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Algora, A. et al, Agramunt, J., Tain, J. L., Garcia Cabrera, H., & Victoria, J. A. (2025). Study of the Beta Spectrum Shape of 92Rb and 142Cs Decays for the Prediction of Reactor Antineutrino Spectra. Phys. Rev. Lett., 135(14), 142502–10pp.
Abstract: The shapes of the beta spectra of 92Rb and 142Cs, two of the beta decays most relevant for the prediction of the antineutrino spectrum in reactors, have been measured. A new setup composed of two Delta E-E telescopes has been used. High-purity radioactive beams of the isotopes of interest were provided by the IGISOL facility using the JYFLTRAP double Penning trap. The resulting beta spectra have been compared with model predictions using beta decay feedings from total absorption gamma spectroscopy measurements and shape corrections employed in the calculation of the antineutrino spectrum, corroborating both further. The procedure can be extended to other relevant nuclei in the future, providing solid ground for the prediction of the antineutrino spectrum in reactors.
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Inostroza, C., Kondrashuk, I., Merino, N., & Nadal, F. (2025). A Java Library to Perform S-Expansions of Lie Algebras. Axioms, 14(10), 735–55pp.
Abstract: The contraction method is a procedure that allows to establish non-trivial relations between Lie algebras and has had successful applications in both mathematics and theoretical physics. This work deals with generalizations of the contraction procedure, with a main focus on the so-called S-expansion method, as it includes most of the other generalized contractions. Basically, the S-expansion combines a Lie algebra G with a finite abelian semigroup S in order to define new S-expanded algebras. After giving a description of the main ingredients used in this paper, we present a Java library that automates the S-expansion procedure. With this computational tool, we are able to represent Lie algebras and semigroups, so we can perform S-expansions of Lie algebras using arbitrary semigroups. We explain how the library methods have been constructed and how they work; then, we give a set of example programs aimed to solve different problems. They are presented so that any user can easily modify them to perform their own calculations, without necessarily being an expert in Java. Finally, some comments about further developments and possible new applications are made.
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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). Search for cascade decays of charged sleptons and sneutrinos in final states with three leptons and missing transverse momentum in pp collisions at √s=13 TeV with the ATLAS detector. Phys. Rev. D, 112(1), 012005–41pp.
Abstract: A search for cascade decays of charged sleptons and sneutrinos using final states characterized by three leptons (electrons or muons) and missing transverse momentum is presented. The analysis is based on a dataset with 140 fb(-1) of proton-proton (pp) collisions at a center-of-mass energy of root s = 13 TeV recorded by the ATLAS detector at the Large Hadron Collider. This paper focuses on a supersymmetric scenario that is motivated by the muon anomalous magnetic moment observation, dark-mattter relic density abundance, and electroweak naturalness. A mass spectrum involving light Higgsinos and heavier sleptons with a bino at intermediate mass is targeted. No significant deviation from the Standard Model expectation is observed. This search enables us to place stringent constraints on this model, excluding at the 95% confidence level charged slepton and sneutrino masses up to 450 GeV when assuming a lightest neutralino mass of 100 GeV and mass-degenerate selectrons, smuons and sneutrinos.
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Cornet-Gomez, F., Miralles, V., Miralles Lopez, M., Moreno Llacer, M., & Vos, M. (2025). Future collider constraints on top-quark operators. J. High Energy Phys., 10(10), 156–44pp.
Abstract: In this paper we present updated constraints on the top-quark sector of the Standard Model Effective Field Theory using data available from Tevatron, LEP and the LHC. Bounds are obtained for the Wilson coefficients from a global fit including the relevant two-fermion operators, four-quark operators and two-quark two-lepton operators. We compare the current bounds with the prospects for the high luminosity phase of the Large Hadron Collider and future lepton colliders.
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Antonova, M., Capo, J., Cervera, A., Fernandez, P., Garcia-Peris, M. A., & Pons, X. (2026). Millikelvin-precision temperature sensing for advanced cryogenic detectors. Nucl. Instrum. Methods Phys. Res. A, 1082, 171062–13pp.
Abstract: Precise temperature monitoring-to the level of a few millikelvin-is essential for the operation of large-scale cryostats requiring a recirculation system. In particular, the performance of Liquid Argon Time Projection Chambers-such as those planned for the DUNE experiment-strongly relies on proper argon purification and mixing, which can be characterized by a sufficiently dense grid of high-precision temperature probes. In this article, we describe the key components of a novel temperature monitoring system developed for a prototype of the DUNE experiment. In particular, a new technique for the cross-calibration of Resistance Temperature Detectors in cryogenic liquids will be presented in detail. This calibration has enabled the validation and optimization of the system's components, achieving an unprecedented relative precision better than 3 mK.
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