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Cerdeira, J. L. V., & Ortin, T. (2025). On-shell Lagrangians as total derivatives and the generalized Komar charge. J. High Energy Phys., 09(9), 068–17pp.
Abstract: Lagrangians which transform homogeneously under a global transformation of the fields (a global rescaling, for instance) can be written on-shell as a total derivative which has a universal, solution-independent expression, using a functional version of the Euler theorem for homogeneous functions. We study the uniqueness of this expression and how this result can be used in the construction of generalized Komar charges.
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Babeluk, M. et al, Lacasta, C., Marinas, C., Mazorra de Cos, J., Molina-Bueno, L., & Vobbilisetti, V. (2025). OBELIX: A monolithic pixel sensor with triggered readout for the Belle II upgrade. Nucl. Instrum. Methods Phys. Res. A, 1080, 170654–4pp.
Abstract: The Upgrade of the Belle II vertex detector (VTX) at the SuperKEKB accelerator in Japan is foreseen to improve tracking performance at the expected high beam backgrounds at target luminosity of 6 x 1035 cm-2s-1. The OBELIX-1 chip is specifically developed for this purpose and used as sensor on all VTX layers. OBELIX-1 is a depleted monolithic active pixel sensor in 180 nm technology. The pixel matrix is inherited from TJ-Monopix2, but the periphery of the chip is entirely reworked. A newly designed 2-stage pixel memory matches Belle II trigger requirements. OBELIX-1 includes LDO regulators and a precision timing module with less than 3 ns resolution. Furthermore, the chip can also contribute to the Belle II trigger system with low latency, low granularity real-time streaming of pixel data in parallel to regular operation. Details of the inner working of the trigger memory are presented, as well as performance simulations to validate the requirements for the VTX Upgrade. The trigger memory has been studied in simulation using realistic scenarios, including Landau distributed charge and clustering to evaluate performance. In order to allow post-production testing, an additional module is presented. This allows the injection of pseudo-random data early in the processing chain, and replaces the need for industry standard scan-chains. It can be used stand-alone or during analog charge injection, in order to reach the full trigger memory during testing.
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Afik, Y. et al, & Vos, M. (2025). Quantum information meets high-energy physics: input to the update of the European strategy for particle physics. Eur. Phys. J. Plus, 140(9), 855–14pp.
Abstract: Some of the most astonishing and prominent properties of Quantum Mechanics, such as entanglement and Bell nonlocality, have only been studied extensively in dedicated low-energy laboratory setups. The feasibility of these studies in the high-energy regime explored by particle colliders was only recently shown and has gathered the attention of the scientific community. For the range of particles and fundamental interactions involved, particle colliders provide a novel environment where quantum information theory can be probed, with energies exceeding by about 12 orders of magnitude those employed in dedicated laboratory setups. Furthermore, collider detectors have inherent advantages in performing certain quantum information measurements and allow for the reconstruction of the state of the system under consideration via quantum state tomography. Here, we elaborate on the potential, challenges, and goals of this innovative and rapidly evolving line of research and discuss its expected impact on both quantum information theory and high-energy physics.
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Hellgren, M., Papoulias, D. K., & Suhonen, J. (2025). Inelastic neutrino-nucleus scattering off 203/205Tl in terms of the nuclear recoil energy using a hybrid nuclear model. Phys. Lett. B, 868, 139624–7pp.
Abstract: Nuclear structure calculations in the context of a novel hybrid nuclear model, combining the nuclear shell model and the microscopic quasiparticle-phonon model are presented. The predictivity of the hybrid model is tested by computing inelastic neutral-current neutrino-nucleus scattering cross sections off the stable thallium isotopes. The cross sections are presented in terms of the incoming neutrino energy, taking also into account the effect of nuclear recoil energy. Also reported are the expected event rates assuming neutrinos emerging from pion-decay at rest and the diffuse supernova neutrino background. Regarding solar neutrino rates, new results are presented in the context of the hybrid model and compared with previously reported results based solely on nuclear shell model calculations, demonstrating the improved accuracy of the adopted hybrid model at higher neutrino energies.
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ISOLDE Decay Station Collaboration(Mist, J. et al), Algora, A., & Nacher, E. (2025). β- and α-decay spectroscopy of 182Au. Phys. Rev. C, 112(2), 024328–16pp.
Abstract: An alpha- and beta-decay study of a pure source of laser-ionized and mass-separated 182Au (Z = 79, N = 103) was carried out at the ISOLDE Decay Station at the ISOLDE-CERN facility. Detailed gamma-gamma analysis following EC/beta+ decay of 182Au was performed, and the level scheme of daughter nuclide 182Pt was considerably extended via the identification of 125 new levels and 336 new gamma-ray transitions. The nonexistence of a relatively long-lived isomeric state in 182Au and influence of the pandemonium effect on beta-decay feeding intensities are discussed. Differences in feeding for two coexisting bands in 182Pt were investigated. The alpha-decay scheme of 182Au was extended and an alpha-decay branching ratio of 0.129(11)% was measured. Hindrance factors for alpha-decay branches were calculated and I pi = (1+, 2+, 3+) assignment for the 178Ir ground state was proposed.
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