetric particle to charged leptons, lower limits of 1.46, 1.06, and 2.25 TeV are placed on wino, slepton and gluino masses, respectively. La lista completa de autores que integran el documento puede consultarse en el archivo.

Large-scale Cosmic-Ray Anisotropies above 4 EeV Measured by the Pierre Auger Observatory

2026-05-29T20:24:15Z

Preprint The Astrophysical Journal; vol. 868, no. 1 We present a detailed study of the large-scale anisotropies of cosmic rays with energies above 4 EeV measured using the Pierre Auger Observatory. For the energy bins [4, 8] EeV and E ≥ 8 EeV, the most significant signal is a dipolar modulation in right ascension at energies above 8 EeV, as previously reported. In this paper we further scrutinize the highest-energy bin by splitting it into three energy ranges. We find that the amplitude of the dipole increases with energy above 4 EeV. The growth can be fitted with a power law with index β = 0.79 ± 0.19. The directions of the dipoles are consistent with an extragalactic origin of these anisotropies at all the energies considered. Additionally we have estimated the quadrupolar components of the anisotropy: they are not statistically significant. We discuss the results in the context of the predictions from different models for the distribution of ultrahigh-energy sources and cosmic magnetic fields.

Ultra-High Energy Cosmic Rays

2026-05-29T20:24:16Z

Objeto de conferencia Latin-American School of High-Energy Physics (Arequipa, Peru, 6 al 19 de marzo de 2013) The origin of the ultra high energy cosmic rays (UHECR) with energies above E > 1017 eV, is still unknown. The discovery of their sources will reveal the engines of the most energetic astrophysical accelerators in the universe. This is a written version of a series of lectures devoted to UHECR at the 2013 CERN-Latin-American School of High-Energy Physics. We present an intro- duction to acceleration mechanisms of charged particles to the highest ener- gies in astrophysical objects, their propagation from the sources to Earth, and the experimental techniques for their detection. We also discuss some of the relevant observational results from Telescope Array and Pierre Auger Obser- vatory. These experiments deal with particle interactions at energies orders of magnitude higher than achieved in terrestrial accelerators.

Search for pair production of heavy vectorlike quarks decaying into hadronic final states in pp collisions at √s = 13 TeV with the ATLAS detector

2026-05-18T20:22:07Z

Articulo Physical Review D; vol. 98, no. 9 A search is presented for the pair production of heavy vectorlike quarks, TT̄ or BB̄, that decay into final states with jets and no reconstructed leptons. Jets in the final state are classified using a deep neural network as arising from hadronically decaying W=Z bosons, Higgs bosons, top quarks, or background. The analysis uses data from the ATLAS experiment corresponding to 36.1 fb−1 of proton-proton collisions with a center-of-mass energy of √s = 13 TeV delivered by the Large Hadron Collider in 2015 and 2016. No significant deviation from the Standard Model expectation is observed. Results are interpreted assuming the vectorlike quarks decay into a Standard Model boson and a third-generation-quark, T → Wb, Ht, Zt or B → Wt, Hb, Zb, for a variety of branching ratios. At 95% confidence level, the observed (expected) lower limit on the vectorlike B-quark mass for a weak-isospin doublet (B, Y) is 950 (890) GeV, and the lower limits on the masses for the pure decays B → Hb and T → Ht, where these results are strongest, are 1010 (970) GeV and 1010 (1010) GeV, respectively. La lista completa de autores que integran el documento puede consultarse en el archivo.

Diseño de celdas solares de perovskita para aplicaciones sustentables mediante DFT y simulación

