Sources of astrophysical neutrinos can potentially be discovered through the detection of neutrinos in coincidence with electromagnetic counterparts. Real-time alerts generated by IceCube play an ...important role in this search, acting as triggers for follow-up observations with instruments sensitive to electromagnetic signals in various wavelengths. In previous studies, we investigated the treatment of the systematic uncertainties on the reconstruction method currently used in IceCube's real-time program, concluding that a new approach, more robust against systematic variations, is needed. Here we present the state-of-the-art of these analyses, and discuss a modification to an already-existing and reliable reconstruction method that results in an improved solution under many metrics. The proposed reconstruction method is faster, more precise, and significantly less influenced by systematic uncertainties, than the current one. This system provides a more robust estimate of angular uncertainties than the previous algorithm, making it a solid benchmark for real-time event analyses.
Searches for dark matter (DM) have not provided any solid evidence for the existence of weakly interacting massive particles in the GeV-TeV mass range. Coincidentally, the scale of new physics is ...being pushed by collider searches well beyond the TeV domain. This situation strongly motivates the exploration of DM masses much larger than a TeV. Secluded scenarios contain a natural way around the unitarity bound on the DM mass, via the early matter domination induced by the mediator of its interactions with the Standard Model. High-energy neutrinos constitute one of the very few direct accesses to energy scales above a few TeV. An indirect search for secluded DM signals has been performed with the ANTARES neutrino telescope using data from 2007 to 2015. Upper limits on the DM annihilation cross section for DM masses up to 6 PeV are presented and discussed.
Phys. Rev. Lett. 129 (2022) 1, 011804 We report a search for nonstandard neutrino interactions (NSI) using eight
years of TeV-scale atmospheric muon neutrino data from the IceCube Neutrino
...Observatory. By reconstructing incident energies and zenith angles for
atmospheric neutrino events, this analysis presents unified confidence
intervals for the NSI parameter $\epsilon_{\mu \tau}$. The best-fit value is
consistent with no NSI at a p-value of 25.2%. With a 90% confidence interval of
$-0.0041 \leq \epsilon_{\mu \tau} \leq 0.0031$ along the real axis and similar
strength in the complex plane, this result is the strongest constraint on any
NSI parameter from any oscillation channel to date.
