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Collar, J. I., Esteban, I., Gomez-Cadenas, J. J., Gonzalez-Garcia, M. C., Ji, L., Larizgoitia, L., et al. (2026). Coherent elastic neutrino-nucleus scattering at the Japan Proton Accelerator Research Complex. J. High Energy Phys., 05(5), 106–44pp.
Abstract: The Japan Proton Accelerator Research Complex (J-PARC) currently delivers a 1 MW, 3 GeV proton beam to the Materials and Life Science Experimental Facility (MLF). Power is expected to increase to 1.3 MW, driven by the needs of Hyper-Kamiokande. As a result, the MLF presently provides the highest neutron yield of any spallation source, while potentially holding the best current and foreseeable conditions for Coherent Elastic Neutrino-Nucleus Scattering (CE nu NS) experimentation. We explore this potential, using as examples detector technologies presently funded for construction and under development. We quantify their sensitivity to a rich variety of particle physics scenarios, finding that very-high-statistics CE nu NS measurements with significant sensitivity to relevant scenarios are feasible at this facility within the next few years.
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KM3NeT Collaboration(van Haren, H. et al), Alves Garre, S., Bariego-Quintana, A., Calvo, D., Cecchini, V., Garcia Soto, A., et al. (2026). Whipped and Mixed Warm Clouds in the Deep Sea. Geophys. Res. Lett., 53(2), e2025GL119998–13pp.
Abstract: Turbulence is indispensable to redistribute nutrients for all life forms larger than microbial, on land and in the ocean. Yet, the development of deep-sea turbulence was not studied in three dimensions to date. As a disproportionate laboratory, an array of nearly 3,000 high-resolution temperature sensors had been installed for three years on the flat 2,500-m deep bottom of the Mediterranean Sea. The time series from the half-cubic hectometer mooring-array allows for the creation of unique movies of deep-sea water motions. Although temperature differences are typically 0.001 degrees C, variable convection-turbulence is observed as expected from geothermal heating through the flat seafloor. During about 40% of the time, an additional turbulence, 3 times stronger in magnitude, is observed from slantwise advected warmer waters to pass in turbulent clouds. Besides turbulent clouds and seafloor heating, movies also reveal weakly turbulent interfacial-wave breakdown that commonly occurs in the open ocean far away from boundaries.
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DUNE Collaboration(Abbaslu, S. et al), Amar Es-Sghir, H., Amedo, P., Barenboim, G., Benitez Montiel, C., Capo, J., et al. (2026). Measurement of exclusive π+-argon interactions using ProtoDUNE-SP. Phys. Rev. D, 113(11), 112002–21pp.
Abstract: We present the measurement of pi(+)-argon inelastic cross sections using the ProtoDUNE single-phase liquid argon time projection chamber in the incident pi(+) kinetic energy range of 500-800 MeV in multiple exclusive channels (absorption, charge exchange, and the remaining inelastic interactions). The results of this analysis are important inputs to simulations of liquid argon neutrino experiments such as the Deep Underground Neutrino Experiment and the Short Baseline Neutrino program at Fermi National Accelerator Laboratory. They will be employed to improve the modeling of final state interactions within neutrino event generators used by these experiments, as well as the modeling of pi(+)-argon secondary interactions within the liquid argon. This is the first measurement of pi(+)-argon absorption at this kinetic energy range as well as the first ever measurement of pi(+)-argon charge exchange.
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LHCb Collaboration(Aaij, R. et al), Fernandez Casani, A., Jaimes Elles, S. J., Jashal, B. K., Libralon, S., Lucio Martinez, M., et al. (2026). Measurement of the Top-Quark Production Cross Section and Charge Asymmetry at LHCb. Phys. Rev. Lett., 136(22), 221801–15pp.
Abstract: The first measurements of the top- and antitop-quark differential production cross sections and the top-quark charge asymmetry in the forward region are presented, using proton-proton collision data collected by the LHCb experiment at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 5.4 fb(-1). The total production cross sections of top and antitop quarks are also determined. Measurements are performed using the μ+ b-jet final state within a fiducial region defined by b-jet p(T, jet) > 50 GeV and pseudorapidity 2.2 < eta(jet) < 4.0, with the muon from the W-boson decay required to have p(T, mu) > 25 GeV and 2.0 < eta(mu) < 4.5. The muon and b-jet system must satisfy p(T)(mu + jet) > 20 GeV. The measured integrated production cross sections for the top and antitop quarks are sigma(t) = 0.95 +/- 0.04 +/- 0.08 +/- 0.02 pb, sigma((t) over bar) = 0.81 +/- 0.03 +/- 0.07 +/- 0.02 pb, where the first uncertainty is statistical, the second systematic, and the third accounts for the luminosity uncertainty. The top-quark charge asymmetry is measured to be A(C)(t) = 0.08 +/- 0.03 +/- 0.01, where the first uncertainty is statistical and the second is systematic. These results are consistent with next-to-leading order Standard Model predictions.
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Kozakova, J. et al, Bernabeu, P., Lacasta, C., Solaz, C., & Soldevila, U. (2026). Evaluation of performance of the p-stop fabrication process variations in ATLAS18 strip sensors, pre-and post-irradiation. Nucl. Instrum. Methods Phys. Res. A, 1091, 171783–7pp.
Abstract: The High-Luminosity upgrade of the Large Hadron Collider (HL-LHC) requires the replacement of the ATLAS Inner Detector with a new all-silicon Inner Tracker (ITk). Radiation-hard n+-in-p micro-strip sensors were developed for use in the ITk. During quality control (QC) and quality assurance (QA) procedures performed on ATLAS18 production sensors and test chips, ATLAS ITk strip sensor institutes identified instances of low p-stop density in certain production batches. To investigate the origin of these issues and to try some technological improvements, two dedicated sample batches with four variations of the p-stop fabrication process were produced. These process types (1-4) were systematically evaluated to determine their effectiveness and uniformity. In total, 56 full-size sensors, along with numerous miniature sensors and test chips, were tested. A number of samples were used in the irradiation campaign reaching the maximum expected levels for the HL-LHC operation after 10 years – with neutrons up to 1.6 & times; 1015 neq/cm2, and with gamma rays from a 60Co source up to 66 Mrad. The goal of this evaluation program is to assess the impact of p-stop fabrication process variations on interstrip isolation performance and to provide feedback for future sensor development. This paper describes the applied test procedures and presents the corresponding results, which demonstrate good sensor performance for all investigated p-stop types. The findings confirm the reliability of the evaluated designs and identify specific advantages that can inform further optimization of strip sensor fabrication.
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