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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). Differential decay rate of B+ → J/ψK+ with the LHCb Upgrade I experiment. J. High Energy Phys., 04(4), 170–30pp.
Abstract: The normalised decay rate of B+ -> J/psi(-> mu(+) mu(-))K+ is measured as a function of the lepton helicity angle using a data sample corresponding to an integrated luminosity of 1.1 fb(-1) collected during October 2024 with the upgraded (Upgrade I) LHCb detector. This angular distribution can be parameterised by two coefficients, the forward-backward asymmetry, A(FB), and the flatness parameter, F-H, whose values are constrained by conservation of angular momentum. These coefficients are measured both integrated and differentially across various kinematic and detector-response variables, and the results are found to be in good agreement with expectations. These measurements show that the detector response of the LHCb Upgrade I experiment is understood to the precision required to reliably extract the angular coefficients associated with rare b -> s mu(+) mu(-) and b -> d mu(+) mu(-) transitions, which are particularly sensitive to physics beyond the Standard Model.
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Flavour Lattice Averaging Group(Aoki, Y. et al), Hernandez, P., & Ramos, A. (2026). FLAG review 2024. Phys. Rev. D, 113(1), 014508–287pp.
Abstract: We review lattice results related to pion, kaon, D-meson, B-meson, and nucleon physics with the aim of making them easily accessible to the nuclear and particle physics communities. More specifically, we report on the determination of the light-quark masses, the form factor f(+)(0) arising in the semileptonic K -> pi transition at zero momentum transfer, as well as the decay-constant ratio f(K)/f(pi) and its consequences for the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements V-us and V-ud. We review the determination of the B-K parameter of neutral kaon mixing as well as the additional four B parameters that arise in theories of physics beyond the Standard Model. For the heavy-quark sector, we provide results for m(c) and m(b) as well as those for the decay constants, form factors, and mixing parameters of charmed and bottom mesons and baryons. These are the heavy-quark quantities most relevant for the determination of CKM matrix elements and the global CKM unitarity-triangle fit. We review the status of lattice determinations of the strong coupling constant alpha(s). We review the determinations of nucleon charges from the matrix elements of both isovector and flavor-diagonal axial, scalar and tensor local quark bilinears, and momentum fraction, helicity moment and the transversity moment fromone-link quark bilinears. We also reviewdeterminations of scale-setting quantities. Finally, in this review we have added a new section on the general definition of the low-energy limit of the Standard Model.
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Perez-Curbelo, J., Carvalho, C. M., Schafasand, M., Rossomme, S., Llosa, G., & Grevillot, L. (2026). Assessing the delivery error detection sensitivity of a new 2D detector prototype for carbon ion PSQA measurements. J. Appl. Clin. Med. Phys, 27(5), e70580–6pp.
Abstract: Background Particle therapy requires stringent patient-specific quality assurance (PSQA) to validate dose distributions delivered by the system. Purpose This study presents preliminary results on the performance evaluation of the MatriXX AiR 2D ionization-chamber array for patient-specific QA (PSQA) in carbon-ion therapy, comparing measured and planned dose distributions. Methods A series of 10 test cases, including a treatment plan for a box-shaped target (6-cm side length), uniformly covered by the dose and nine patient-specific treatment plans, were assessed. Measurements were conducted at two water equivalent depths using RW3 phantoms: beam entrance and within the Spread-Out Bragg Peak (SOBP). The study examined the detector's ability to detect deviations by systematically modifying treatment plans, comparing the measured and planned dose utilizing gamma index analysis. Results Passing rate analysis revealed depth-dependent sensitivity to treatment plan delivery modifications. Measurements at the entrance depth showed better sensitivity to delivery changes than those taken within the SOBP Conclusions The MatriXX AiR detector demonstrated strong potential for PSQA in carbon ion therapy. These findings support its application in clinical workflows to enhance treatment verification and accuracy.
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n_TOF Collaboration(Martinez-Cañadas, M. A. et al), Torres-Sanchez, P., Babiano-Suarez, V., Caballero, L., Domingo-Pardo, C., Ladarescu, I., et al. (2026). Measurement of the 35Cl(n, p)35S cross-section at the CERN n_TOF facility from subthermal energy to 120 keV. Eur. Phys. J. A, 62(5), 90–15pp.
Abstract: The Cl-35(n, p)S-35 reaction plays a key role in neutron dosimetry for Boron Neutron Capture Therapy, in the synthesis of the isotope S-36, whose astrophysical origin remains unresolved, and in the design of next-generation molten-salt reactors. Its relevance has motivated its inclusion in the High Priority Request List (HPRL) of NEA. The goal of this work is to determine the Cl-35(n, p)S-35 cross-section from thermal energy to 120 keV for the first time ever in a single measurement, thus reducing systematic uncertainties related to the normalization to the thermal value. This had been a subject of concern in previous evaluations of this reaction. We made use of the Time-of-Flight technique with microMEGAS detectors at Experimental Area 2 (EAR-2) of n_TOF facility at CERN. The B-10 (n , alpha)Li-7 and U-235(n, f) reactions were used as references. Rutherford Back-scattering Spectrometry was performed at Centro Nacional de Aceleradores (CNA) in Sevilla, in order to accurately determine the masses of the irradiated samples. We obtained a thermal cross-section of 0.470 +/- 0.009 barns. The 1/v energy dependence of the cross-section is observed up to the first resonance at 0.398 keV, the resonances up to 120 keV are analyzed and resonance parameters extracted using SAMMY. Maxwellian Averaged Cross-Section (MACS) was calculated for k(B)T from 1 to 100 keV, and lower values compared to estimations from ENDF were found, e.g., 1.07 +/- 0.20 mb at k(B)T = 30 keV. The thermal cross-section and first two resonances are in agreement with the latest evaluation in ENDF/B-VIII.1, while remarkably lower resonance strengths were found for high energy resonances.
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Bruni, G., Bassani, L., Alves Garre, S., Molina, M., Malizia, A., Fiocchi, M., et al. (2026). 3C 403: a candidate neutrino-emitting radio galaxy. J. Cosmol. Astropart. Phys., 05(5), 007–20pp.
Abstract: 3C 403 is a well-known FRII radio galaxy with jets extending up to kiloparsec scales. We report its identification as the second most significant candidate among more than 150 sources examined using the 15-year neutrino dataset from the ANTARES collaboration, making it one of the most promising radio-galaxy candidates for high-energy neutrino emission. Motivated by previous associations between blazars and neutrino events, we investigated the jet properties of 3C 403 and their possible role in neutrino production. Multi-scale radio observations, from parsec to kiloparsec scales, reveal a stable, twosided jet lying close to the plane of the sky, with no evidence of strong Doppler boosting, while X-ray data indicate a dominant, heavily absorbed accretion-related component. We also examined the recently proposed correlation between neutrino and hard X-ray fluxes – originally identified in blazars and Seyfert galaxies – and find that 3C 403 occupies an intermediate location in the L nu-LhX plane between jet-dominated and corona-dominated systems. However, the current upper limit on its neutrino flux prevents a firm assessment of whether it follows the proposed relation. With radiatively efficient accretion (lambda Edd similar to 10-2), strong hard X-ray emission, and a powerful but misaligned jet, 3C 403 provides a physically motivated laboratory for exploring the interplay between coronal activity and jet environments in multimessenger scenarios of neutrino production in active galaxies.
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