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Irles, A. (2026). Test of a partly instrumented highly compact and granular electromagnetic calorimeter in an electron beam of 1-6 GeV. Eur. Phys. J. Plus, 141(6), 727–5pp.
Abstract: Highly compact and finely segmented silicon-tungsten electromagnetic calorimeters are being developed within the FCAL collaboration for applications in the LUXE experiment at DESY and future electron-positron collider facilities. These detectors combine tungsten absorber plates with thin silicon pad sensors, providing a small effective Moli & egrave;re radius and high spatial granularity, which are essential for resolving nearby electromagnetic showers in high-occupancy environments. The fundamental active unit of this calorimeter concept is the Compact Silicon Sandwich (CSIS), integrating a silicon pad sensor together with signal routing, high-voltage distribution and mechanical support in a highly compact structure. The assembly of these CSIS modules is performed within a dedicated infrastructure for silicon detector integration. A partially instrumented prototype of such a calorimeter has been tested in an electron beam with energies between 1 and 6 GeV. First results from the 2025 test beam campaign are presented, including minimum-ionizing particle calibration and preliminary event displays illustrating the shower development in the highly granular detector. These results constitute an important step towards the validation of this technology for LUXE and future collider experiments.
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Madurga, M. et al, Morales, A. I., & Nacher, E. (2026). Beta-Delayed Neutron Emission of N=84 132Cd. Phys. Rev. Lett., 136(23), 232504–7pp.
Abstract: Using the time-of-flight technique, we measured the beta-delayed neutron emission of Cd-132. From our large-scale shell model (LSSM) calculation using the (NLO)-L-3 interaction [Z. Y. Xu et al., Phys. Rev. Lett. 131, 022501 (2023)], we suggest the decay is dominated by the transformation of a neutron in the g(7/2) orbital, deep below the Fermi surface, into a proton in the g(9/2)( )orbital. We compare the beta-decay half-lives and neutron branching ratios of nuclei with Z < 50 and N >= 82 obtained with our LSSM with those of leading “global” models such as finite-range droplet model (FRDM). Our calculations match known half-lives and neutron branching ratios well and suggest that current leading models overestimate the yet-to-be-measured half-lives. Our model, backed by the Cd-132 decay data presented here, offers robust predictive power for nuclei of astrophysical interest such as r-process waiting points.
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ATLAS Collaboration(Aad, G. et al), Aikot, A., Amos, K. R., Bouchhar, N., Cabrera Urban, S., Cantero, J., et al. (2026). Search for a resonance decaying into a scalar particle and a Higgs boson in the final state with two bottom quarks and two photons with 199 fb-1 of data collected at √s=13 and 13.6 TeV with the ATLAS detector. Phys. Lett. B, 877, 140425–19pp.
Abstract: A search for the resonant production of a heavy scalar X decaying into a lighter scalar S and a Higgs boson, through the process X -> S(-> b (b) over bar )H(-> gamma gamma), where the two photons are consistent with the Higgs boson decay, is performed. The search is conducted using integrated luminosities of 140 and 59 fb(-1) of proton-proton collision data at centre-of-mass energies of 13 and 13.6 TeV, respectively, recorded with the ATLAS detector at the LHC. The search is performed over the mass ranges of 170 <= m(X) <= 1000 GeV and 15 <= m(S) <= 500 GeV. No significant excess over the Standard Model background predictions is observed and limits at 95% confidence level are set on the product of cross section and branching fraction for the process X -> S(-> b (b) over bar )H(-> gamma gamma) at 13 TeV, ranging from 9 fb to 0.06 fb.
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Melini, D. (2026). Top-quark physics: from Run 2 to the HL-LHC. Eur. Phys. J. Plus, 141(6), 698–5pp.
Abstract: The top quark is a fundamental particle of the standard model and plays an important role in beyond the standard model scenarios. The status of top-quark measurements by ATLAS and CMS is summarized, reporting new recent measurements of top-quark cross sections and top-quark properties. The future high-luminosity run of the Large Hadron Collider is foreseen to produce a huge dataset where top quarks can be studied in detail. The latest projections on expected results on top-quark physics in future high-luminosity runs of the Large Hadron Collider are presented, and the impact of such future measurements on testing the standard model consistency and on constraining new physics scenarios is evaluated.
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ATLAS Collaboration(Aad, G. et al), Aikot, A., Amos, K. R., Bouchhar, N., Cabrera Urban, S., Cantero, J., et al. (2026). Characterization of nuclear breakup as a function of hard-scattering kinematics using dijets measured by ATLAS in p plus Pb collisions. Phys. Lett. B, 877, 140440–18pp.
Abstract: This Letter analyzes the sensitivity of event geometry estimators to the initial-state kinematics of hard scattering in proton-lead collisions. This analysis uses dijets as a proxy for the parton-parton scattering configuration, correlating it with event geometry estimators, namely the energy deposited in the Zero-Degree Calorimeter and the transverse energy recorded in the Forward Calorimeter in the Pb-going direction. The analysis uses data recorded by the ATLAS detector at the Large Hadron Collider with a nucleon-nucleon center-of-mass energy of 8.16 TeV, corresponding to an integrated luminosity of 56 nb(-1). The jets are measured within the pseudorapidity interval -2.8 < eta < 4.5, where positive eta values correspond to the direction of the proton beam. Results are presented as a function of the Bjorken-x of the parton originating from the proton, x(p). Both event geometry estimators are found to be dependent on x(p), with the energy deposited in the Zero-Degree Calorimeter about six times less sensitive to x(p) compared with the transverse energy deposited in the Forward Calorimeter.
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