2026-05-11T20:21:44Z

Articulo Design of perovskite solar cells for sustainable applications using DFT and simulation XLI Congreso Argentino de Mecánica Computacional( Buenos Aires, 11 al 14 de noviembre de 2025); Mecánica Computacional; vol. 42, no. 14 Las celdas solares de perovskita han alcanzado eﬁciencias superiores al 26 por ciento en una década, consolidándose como una alternativa a las tecnologías fotovoltaicas convencionales. Sin embargo, la inestabilidad y la toxicidad asociadas al plomo limitan su aplicación. En este trabajo se es- tudian compuestos inorgánicos de cesio, bromo y yodo con sustituciones parciales de plomo por estaño o germanio, orientados a reducir el contenido de plomo. Las propiedades estructurales y electrónicas se calcularon mediante teoría del funcional de la densidad, mostrando buena concordancia con resulta- dos experimentales. El desempeño fotovoltaico de arquitecturas tipo n–i–p se evaluó con el programa SCAPS-1D, considerando óxido de titanio y yoduro de cobre como capas de transporte de electrones y huecos, respectivamente. Las composiciones con hasta un 25 por ciento de plomo alcanzaron eﬁciencias cercanas al 15 por ciento, destacándose las basadas en estaño sobre las de germanio. Este enfoque inte- gra diseño de materiales y simulación para el desarrollo de celdas solares de perovskita más estables y sostenibles.; Perovskite solar cells have achieved efﬁciencies above 26 percent within a decade, establishing themselves as a promising alternative to conventional photovoltaic technologies. However, instability and lead toxicity still limit their application. This work investigates inorganic cesium, bromine, and io- dine compounds with partial substitution of lead by tin or germanium, aiming to reduce the lead content. Structural and electronic properties were calculated using density functional theory, showing good agree- ment with experimental results. The photovoltaic performance of n–i–p architectures was evaluated with SCAPS-1D, considering titanium oxide and copper iodide as electron and hole transport layers, res- pectively. Compositions containing up to 25 percent lead reached efﬁciencies close to 15 percent, with tin-based compounds outperforming germanium-based ones. This approach integrates materials design and device simulation toward more stable and sustainable perovskite solar cells.

Analogía Schrödinger-Fick: marco teórico cuántico para el coeficiente de difusión y la barrera de potencial Uo

2026-05-11T20:21:44Z

Articulo Schrödinger-Fick analogy: quantum theoretical framework for the diffusion coefficient and potential barrier Uo XLI Congreso Argentino de Mecánica Computacional (Buenos Aires, 11 al 14 de noviembre de 2925); Mecánica Computacional; vol. 42, no. 9 La determinación precisa de los coeficientes de difusión, ya sean aparentes o relativos, exige la convergencia de mediciones experimentales, modelos teóricos sólidos y simulaciones numéricas avan- zadas. La estrecha analogía formal entre la ecuación de Schrödinger en estado estacionario y la ecuación de Fick permite aprovechar el rico andamiaje matemático de la Mecánica Cuántica para describir pro- cesos de transporte clásico. En este estudio teórico, partimos de esa semejanza para derivar expresiones analíticas del coeficiente de difusión (D) y la barrera de energía potencial U0 que debe superarse para que una partícula penetre en el medio difusor. Mediante el tratamiento cuántico de la función de onda estacionaria- análogo al perfil de concentración en difusión- se obtiene una relación directa entre las soluciones de Schrödinger y las soluciones de la ecuación de difusión unidimensional de Fick, estable- ciendo así un puente riguroso entre ambos formalismos. Como complemento conceptual, el modelo de random walk en una red bidimensional ilustra el desplazamiento aleatorio de partículas, reforzando la pertinencia del formalismo exhibido.; Precise determination of diffusion coefficients - apparent or relative - requires the convergen- ce of experimental measurements, robust theoretical models, and advanced numerical simulations. The close formal analogy between the time-independent Schrödinger equation and Fick’s diffusion equation enables the use of the rich mathematical framework of Quantum Mechanics to describe classical transport processes. In this theoretical study, we build upon this analogy to derive analytical expressions for the diffusion coefficient (D) and the potential energy barrier U0 that must be overcome for a particle to penetrate the diffusive medium. Through a quantum treatment of the stationary wave function—analogous to the concentration profile in diffusion—a direct relationship is established between the solutions of the Schrödinger equation and those of the one-dimensional Fick diffusion equation, thereby constructing a rigorous bridge between both formalisms. As a conceptual complement, a random walk model on a two-dimensional lattice is employed to illustrate the stochastic displacement of particles, reinforcing the relevance and applicability of the proposed formalism.

