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  1. Neutrino oscillations at the highest energies and longest baselines can be used to study the structure of spacetime and test the fundamental principles of quantum mechanics. If the metric of spacetime has a quantum mechanical description, its fluctuations at the Planck scale are expected to introduce non-unitary effects that are inconsistent with the standard unitary time evolution of quantum mechanics. Neutrinos interacting with such fluctuations would lose their quantum coherence, deviating from the expected oscillatory flavour composition at long distances and high energies. Here we use atmospheric neutrinos detected by the IceCube South Pole Neutrino Observatory in the energy range of 0.5–10.0 TeV to search for coherence loss in neutrino propagation. We find no evidence of anomalous neutrino decoherence and determine limits on neutrino–quantum gravity interactions. The constraint on the effective decoherence strength parameter within an energy-independent decoherence model improves on previous limits by a factor of 30. For decoherence effects scaling as E2 , our limits are advanced by more than six orders of magnitude beyond past measurements compared with the state of the art. 
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    Free, publicly-accessible full text available June 1, 2025
  2. Abstract

    Neutrino flares in the sky are searched for in data collected by IceCube between 2011 and 2021 May. This data set contains cascade-like events originating from charged-current electron neutrino and tau neutrino interactions and all-flavor neutral-current interactions. IceCube’s previous all-sky searches for neutrino flares used data sets consisting of track-like events originating from charged-current muon neutrino interactions. The cascade data set is statistically independent of the track data sets, and while inferior in angular resolution, the low-background nature makes it competitive and complementary to previous searches. No statistically significant flare of neutrino emission was observed in an all-sky scan. Upper limits are calculated on neutrino flares of varying duration from 1 hr to 100 days. Furthermore, constraints on the contribution of these flares to the diffuse astrophysical neutrino flux are presented, showing that multiple unresolved transient sources may contribute to the diffuse astrophysical neutrino flux.

     
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  3. A search for hidden-charm pentaquark states decaying to a range ofΣcD¯andΛc+D¯final states, as well as doubly charmed pentaquark states toΣcDandΛc+D, is made using samples of proton-proton collision data corresponding to an integrated luminosity of5.7fb1recorded by the LHCb detector ats=13TeV. Since no significant signals are found, upper limits are set on the pentaquark yields relative to that of theΛc+baryon in theΛc+pKπ+decay mode. The known pentaquark states are also investigated, and their signal yields are found to be consistent with zero in all cases.

    © 2024 CERN, for the LHCb Collaboration2024CERN 
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    Free, publicly-accessible full text available August 1, 2025
  4. A<sc>bstract</sc>

    A search for the fully reconstructed$$ {B}_s^0 $$Bs0→ μ+μγdecay is performed at the LHCb experiment using proton-proton collisions at$$ \sqrt{s} $$s= 13 TeV corresponding to an integrated luminosity of 5.4 fb1. No significant signal is found and upper limits on the branching fraction in intervals of the dimuon mass are set$$ {\displaystyle \begin{array}{cc}\mathcal{B}\left({B}_s^0\to {\mu}^{+}{\mu}^{-}\gamma \right)<4.2\times {10}^{-8},& m\left({\mu}^{+}{\mu}^{-}\right)\in \left[2{m}_{\mu },1.70\right]\textrm{GeV}/{c}^2,\\ {}\mathcal{B}\left({B}_s^0\to {\mu}^{+}{\mu}^{-}\gamma \right)<7.7\times {10}^{-8},&\ m\left({\mu}^{+}{\mu}^{-}\right)\in \left[\textrm{1.70,2.88}\right]\textrm{GeV}/{c}^2,\\ {}\mathcal{B}\left({B}_s^0\to {\mu}^{+}{\mu}^{-}\gamma \right)<4.2\times {10}^{-8},& m\left({\mu}^{+}{\mu}^{-}\right)\in \left[3.92,{m}_{B_s^0}\right]\textrm{GeV}/{c}^2,\end{array}} $$BBs0μ+μγ<4.2×108,mμ+μ2mμ1.70GeV/c2,BBs0μ+μγ<7.7×108,mμ+μ1.70, 2.88GeV/c2,BBs0μ+μγ<4.2×108,mμ+μ3.92mBs0GeV/c2,

    at 95% confidence level. Additionally, upper limits are set on the branching fraction in the [2mμ,1.70] GeV/c2dimuon mass region excluding the contribution from the intermediateϕ(1020) meson, and in the region combining all dimuon-mass intervals.

     
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    Free, publicly-accessible full text available July 1, 2025