Departamento de Física

Hydrogen adsorption on alkali and alkaline earth functionalized silicene: A first-principles and kinetic modeling study

2026-07-17T20:25:12Z

Articulo International Journal of Hydrogen Energy; vol. 174 This study explores hydrogen adsorption in silicene modified through substitutional doping with transition metals (M = Cu, Sn, Ti, V, and Zn) and decorated with alkali or alkaline-earth metals (A = K, Li, and Mg), using first principles within the framework of Density Functional Theory. Substitutions were found to be energetically unfavorable, indicating weak M-silicene interactions. However, the introduction of decorations significantly improved binding energy. K and Li atoms formed stable bonds with silicene, while Mg showed weak interactions. Among all configurations, Ti@Li and V@Li systems showed adsorption energies slightly lower than the recommended range (−0.43 and −0.42 𝑒𝑉 ), yet achieved ideal desorption temperatures (308.20 − 359.36 𝐾 and rapid desorption times (< 2.5 𝑚s), making them promising candidates for hydrogen storage under ambient conditions. Ti@K and V@K systems also met the energy criteria but required higher pressures (∼ 100 bar). Moreover, the Ti@Li, V@Li, and Ti@K systems all satisfy the required gravimetric benchmark for hydrogen storage, each providing a maximum capacity of approximately 9 wt%. Density of states analysis revealed strong hybridization between Ti or V and silicene near the Fermi level, while Sn and Mg showed weak interaction. Charge density difference analysis showed localized interaction with hydrogen. Additionally, temperature-programmed desorption (TPD) simulations based on first-order kinetics accurately reproduced desorption peak temperatures and coverage behavior, revealing the strong influence of both dopants and adatoms on hydrogen binding strength. These results provide valuable insight into the thermal stability and adsorption properties of the modified silicene systems. These findings identify Ti@Li, V@Li and Ti@K as promising candidates for hydrogen storage in silicene.

Strongly interacting matter in extreme magnetic fields

2026-07-01T20:23:48Z

Revision Progress in Particle and Nuclear Physics; vol. 146, parte 1 Magnetic fields are ubiquitous across different physical systems of current interest; from the early Universe, compact astrophysical objects, and heavy-ion collisions to condensed matter systems. A proper treatment of the effects produced by magnetic fields during the dynamical evolution of these systems can help to understand observables that otherwise show puzzling behavior. Furthermore, when these fields are comparable to or stronger than 𝛬QCD they serve as excellent probes to help elucidate the physics of strongly interacting matter under extreme conditions of temperature and density. This work provides a detailed report that contains in-depth analysis and expert insights into the specific topic of the effects of strong magnetic fields on QED and QCD systems. In this sense, the report is intended as a white paper contribution to the field. The subjects developed include the modification of meson static properties such as masses and form factors, the chiral magnetic effect, the description of anomalous transport coefficients, superconductivity in extreme magnetic fields, the properties of neutron stars, the evolution of heavy-ion collisions, as well as effects on the QCD phase diagram. We describe recent theory and phenomenological developments using effective models as well as LQCD methods. The work was motivated by presentations and discussions during the "Workshop on Strongly Interacting Matter in Strong Electromagnetic Fields” that took place in the European Centre for Theoretical Studies in Nuclear Physics and Related Areas (ECT*) in the city of Trento, Italy, September 25–29, 2023. La lista completa de autores que integran el documento puede consultarse en el archivo.

Statistical complexity as a universal indicator of thermodynamic crossovers in ideal and van der Waals gases

2026-07-01T04:34:42Z

Articulo Results in Physics; vol. 86 We investigate the behavior of statistical complexity in interacting classical gases within the grand canonical ensemble. The analysis is carried out in an excluded-volume (van der Waals-type) framework, which captures the leading effects of repulsive interactions through a reduction of accessible phase space. A concise and self-contained formulation of statistical complexity is provided, emphasizing its interpretation as a measure of structural organization in the underlying probability distribution. We show that interaction effects induce a nontrivial reorganization of phase space, reflected in the behavior of statistical complexity as a function of thermodynamic parameters. In particular, the presence of excluded volume modifies the balance between disorder and structure, leading to qualitative changes absent in the ideal gas case. These features are traced back to the redistribution of accessible configurations imposed by finite-volume constraints. The results demonstrate that statistical complexity serves as a sensitive probe of interaction-induced structural changes. While the analysis is model-dependent, the observed behavior is robust within excluded- volume descriptions and highlights the role of repulsive interactions in shaping the statistical structure of the system.