Diseño de estructuras porosas para regeneración ósea a partir de un modelo de aprendizaje inteligente y simulación mecánica computacional

2026-05-11T20:21:44Z

Articulo Design of porous structures for bone regeneration using a machine learning model & computational mechanical simulation XL Congreso Argentino de Mecánica Computacional (Rosario, 5 al 8 de noviembre de 2024); Mecánica Computacional; vol. 41, no. 17 La incorporación de la impresión 3D en los procesos de manufactura, ha revolucionado la medicina regenerativa en traumatología (MRT) al permitir la fabricación de implantes con estructuras porosas para promover la regeneración ósea (RO). Se han identificado dos características clave de estas estructuras: excelentes propiedades mecánicas y biocompatibilidad. Sin embargo, se han reportado resultados diversos a partir de la evaluación de variantes geométricas respecto a las características morfológicas óptimas para estimular la RO. Este trabajo propone una metodología novedosa para diseñar implantes óseos con estructuras optimizadas, mediante Aprendizaje Inteligente y Simulación Mecánica Computacional. A partir de una búsqueda bibliográfica se creó una base de datos estructuras porosas 3D con potencial comprobado para estimular la RO, a partir de la cual se entrenó un Modelo Estadístico de Forma para genere una librería de estructuras nuevas. Éstas se evaluaron mediante SMC, utilizando el Método de los Elementos Finitos y se seleccionaron las geometrías con mejor rendimiento mecánico para una posible respuesta biológica. Las estructuras optimizadas obtenidas abren un camino hacia la validación in vivo para la promoción de la RO, con potencial impacto en la MRT.; Recent addition of 3D printing into manufacturing processes has revolutionized regenerative medicine in traumatology (RMT) by enabling the production of implants with porous structures to promote bone regeneration (BR). Two key features were identified: excellent mechanical properties and biocompatibility. However, diverse results have been reported regarding the optimal morphological characteristics of geometric variants to stimulate BR. This work proposes a novel methodology for designing bone implants with optimized porous structures, by combining Machine Learning with Computational Mechanical Simulation. A literature review led to the creation of a database of 3D porous structures with proven potential to stimulate BR and train a Statistical Shape Model to generate a library of novel porous structures. Those structures were evaluated using CMS, employing the Finite Element Method, and the geometries with the best mechanical performance were selected for a potential biological response, setting the stage for in vivo validation to promote BR, with a potential impact on RMT.

Search for the standard model Higgs boson produced in association with top quark and decaying into a bb̄ pair in pp collisions at √s = 13 TeV with the ATLAS detector

2026-05-06T20:21:32Z

Articulo Physical Review D; vol. 97, no. 7 A search for the standard model Higgs boson produced in association with a top-quark pair, tt̄H, is presented. The analysis uses 36.1 fb−1 of pp collision data at √s = 13 TeV collected with the ATLAS detector at the Large Hadron Collider in 2015 and 2016. The search targets the H → bb̄ decay mode. The selected events contain either one or two electrons or muons from the top-quark decays, and are then categorized according to the number of jets and how likely these are to contain b-hadrons. Multivariate techniques are used to discriminate between signal and background events, the latter being dominated by tt̄ + jets production. For a Higgs boson mass of 125 GeV, the ratio of the measured tt̄H signal cross-section to the standard model expectation is found to be μ = 0.84 ± 0.64 − 0.61. A value of μ greater than 2.0 is excluded at 95% confidence level (C.L.) while the expected upper limit is μ < 1.2 in the absence of a tt̄H signal. La lista completa de autores que integran el documento puede consultarse en el archivo.

Search for long-lived, massive particles in events with displaced vertices and missing transverse momentum in √s = 13 TeV pp collisions with the ATLAS detector

2026-05-06T20:21:34Z

Articulo Physical Review D; vol. 97, no. 5 A search for long-lived, massive particles predicted by many theories beyond the Standard Model is presented. The search targets final states with large missing transverse momentum and at least one high-mass displaced vertex with five or more tracks, and uses 32.8 fb⁻¹ of √s = 13 TeV pp collision data collected by the ATLAS detector at the LHC. The observed yield is consistent with the expected background. The results are used to extract 95% C.L. exclusion limits on the production of long-lived gluinos with masses up to 2.37 TeV and lifetimes of O (10⁻²) − O (10) ns in a simplified model inspired by split supersymmetry. La lista completa de autores que integran el documento puede consultarse en el archivo.

