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ATLAS Collaboration(Aad, G. et al), Aikot, A., Amos, K. R., Bouchhar, N., Cabrera Urban, S., Cantero, J., et al. (2025). Software and computing for Run 3 of the ATLAS experiment at the LHC. Eur. Phys. J. C, 85(3), 234–117pp.
Abstract: The ATLAS experiment has developed extensive software and distributed computing systems for Run 3 of the LHC. These systems are described in detail, including software infrastructure and workflows, distributed data and workload management, database infrastructure, and validation. The use of these systems to prepare the data for physics analysis and assess its quality are described, along with the software tools used for data analysis itself. An outlook for the development of these projects towards Run 4 is also provided.
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Zeng, Q. B. et al, & Morales, A. I. (2025). β-Decay Half-Lives of Neutron-Rich Sulfur to Potassium: Evolution of the N=32 and 34 Subshell Closures below Calcium. Phys. Rev. Lett., 135(23), 232501–7pp.
Abstract: The half-lives of 24 isotopes ranging from sulfur to potassium were measured using the ZeroDegree Advanced Decay Station at the Radioactive Isotope Beam Factory, including six of the most neutron-rich -47S, 48;49Cl, 51;52Ar, 55K-for the first time, while the precision for 48Ar and 53;54K was significantly improved. Two prominent features are found: First, a half-life drop at 54K35 relative to 52;53K, supporting the persistence of the N = 34 subshell closure in potassium with Z = 19. Second, a high /3-decay rate for 48Cl31 compared to 47Cl and 49Cl, which can be explained by the critical role of the nu 1p1=2 orbital in shell-model calculations. The present calculations indicate that the N = 32 subshell gap in chlorine with Z = 17 is slightly smaller than that in calcium (Z = 20), and the significant excitation across the N = 32 subshell in 48Cl31 is mainly due to strong configuration mixing.
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Eberhart, A., Fedele, M., Kahlhoefer, F., Ravensburg, E., & Ziegler, R. (2025). Leptophilic ALPs in laboratory experiments. J. High Energy Phys., 12(12), 055–46pp.
Abstract: We study the collider phenomenology of leptophilic axion-like particles (ALPs), i.e. pseudoscalar particles that couple only to charged leptons. Loops of charged leptons induce effective interactions of the ALPs with photons, which depend on the momenta of the interacting particles and differ between pseudoscalar and derivative lepton couplings. We systematically discuss the form of the interaction with photons for general external momenta and identify the regimes when it can be safely approximated by an effective coupling constant. We use these results to derive novel constraints from LEP and calculate state-of-the-art limits from E137 and NA64 for four different scenarios, in which the ALPs couple either to a single lepton generation or universally to all, for both pseudoscalar and derivative lepton couplings. We collect complementary bounds from astrophysics, flavour, and other laboratory experiments to chart the allowed parameter space of leptophilic ALPs in the MeV-GeV mass range.
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KM3NeT Collaboration(Aiello, S. et al), Alves Garre, S., Bariego-Quintana, A., Calvo, D., Carretero, V., Cecchini, V., et al. (2025). Addendum: Measurement of neutrino oscillation parameters with the first six detection units of KM3NeT/ORCA. J. High Energy Phys., 10(10), 041–6pp.
Abstract: In this short note, references to data and analysis software to reproduce the results of the paper are given.
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ATLAS Collaboration(Aad, G. et al), Aikot, A., Amos, K. R., Aparisi Pozo, J. A., Bailey, A. J., Bouchhar, N., et al. (2025). Measurements of W+W- production cross-sections in pp collisions at √s=13 TeV with the ATLAS detector. J. High Energy Phys., 08(8), 142–66pp.
Abstract: Measurements of W+W- -> e(+/-)nu mu(-/+)nu production cross-sections are presented, providing a test of the predictions of perturbative quantum chromodynamics and the electroweak theory. The measurements are based on data from pp collisions at root s = 13 TeV recorded by the ATLAS detector at the Large Hadron Collider in 2015-2018, corresponding to an integrated luminosity of 140 fb(-1). The number of events due to top-quark pair production, the largest background, is reduced by rejecting events containing jets with b-hadron decays. An improved methodology for estimating the remaining top-quark background enables a precise measurement of W+W- cross-sections with no additional requirements on jets. The fiducial W+W- cross-section is determined in a maximum-likelihood fit with an uncertainty of 3.1%. The measurement is extrapolated to the full phase space, resulting in a total W+W- cross-section of 127 +/- 4 pb. Differential cross-sections are measured as a function of twelve observables that comprehensively describe the kinematics of W+W- events. The measurements are compared with state-of-the-art theory calculations and excellent agreement with predictions is observed. A charge asymmetry in the lepton rapidity is observed as a function of the dilepton invariant mass, in agreement with the Standard Model expectation. A CP-odd observable is measured to be consistent with no CP violation. Limits on Standard Model effective field theory Wilson coefficients in the Warsaw basis are obtained from the differential cross-sections.
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