Charged-hadron and identified-hadron (K⁰S, Λ, Ξ⁻) yield measurements in photonuclear Pb + Pb and p + Pb collisions at √sNN = 5.02 TeV with ATLAS

2026-06-23T20:27:15Z

Articulo Physical Review C; vol. 111, no. 6 This paper presents the measurement of charged-hadron and identified-hadron (K S ⁰, Λ, Ξ⁻) yields in photonuclear collisions using 1.7 nb⁻¹ of √s N N = 5.02 TeV Pb + Pb data collected in 2018 with the ATLAS detector at the Large Hadron Collider. Candidate photonuclear events are selected using a combination of tracking and calorimeter information, including the zero-degree calorimeter. The yields as a function of transverse momentum and rapidity are measured in these photonuclear collisions as a function of charged-particle multiplicity. These photonuclear results are compared with 0.1 nb⁻¹ of √s N N = 5.02 TeV p + Pb data collected in 2016 by ATLAS using similar charged-particle multiplicity selections. These photonuclear measurements shed light on potential quark-gluon plasma formation in photonuclear collisions via observables sensitive to radial flow, enhanced baryon-to-meson ratios, and strangeness enhancement. The results are also compared with the Monte Carlo generator and hydrodynamic calculations to test whether such photonuclear collisions may produce small droplets of quark-gluon plasma that flow collectively. La lista completa de autores que integran el documento puede consultarse en el archivo.

Weakly supervised anomaly detection for resonant new physics in the dijet final state using proton-proton collisions at √s = 13 TeV with the ATLAS detector

2026-06-23T20:27:20Z

Articulo Physical Review D; vol. 112, no. 7 An anomaly detection search for narrow-width resonances beyond the Standard Model that decay into a pair of jets is presented. The search is based on 139 fb⁻¹ of proton-proton collisions at √s = 13 TeV recorded during 2015–2018 with the ATLAS detector at the Large Hadron Collider. The analysis is optimized without a particular signal model and aims to be sensitive to a broad range of new physics. It uses two different machine learning strategies to estimate the background in different signal regions. In each region, a weakly supervised classifier is trained to distinguish this background model from data. The analysis focuses on events with high transverse momentum jets reconstructed as large-radius jets. The mass and substructure of these jets are used as inputs to the classifiers. After a classifier-based selection, the distribution of the invariant mass of the two jets is used to search for potential local excesses. The model-independent results of both the anomaly detection methods show no signs of significant local excesses. In addition to model-independent results, a representative set of signal models is injected into the data, and the sensitivity of the methods to these scenarios is reported. La lista completa de autores que integran el documento puede consultarse en el archivo.

Search for electroweak-scale dijet resonances using trigger-level analysis with the ATLAS detector in 132 fb⁻¹ of pp collisions at √s = 13 TeV

2026-06-23T20:27:20Z

Articulo Physical Review D; vol. 112, no. 9 This article reports on a search for dijet resonances using 132 fb⁻¹ of pp collision data recorded at √s = 13 TeV by the ATLAS detector at the Large Hadron Collider. The search is performed solely on jets reconstructed within the ATLAS trigger to overcome bandwidth limitations imposed on conventional single-jet triggers, which would otherwise reject data from decays of sub-TeV dijet resonances. Collision events with two jets satisfying transverse momentum thresholds of pT ≥ 85 GeV and jet rapidity separation of |y*| < 0.6 are analysed for dijet resonances with invariant masses from 375 to 1800 GeV. A data-driven background estimate is used to model the dijet mass distribution from multijet processes. No significant excess above the expected background is observed. Upper limits are set at 95% confidence level on coupling values for a benchmark leptophobic axial-vector Z′ model and on the production cross section for a new resonance contributing a Gaussian-distributed line-shape to the dijet mass distribution. La lista completa de autores que integran el documento puede consultarse en el archivo.

