We discuss the phenomenology of neutrino decoupling in the early universe, by summarising the details of the calculation in standard and non-standard scenarios. We present the state-of-the-art calculation of the effective number of neutrino species in the early universe (Neff) in the three-neutrino case, which gives Neff=3.044, and show how the result can change when additional particles (such...
We will discuss multi-lepton signals of LNV that can arise with experimentally interesting rates in certain loop models of neutrino mass generation. Interestingly, in such models the observed smallness of the active neutrino masses, together with the high-multiplicity of the final states, leads in large parts of the viable parameter space to the prediction of long-lived charged particles. We...
The Daya Bay Reactor Neutrino Experiment discovered a non-zero value
for the neutrino mixing angle 𝜃13 in 2012. Since then, Daya Bay
continues to provide leading determination of this small mixing angle. This
is accomplished by comparing the measured rate and energy spectrum of
electron antineutrinos coming from three pairs of reactors between multiple
identical-designed detectors...
The Standard Model (SM) of particle physics has been very successful in explaining a wide range of experimental observations. However, it still can not address certain issues such as the non-zero neutrino masses, existence of dark matter and the baryon asymmetry of the Universe. This motivates studies beyond the SM. Among the various scenarios that have been proposed in the literature, the...
The Tokai-to-Kamioka (T2K) long-baseline neutrino experiment measures neutrino-flavor oscillation parameters using the three-flavor oscillation model parameterized by the PMNS matrix. This measurement is performed by sampling the JPARC (anti)neutrino beam by various detectors: once at a near detector complex before oscillations take place and once at a far detector after oscillations. A...
The IceCube observatory at the South Pole, with its 1km3 of instrumented ice, is one of the largest neutrino detectors worldwide. The observatory has detected the first high-energy astrophysical neutrinos and has shown compelling evidence for the first neutrino point source. The success of IceCube has matured plans for the extension of its energy range of 10GeV to PeV towards both lower and...
In 2006, A. Cohen and S. Glashow presented for the first time the idea of Very Special Relativity (VSR), where they imagined to restrict space-time invariance to a subgroup of the full Lorentz group, usually the subgroup 𝑆𝐼𝑀(2). The advantage of this theory is that, while it does not affect kinematic predictions of Special Relativity, it is able to explain the existence of neutrino masses...
MicroBooNE is a liquid argon time projection chamber (LArTPC) neutrino detector located in Fermilab. Operating from 2015 to 2020 it collected the largest number of neutrino interactions in liquid-argon to date. Its primary physics goal is to clarify the origins of the low-energy excess of electromagnetic activity observed by MiniBooNE; the first set of results on this were released during...
