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    Partikeldagarna 2026

    17–18 Sept 2026
    Lund University, Physics Department
    Europe/Stockholm timezone

    Session

    Session 7

    18 Sept 2026, 13:30
    A-salen (L317) (Lund University, Physics Department)

    A-salen (L317)

    Lund University, Physics Department

    Sölvegatan 14, Lund

    Presentation materials

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    1. 21. Multimessenger diagnostics of hadronic acceleration from PeV to EeV
      Foteini Oikonomou (NTNU)
      18/09/2026, 13:30

      The origin of high-energy cosmic rays remains one of the central open questions in astroparticle physics. In recent years, new observations of Galactic cosmic rays and gamma-rays, high-energy neutrinos, and ultra-high-energy cosmic rays have provided important clues about the astrophysical environments that can accelerate hadrons to extreme energies. In this talk, I will review recent progress...

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    2. 5. Search for neutral long-lived particles with IceCube
      Carlos Perez de los Heros
      18/09/2026, 14:15

      We present the first-ever search for Long-Lived Particles (LLPs) produced by atmospheric muons with the IceCube neutrino telescope.
      Atmospheric muons, disregarded as background in most IceCube analyses, could produce LLPs in the detector volume via an exotic muon–nucleus bremsstrahlung-like scattering, which would travel undetected for some distance before decaying back into Standard Model...

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    3. 27. The IceCube Upgrade
      Anna Obertacke (Stockholm University)
      18/09/2026, 14:30

      The IceCube Neutrino Observatory has completed its first major expansion since construction: five new, densely instrumented strings carrying next-generation optical sensors, deployed at the detector's center in the 2025/2026 Antarctic field season.

      The Upgrade lowers IceCube's energy threshold into the few GeV range, enabling improved measurements of atmospheric neutrino oscillation...

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    4. 32. Constraints on light Z' bosons and the X17 from neutrino decoupling in the early universe
      Rikard Enberg
      18/09/2026, 14:45

      The number of effective relativistic neutrino species Neff is a sensitive probe of new physics if there are new particles that couple to SM particles at the time of the neutrino decoupling, which occurs at a temperature of around MeV, one second after the Big Bang. We calculate how the existence of a light Z' boson with generic vector and axial-vector couplings to electrons and...

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