Search for decays of the Higgs boson into scalar particles decaying into four or six b quarks using pp collisions at √s=13 TeV with the ATLAS detector

2026-06-23T20:27:21Z

Articulo Physical Review D; vol. 112, no. 7 A search for exotic decays of the Higgs boson H into new scalar or pseudoscalar particles that subsequently decay into b-quarks is presented. The search considers ZH production with several decay scenarios for the Higgs boson; first to a pair of identical scalars, H→2a→4b, second to a pair of scalars with different masses (ma₁ < ma₂), either directly, H→a₁a₂→4b, or via a longer decay chain, H→a₁a₂→3a1→6b. The analysis uses proton-proton collision data at √s=13 TeV collected with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 140 fb−1. No significant excess above the Standard Model prediction is observed. The search sets upper limits at 95% confidence level on the ratio of the Higgs boson production cross section to the SM prediction times the branching ratio of Higgs bosons decaying into 4b or 6b, between 4% and 25% for σ(ZH)/σSM(ZH)×B(H→2a→4b), between 24% and 38% for σ(ZH)/σSM(ZH)×B(H→a₁a₂→4b), and between 10% and 20% for σ(ZH)/σSM(ZH)×B(H→a₁a₂→3a₁→6b), depending on the masses of the scalar particles. La lista completa de autores que integran el documento puede consultarse en el archivo.

Evidence for the Collective Nature of Radial Flow in Pb + Pb Collisions with the ATLAS Detector

2026-06-23T20:27:22Z

Articulo Physical Review Letters; vol. 136, no. 3 Anisotropic flow and radial flow are two key probes of the expansion dynamics and properties of the quark-gluon plasma (QGP). While anisotropic flow has been extensively studied, radial flow, which governs the system’s radial expansion, has received less attention. Notably, direct experimental evidence for the global and collective nature of radial flow fluctuations has been lacking. This Letter presents the first measurement of transverse momentum (pT) dependence of radial flow fluctuations (v₀(pT)) over 0.5 < pT < 10 GeV and demonstrates its collective nature using a two-particle correlation method in Pb + Pb collisions at √sNN = 5.02 TeV. The data reveal three key features supporting the collective nature of radial flow: long-range correlation in pseudorapidity, factorization in pT, and centrality-independent shape in pT. The comparison with a hydrodynamic model demonstrates the sensitivity of v₀ (pT) to bulk viscosity, a crucial transport property of the QGP. These findings establish a new, powerful tool for probing collective dynamics and properties of the QGP. La lista completa de autores que integran el documento puede consultarse en el archivo.

Combination of searches for singly produced vectorlike top quarks in pp collisions at √s=13 TeV with the ATLAS detector

2026-06-23T20:27:27Z

Articulo Physical Review D; vol. 111, no. 1 A combination of searches for the single production of vectorlike top quarks (T) is presented. These analyses are based on proton-proton collisions at √s=13 TeV recorded in 2015–2018 with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 139 fb−1. The T decay modes considered in this combination are into a top quark and either a Standard Model Higgs boson or a Z boson (T→Ht and T→Zt). The individual searches used in the combination are differentiated by the number of leptons (e, μ) in the final state. The observed data are found to be in good agreement with the Standard Model background prediction. Interpretations are provided for a range of masses and couplings of the vectorlike top quark for benchmark models and generalized representations in terms of 95% confidence level limits. For a benchmark signal prediction of a vectorlike top quark SU(2) singlet with electroweak coupling, κ, of 0.5, masses below 2.1 TeV are excluded, resulting in the most restrictive limits to date. La lista completa de autores que integran el documento puede consultarse en el archivo.

Search for charged Higgs bosons produced in top-quark decays or in association with top quarks and decaying via H±→τ±ντ in 13 TeV pp collisions with the ATLAS detector

2026-06-23T20:27:28Z

Articulo Physical Review D; vol. 111, no. 7 Charged Higgs bosons produced either in top-quark decays or in association with a top quark, subsequently decaying via H±→τ±ντ, are searched for in 140 fb−1 of proton-proton collision data at √s=13 TeV recorded with the ATLAS detector. Depending on whether the top quark is produced together with the H± decays hadronically or semileptonically, the search targets τ+jets or τ+lepton final states, in both cases with a τ-lepton decaying into a neutrino and hadrons. No significant excess over the Standard Model background expectation is observed. For the mass range of 80≤mH±≤3000 GeV, upper limits at 95% confidence level are set on the production cross section of the charged Higgs boson times the branching fraction B(H±→τ±ντ) in the range 4.5 pb–0.4 fb. In the mass range 80–160 GeV, assuming the Standard Model cross section for tt¯ production, this corresponds to upper limits between 0.27% and 0.02% on B(t→bH±)×B(H±→τ±ντ). La lista completa de autores que integran el documento puede consultarse en el archivo.