ZZ → ℓ−ℓ+ℓ′−ℓ′+ cross-section measurements and search for anomalous triple gauge couplings in 13 TeV pp collisions with the ATLAS detector

2026-05-05T04:21:18Z

Articulo Physical Review D; vol. 97 no. 3 Measurements of ZZ production in the ℓ−ℓ+ℓ′−ℓ′+ channel in proton–proton collisions at 13 TeV center-of-mass energy at the Large Hadron Collider are presented. The data correspond to 36.1 fb−1 of collisions collected by the ATLAS experiment in 2015 and 2016. Here l and l0 stand for electrons or muons. Integrated and differential ZZ → ℓ−ℓ+ℓ′−ℓ′+ cross sections with Z → ℓ−ℓ+ candidate masses in the range of 66 GeV to 116 GeV are measured in a fiducial phase space corresponding to the detector acceptance and corrected for detector effects. The differential cross sections are presented in bins of twenty observables, including several that describe the jet activity. The integrated cross section is also extrapolated to a total phase space and to all standard model decays of Z bosons with mass between 66 GeV and 116 GeV, resulting in a value of 17.3 ± [0.9 0.6 (stat) ± 0.5 (syst) ± 0.6 (lumi)] pb. The measurements are found to be in good agreement with the standard model. A search for neutral triple gauge couplings is performed using the transverse momentum distribution of the leading Z boson candidate. No evidence for such couplings is found and exclusion limits are set on their parameters. La lista completa de autores que integran el documento puede consultarse en el archivo.

Search for long-lived particles in final states with displaced dimuon vertices in pp collisions at √s = 13 TeV with the ATLAS detector

2026-05-05T04:21:20Z

Articulo Physical Review D; vol. 99 no. 1 A search is performed for a long-lived particle decaying into a final state that includes a pair of muons of opposite-sign electric charge, using proton-proton collision data collected at s ¼ 13 TeV by the ATLAS detector at the Large Hadron Collider corresponding to an integrated luminosity of 32.9 fb⁻¹. No significant excess over the Standard Model expectation is observed. Limits at 95% confidence level on the lifetime of the long-lived particle are presented in models of new phenomena including gauge-mediated supersymmetry or decay of the Higgs boson, H, to a pair of dark photons, ZD. Lifetimes in the range cτ ¼ 1–2400 cm are excluded, depending on the parameters of the model. In the supersymmetric model, the lightest neutralino is the next-to-lightest supersymmetric particle, with a relatively long lifetime due to its weak coupling to the gravitino, the lightest supersymmetric particle. The lifetime limits are determined for very light gravitino mass and various assumptions for the neutralino mass in the range 300–1000 GeV. In the dark photon model, the lifetime limits are interpreted as exclusion contours in the plane of the coupling between the ZD and the Standard Model Z boson versus the ZD mass (in the range 20–60 GeV), for various assumptions for the H → ZD ZD branching fraction. La lista completa de autores que integran el documento puede consultarse en el archivo.

Search for TeV-scale gravity signatures in high-mass ﬁnal states with leptons and jets with the ATLAS detector at √s = 13 TeV

2026-05-05T04:21:22Z

Articulo Physics Letters B; vol. 760 A search for physics beyond the Standard Model, in ﬁnal states with at least one high transverse momentum charged lepton (electron or muon) and two additional high transverse momentum leptons or jets, is performed using 3.2 fb⁻¹ of proton–proton collision data recorded by the ATLAS detector at the Large Hadron Collider in 2015 at √s = 13 TeV. The upper end of the distribution of the scalar sum of the transverse momenta of leptons and jets is sensitive to the production of high-mass objects. No excess of events beyond Standard Model predictions is observed. Exclusion limits are set for models of microscopic black holes with two to six extra dimensions. La lista completa de autores que integran el documento puede consultarse en el archivo.