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Ferreira, M. N., Miramontes, A. S., Morgado, J. M., & Papavassiliou, J. (2026). Light mesons in the symmetric-vertex approximation. Eur. Phys. J. C, 86(7), 858–19pp.
Abstract: We compute the spectrum of light mesons, composed by up, down, and strange quarks, using a symmetry-preserving approximation that permits the inclusion of fully-dressed quark-gluon vertices in the key dynamical equations. This method is characterized by the use of the standard symmetric kinematic configuration as a seed in the corresponding Schwinger-Dyson equation, yielding finally the full kinematic dependence of all eight form factors composing the transversely-projected quark-gluon vertex. The extension of this approach to the case of distinct nonvanishing current quark masses is discussed, and the compatibility with the fundamental Ward-Takahashi identities demonstrated. The corresponding Bethe-Salpeter kernel is composed by three different diagrammatic structures, which may be deduced from the attendant quark gap equation by applying the standard “cutting” rules. The masses of the light mesons are computed by first determining the eigenvalue of the Bethe-Salpeter equation as a function of Euclidean momenta, and then using the Schlessinger extrapolation method to determine the Minkowski momentum for which this eigenvalue becomes unity. The resulting meson masses are in good agreement with experimental values, and substantially improve upon predictions from the rainbow-ladder approximation.
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Pietri, S. et al, & Ayet, S. (2026). Production of isotopes near the heavy-element nucleosynthesis path at FRS. Phys. Lett. B, 880, 140729–6pp.
Abstract: Neutron-rich isotopes far from stability were produced and observed at the projectile Fragment Separator (FRS) of the GSI Helmholtzzentrum f & uuml;r Schwerionenforschung in the FAIR Phase-0 experimental program. The isotopes were produced in April 2020 in the fragmentation of a 1.05 GeV/nucleon 208Pb beam on a beryllium target. The experiment targeted the neutron-rich region near the N = 126 shell closure, a key area for understanding the astrophysical r-process, but largely unexplored due to the experimental challenges in producing such exotic nuclei. Within this work, we identified five isotopes which were not seen previously at FRS; 184Tm, 195Ta, 198W, 200Re, and 201Re – the latter located directly on the N = 126 line. These observations corroborate the extension of the nuclear chart and highlight the capabilities of the FRS and of in-flight fragmentation at relativistic energies in accessing this region.
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Franco-Patino, J. M., Garcia-Marcos, J., Belocchi, V., Barbaro, M. B., Co, G., & Gonzalez-Jimenez, R. (2026). Relativistic distorted-wave analysis of the missing-energy spectrum measured with monochromatic νμ-12C interactions at JSNS2. Phys. Rev. D, 114(1), 013006–11pp.
Abstract: Recently, the JSNS2 Collaboration measured for the first time the missing-energy distribution of 12C using a monochromatic neutrino beam coming from kaon decays at rest. In this work, we present the results of an analysis of this spectrum using the relativistic distorted-wave approach. A new parametrization of the spectral function for neutrons in 12C, which incorporates detailed information from (e; e0p) experiments with high missing-energy resolution, has been used. The role of the recoil of the residual nucleus, final-state interactions, and neutrino event generators are discussed.
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Garcia Soto, A., & Niedziela, J. (2026). Observing neutrinos at CMS and ATLAS with a gaseous fixed target concept. Phys. Rev. D, 114(1), 012010–7pp.
Abstract: The SHIFT@LHC proposal introduced a novel shifted gaseous fixed-target concept at the LHC to search for exotic particles. In this article, we explore an entirely different physics opportunity enabled by this setup: the observation of neutrinos in general-purpose LHC detectors. Using simulations of proton-gas collisions, hadron propagation, and neutrino interactions, we estimate that O(10(4)) muon-neutrino and O(10(3)) electronneutrino interactions, with energies from 20 GeV to 1 TeV, would occur in the CMS and ATLAS detectors with 1% of the LHC Run-4 integrated luminosity (approximate to 4 & times; 10(25) protons on target). This unique configuration provides access to hadron production in the pseudorapidity range 5 < eta <8, complementary to existing LHC detectors. If realized, this would mark the first detection of neutrinos in a hadron collider detector, demonstrating the feasibility of such measurements in this experimental environment.
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Kasturi, V. S., Nieves, J., Sanchez, F., & Sobczyk, J. E. (2026). Exclusive hadron observables in neutrino induced 2p2h multinucleon knockout. Phys. Rev. D, 114(1), 012002–12pp.
Abstract: We explore the combined lepton and hadron kinematic observables from the exclusive Valencia 2p2h model. We present variables of interest that are available due to the exclusive kinematics and compare them with the democratically distributed outgoing nucleon kinematics as currently treated in neutrino event generators. We also show the effect of nuclear rescattering based on the NEUT semiclassical cascade. We comment on the observability of these variables in current and future long baseline neutrino detectors.
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