Search for new physics in final states with semivisible jets or anomalous signatures using the ATLAS detector

2026-06-23T20:27:29Z

Articulo Physical Review D; vol. 112, no. 1 A search is presented for hadronic signatures of beyond the Standard Model (BSM) physics, with an emphasis on signatures of a strongly coupled hidden dark sector accessed via resonant production of a Z′ mediator. The ATLAS experiment dataset collected at the Large Hadron Collider from 2015 to 2018 is used, consisting of proton-proton collisions at √s=13 TeV and corresponding to an integrated luminosity of 140 fb−1. The Z′ mediator is considered to decay to two dark quarks, which each hadronize and decay to showers containing both dark and Standard Model particles, producing a topology of interacting and noninteracting particles within a jet known as “semivisible.” Machine learning methods are used to select these dark showers and reject the dominant background of mismeasured multijet events, including an anomaly detection approach to preserve broad sensitivity to a variety of BSM topologies. A resonance search is performed by fitting the transverse mass spectrum based on a functional form background estimation. No significant excess over the expected background is observed. Results are presented as limits on the production cross section of semivisible jet signals, parametrized by the fraction of invisible particles in the decay and the Z′ mass, and by quantifying the significance of any generic Gaussian-shaped mass peak in the anomaly region. La lista completa de autores que integran el documento puede consultarse en el archivo asociado.

Search for triple Higgs boson production in the 6b final state using pp collisions at √s=13 TeV with the ATLAS detector

2026-06-23T20:27:30Z

Articulo Physical Review D; vol. 111, no. 3 A search for the production of three Higgs bosons (HHH) in the bb¯bb¯bb¯ final state is presented. The search uses 126 fb−1 of proton-proton collision data at √s=13 TeV collected with the ATLAS detector at the Large Hadron Collider. The analysis targets both nonresonant and resonant production of HHH. The resonant interpretations primarily consider a cascade decay topology of X→SH→HHH with masses of the new scalars X and S up to 1.5 and 1 TeV, respectively. In addition to scenarios where S is off-shell, the nonresonant interpretation includes a search for Standard Model HHH production, with limits on the trilinear and quartic Higgs self-coupling set. No evidence for HHH production is observed. An upper limit of 59 fb is set, at the 95% confidence level, on the cross section for Standard Model HHH production. La lista completa de autores que integran el documento puede consultarse en el archivo asociado.

Search for events with one displaced vertex from long-lived neutral particles decaying into hadronic jets in the ATLAS muon spectrometer in pp collisions at √s = 13 TeV

2026-06-23T20:27:37Z

Articulo Physical Review D; vol. 112, no. 9 A search for events with one displaced vertex from long-lived particles using data collected by the ATLAS detector at the Large Hadron Collider is presented, using 140 fb − 1 of proton-proton collision data at s = 13 TeV recorded in 2015–2018. The search employs techniques for reconstructing vertices of long-lived particles decaying into hadronic jets in the muon spectrometer displaced between 3 m and 14 m from the primary interaction vertex. The observed number of events is consistent with the expected background and limits for several benchmark signals are determined. A scalar-portal model and a Higgs-boson-portal baryogenesis model are considered. A dedicated analysis channel is employed to target Z-boson associated long-lived particle production, including an axionlike particle and a dark photon model. For the Higgs boson model, branching fractions above 1% are excluded at 95% confidence level for long-lived particle proper decay lengths ranging from 5 cm to 40 m. For the photophobic axionlike particle model considered, this search produces the strongest limits to date for proper decay lengths greater than O ( 10 ) cm . La lista completa de autores que integran el documento puede consultarse en el archivo asociado.

Measurement of the azimuthal anisotropy of charged particles in √s N N = 5.36 TeV O 16 + O 16 and Ne 20 + Ne 20 collisions with the ATLAS detector

2026-06-23T20:27:39Z

Articulo Physical Review C; vol. 113, no. 4 This paper presents the first measurements of the azimuthal anisotropy coefficients v n , which quantify the n th -order Fourier modulation of charged-particle azimuthal distributions, for n = 2 − 4 in s N N = 5.36 TeV O 16 + O 16 and Ne 20 + Ne 20 collisions recorded with the ATLAS detector at the CERN Large Hadron Collider in 2025. The v n coefficients are measured as a function of transverse momentum ( p T ), collision centrality, and event multiplicity. They are extracted using two complementary methods: two-particle correlations with a template-fit subtraction of short-range nonflow contributions, and four-particle subevent cumulants, which intrinsically suppress nonflow effects and provide sensitivity to flow fluctuations. The results show a clear hierarchy v 2 > v 3 > v 4 and a nonmonotonic dependence on p T , reaching a maximum around 2 GeV , consistent with trends observed in heavy-ion collisions. Detailed comparisons between the two collision systems reveal an enhanced v 2 in central Ne 20 + Ne 20 collisions, consistent with theory expectations based on the predicted prolate deformation of neon nuclei, in contrast to the slightly tetrahedral structure predicted for oxygen. The four-particle cumulant results highlight strong event-by-event fluctuations and provide the greatest sensitivity to nuclear shape effects. These measurements can place new constraints on the initial geometry and the hydrodynamic response in light-ion collisions, offering valuable input for models of nuclear structure. La lista completa de autores que integran el documento puede consultarse en el archivo asociado.

