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Ramirez-Uribe, S., Renteria-Olivo, A. E., & Rodrigo, G. (2026). Quantum querying based on multicontrolled Toffoli gates for causal Feynman loop configurations and directed acyclic graphs. Phys. Rev. D, 114(7), 074038–19pp.
Abstract: Quantum algorithms are a promising framework for unfolding the causal configurations of multiloop Feynman diagrams, which is equivalent to querying the directed acyclic graph (DAG) configurations of undirected graphs in graph theory. In this paper, we present a quantum algorithm for querying in both types of applications, using a systematic and sparing logic in the design of an oracle operator. The construction of the quantum oracle is based exclusively on multicontrolled Toffoli (MCX) gates and quantum NOT (Pauli-X) gates. The efficiency of the algorithm is evaluated by comparison with a quantum algorithm based on binary clauses. Furthermore, we analyze the impact of traspilation and introduce an appropriate metric to assess the complexity of the algorithm, the quantum circuit area. We explicitly analyze three-, four- and five-eloop topologies, which have not previously been explored due to their higher complexity and the current limitations of quantum simulators.
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HAWC Collaboration(Alfaro, R. et al), & Coutiño de Leon, S. (2026). Investigating IceCube Neutrino Alerts with the HAWC Gamma-Ray Observatory. Astrophys. J., 1011(1), 1–13pp.
Abstract: Neutrino emission from astrophysical sources has long been considered a signature of cosmic-ray acceleration. The IceCube Neutrino Observatory has observed a diffuse flux of TeV-PeV neutrinos, but very few confirmed sources have emerged. With the recent publication of the IceCube Event Catalog (IceCat-1), IceCube has released a list of probable astrophysical neutrinos from 2011 May to 2020 December, with follow-up alerts released via the Astrophysical Multi-messenger Observatory Network (AMON). Using the archival data from the High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory, we search for gamma-ray outbursts spatially coincident with these neutrino alerts using a Bayesian block algorithm. In this work, we consider 380 alerts, up to 2026 May 19, that are within HAWC's field of view. We observe approximately a 5% coincident detection rate, which is consistent with expectations from background. Two of these detections contain the active galactic nuclei (AGNs) Mrk 421 and Mrk 501. We discuss the possibility of these AGNs producing the observed neutrino events when considering the HAWC results.
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Paxman, C. J. et al, Domingo-Pardo, C., Gadea, A., & Perez-Vidal, R. M. (2026). Direct transfer to 46,48K as a survey of the π(s1/2)-ν(sd p f ) interaction. Phys. Rev. C, 114(4), 044318–18pp.
Abstract: The collapse of the canonical N = 28 magic number in nuclei with Z < 20 has drawn significant interest as it relates to the emergence of an island of inversion centered on Si-42 and S-44. In particular, interactions between the pi 2s(1/2) orbital-empty in Si-42 and full in S-44-and the neutron orbitals just above and below the N = 28 gap are expected to be critical in this region, but remain relatively unexplored. In this paper, we expand upon the results of our previous study of the direct transfer reaction K-47 (d, p gamma) K-48 [Paxman et al., Phys. Rev. Lett. 134, 162504 (2025)] with the results of the complementary 47K (d, t gamma) K-46 reaction. Through this study, we present a comprehensive scan of the interaction between the pivotal pi 2s(1/2) orbital and a broad range of neutron orbitals spanning nearly two full shells; nu(2s(1/2), 1d(3/2), 1 f(7/2), 2p(3/2), 2p(1/2), 1 f(5/2)). We identify several discrepancies between the experimental results and state-of-the-art shell model calculations, which suggest a deficiency of the shell model to fully capture the complex proton configuration mixing in this region, highlighting a significant challenge for single-particle descriptions of the island of inversion.
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Granelli, A., Klaric, J., Pasari, D., Perez-Gonzalez, Y. F., & Turner, J. (2027). ULYSSES the third: An odyssey towards a unified Python toolkit for leptogenesis. Comput. Phys. Commun., 330, 110464–25pp.
Abstract: We present the third release of ULYSSES, a Python package for the numerical evaluation of the baryon asymmetry generated through leptogenesis. This version includes code implementing state-of-the-art density matrix equations for low-scale leptogenesis with three quasi-degenerate right-handed neutrinos. We extend the validity of the code in this scenario beyond the 100 GeV right-handed neutrino mass scale, into the regime of resonant leptogenesis, by including neutrino production rates valid in both the relativistic and non-relativistic regimes. In addition, in the high-scale vanilla scenario, we provide routines for computing Delta L = 1 scattering processes, enabling full phase-space evolution of the right-handed neutrino and lepton asymmetry. A new--extended parameter interface allows users to pass model-specific inputs beyond the standard leptogenesis runcard without modifying the core infrastructure and demonstrate its use with a toy module that simultaneously solves the vanilla leptogenesis equations and the freeze-in production of dark matter. On top of these improvements, we introduce an alternative parametrisation of the Casas-Ibarra matrix, update the default neutrino oscillation parameters and report cross-checks of the new low-scale leptogenesis module against published benchmarks and independent codes. ULYSSES is publicly available on GitHub https://github.com/earlyuniverse/ulyssesGithub and pip-installable from PyPI. PROGRAM SUMMARY Program title: ULYSSES CPC Library link to program files: https://doi.org/10.17632/4cvdr57t2n.1 Developer's repository link: https://github.com/earlyuniverse/ulysses Licensing provisions: MIT License Programming language: Python 3 Journal reference of previous version: Comput. Phys. Commun. 291 (2023) 108834 Does the new version supersede the previous version?: Yes Reasons for the new version: Extension of the code capabilities to include low-scale leptogenesis scenarios, complete Delta L = 1 scattering processes for high-scale leptogenesis, improved user-defined model support, and enhanced usability through a Python API and Jupyter notebook interface. Summary of revisions: Implementation of a unified treatment of low-scale leptogenesis with three right-handed neutrinos; inclusion of complete Delta L = 1 scattering processes in the leptogenesis evolution equations; addition of alternative Casas-Ibarra parametrisations; support for user-specified initial heavy-neutrino abundances; extension of the framework to accommodate custom leptogenesis models and parameters; introduction of a Python API and Jupyter notebook workflow. Nature of problem: Numerical solution of coupled Boltzmann and Density Matrix equations governing thermal, resonant, and low-scale leptogenesis, including the evaluation of computationally demanding thermal integrals and reaction rates. Solution method: The evolution equations are solved using the odeint and solve_ivp integrators available in Python. Integrals are evaluated using a Numba-accelerated wrapper around the cquadpack integration library.
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Dai, L. R., Lyu, W. T., & Oset, E. (2026). Study of the J/ψ → Λ(Σ)over-bar0 ηreaction. Chin. Phys. C, 50(11), 113106–8pp.
Abstract: We study the isospin-violating J/psi -> Lambda(Sigma) over bar (0)eta reaction, recently measured by the BESIII collaboration, by considering the dominant terms involving (Sigma) over bar (0) and pairs of pseudoscalar-baryon particles that together form an SU(3) singlet and can therefore couple to the . We then allow these pairs to undergo final-state interaction to produce J/psi the final . We find that the relevant original channels are and , and that the incomplete cancellation of KN and K Xi and terms involving charged and neutral particles, owing to their different masses, is responsible for the reaction. With this mechanism, we find good agreement with the three experimental mass distributions.
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