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Encarnacion, P., Feijoo, A., & Oset, E. (2026). Scattering observables and correlation function for p f1(1285) revisited. Phys. Rev. D, 113(11), L111502–8pp.
Abstract: In view of the recent theoretical developments in the fixed center approximation for the scattering of a particle with a a two-body cluster, implementing elastic unitarity on the standard fixed center formalism, and the imminent availability of ALICE data on the correlation function of the p f1(1285) system, we update the results of a previous work for this correlation function and the low-energy scattering observables. The new results show appreciable changes in some observables and should provide valuable input for comparison with the forthcoming experimental data. Such a comparison is expected to yield relevant information on the nature of the axial-vector meson states.
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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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