Evidence for Longitudinally Polarized W Bosons in the Electroweak Production of Same-Sign W Boson Pairs in Association with Two Jets in p p Collisions at √s = 13 TeV with the ATLAS Detector

2026-06-23T20:27:40Z

Articulo Physical Review Letters; vol. 135, no. 11 This Letter reports the first evidence of electroweak production of same-sign W boson pairs where at least one of the W bosons is longitudinally polarized and the most stringent constraint to date for the production of two longitudinally polarized same-sign W bosons. The dataset used corresponds to an integrated luminosity of 140 fb − 1 of proton-proton collisions at a center-of-mass energy of 13 TeV, collected with the ATLAS detector during run 2 of the Large Hadron Collider. The study is performed in final states including two same-sign leptons (electrons or muons), missing transverse momentum, and at least two jets with a large invariant mass and a large rapidity difference. Two independent fits are performed targeting the production of same-sign W bosons with at least one, or two longitudinally polarized W bosons. The observed (expected) significance of the production with at least one longitudinally polarized W boson is 3.3 (4.0) standard deviations. An observed (expected) 95% confidence level upper limit of 0.45 (0.70) fb is reported on the fiducial production cross section of two longitudinally polarized same-sign W bosons. La lista completa de autores que integran el documento puede consultarse en el archivo asociado.

Search for Dark Matter Produced in Association with a Dark Higgs Boson in the b¯b Final State Using pp Collisions at √s = 13 TeV with the ATLAS Detector

2026-06-22T20:44:29Z

Articulo Physical Review Letters; vol. 134, no. 12 A search is performed for dark matter particles produced in association with a resonantly produced pair of b -quarks with 30 < m bb < 150 GeV using 140 fb⁻¹ of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector at the LHC. This signature is expected in extensions of the standard model predicting the production of dark matter particles, in particular those containing a dark Higgs boson s that decays into b¯b. The highly boosted s → b¯b topology is reconstructed using jet reclustering and a new identification algorithm. This search places stringent constraints across regions of the dark Higgs model parameter space that satisfy the observed relic density, excluding dark Higgs bosons with masses between 30 and 150 GeV in benchmark scenarios with Z ′ mediator masses up to 4.8 TeV at 95% confidence level. La lista completa de autores que integran el documento puede consultarse en el archivo.

Jet radius dependence of dijet momentum balance and suppression in Pb+Pb collisions at 5.02 TeV with the ATLAS detector

2026-06-22T20:44:30Z

Articulo Physical Review C; vol. 110, no. 5 This paper describes a measurement of the jet radius dependence of the dijet momentum balance between leading back-to-back jets in 1.72 nb ⁻¹ of Pb + Pb collisions collected in 2018 and 255 pb⁻¹ of pp collisions collected in 2017 by the ATLAS detector at the LHC. Both datasets were collected at √sNN = 5.02 TeV. Jets are reconstructed using the anti- k t algorithm with jet radius parameters R = 0.2, 0.3, 0.4, 0.5, and 0.6. The dijet momentum balance distributions are constructed for leading jets with transverse momentum pT from 100 to 562 GeV for R = 0.2 , 0.3, and 0.4 jets, and from 158 to 562 GeV for R = 0.5 and 0.6 jets. The absolutely normalized dijet momentum balance distributions are constructed to compare measurements of the dijet yields in Pb + Pb collisions directly to the dijet cross sections in pp collisions. For all jet radii considered here, there is a suppression of more balanced dijets in Pb + Pb collisions compared with pp collisions, while for more imbalanced dijets there is an enhancement. There is a jet radius dependence to the dijet yields, being stronger for more imbalanced dijets than for more balanced dijets. Additionally, jet pair nuclear modification factors are measured. The subleading jet yields are found to be more suppressed than leading jet yields in dijets. A jet radius dependence of the pair nuclear modification factors is observed, with the suppression decreasing with increasing jet radius. These measurements provide new constraints on jet quenching scenarios in the quark-gluon plasma. La lista completa de autores que integran el documento puede consultarse en el archivo.

Evidence for the Dimuon Decay of the Higgs Boson in pp Collisions with the ATLAS Detector

2026-06-22T20:44:32Z

Articulo Physical Review Letters; vol. 135, no. 23 A search for the dimuon decay of the Higgs boson is presented based on pp collision data recorded by ATLAS during Run 3 of the Large Hadron Collider, corresponding to an integrated luminosity of 165 fb⁻¹ at √s = 13.6 TeV . To enhance the sensitivity, the results are combined with those from Run 2. An excess of events over the background is observed with a significance of 3.4 σ (2.5 σ expected). The best-fit signal strength is μ = 1.4 ± 0.4 . This result provides evidence for the H → μμ decay with ATLAS data and offers a direct probe of the Higgs-boson Yukawa coupling to second-generation fermions. La lista completa de autores que integran el documento puede consultarse en el archivo.

Search for displaced leptons in √s=13 TeV and 13.6 TeV pp collisions with the ATLAS detector

2026-06-22T20:44:33Z

Articulo Physical Review D; vol. 112, no. 1 A search for leptons displaced from the primary vertex is performed with the ATLAS detector at the Large Hadron Collider. The search includes the full proton-proton collision dataset collected during Run 2 at √s=13 TeV and a partial dataset collected during Run 3 in 2022–2023 at √s=13.6 TeV, corresponding to integrated luminosities of 140 fb⁻¹. and 56.3 fb⁻¹, respectively. Final states with displaced electrons or muons are considered, and novel triggers introduced in Run 3 are employed that use large impact parameter tracking to reconstruct displaced tracks with low momentum. In addition, photon reconstruction and multivariate techniques are employed to broaden the sensitivity to channels with large background rates or highly displaced electrons, respectively. The results are consistent with the Standard Model background expectations and are used to set model-independent limits on the production of displaced electrons and muons. The analysis is also interpreted in the context of a gauge-mediated supersymmetry breaking model with pair-produced long-lived sleptons and a dark sector model with pair-produced chargino-like states. The results include 95% confidence level exclusions of selectrons with lifetimes from 4 ps to 60 ns and a mass of 150 GeV, and exclusions of selectrons, smuons, and staus with a lifetime of 0.3 ns for masses up to 740, 830, and 440 GeV, respectively. Dark charginos with masses up to 380 GeV are excluded for a mass difference with the neutral state of 40 GeV, and mass differences down to 17 GeV are excluded for dark charginos with a 100 GeV mass. La lista completa de autores que integran el documento puede consultarse en el archivo.

Measurement of photonuclear jet production in ultraperipheral Pb+Pb collisions at √sNN=5.02 TeV with the ATLAS detector

2026-06-22T20:44:35Z

Articulo Physical Review D; vol. 111, no. 5 In ultrarelativistic heavy ion collisions at the LHC, each nucleus acts a sources of high-energy real photons that can scatter off the opposing nucleus in ultraperipheral photonuclear (γ+A) collisions. Hard scattering processes initiated by the photons in such collisions provide a novel method for probing nuclear parton distributions in a kinematic region not easily accessible to other measurements. ATLAS has measured production of dijet and multijet final states in ultraperipheral Pb+Pb collisions at √sNN=5.02 TeV using a dataset recorded in 2018 with an integrated luminosity of 1.72 nb⁻¹.. Photonuclear final states are selected by requiring a rapidity gap in the photon direction; this selects events where one of the outgoing nuclei remains intact. Jets are reconstructed using the anti-kt algorithm with radius parameter, R=0.4. Triple-differential cross sections, unfolded for detector response, are measured and presented using two sets of kinematic variables. The first set consists of the total transverse momentum (HT), rapidity, and mass of the jet system. The second set uses HT and particle-level nuclear and photon parton momentum fractions, xA and zγ, respectively. The results are compared with leading-order perturbative QCD calculations of photonuclear jet production cross sections, where all leading order predictions using existing fits fall below the data in the shadowing region. More detailed theoretical comparisons will allow these results to strongly constrain nuclear parton distributions, and these data provide results from the LHC directly comparable to early physics results at the planned Electron-Ion Collider. La lista completa de autores que integran el documento puede consultarse en el archivo.