In this thesis I describe the workings of the SND@LHC, a newly approved experiment at the Large Hadron Collider in Geneva, Switzerland. I describe how the detector works, I derive an expression for...Show moreIn this thesis I describe the workings of the SND@LHC, a newly approved experiment at the Large Hadron Collider in Geneva, Switzerland. I describe how the detector works, I derive an expression for the NC/CC ratio, and show how measuring it can reduce the parameter space of BSM models.Show less
This project is part of the research of the KM3NeT neutrino detector located in the Mediterranean Sea and which is currently under construction. Calibration of the detector is of utmost importance...Show moreThis project is part of the research of the KM3NeT neutrino detector located in the Mediterranean Sea and which is currently under construction. Calibration of the detector is of utmost importance as it has to reconstruct particle tracks as accurately as possible. It is shown that mispointing, i.e. the detector not having a perfectly aligned coordinate system, leads to artifacts in the data. The pointing accuracy can be cross-checked by the Moon and the Sun. Evaluation of event densities around the regions of the Moon and the Sun with the current ORCA-6 data concludes that deficits of events could not yet be significantly detected. Investigations of the background event densities showed that the background has statistical fluctuations that are consistent within the 2 sigma range. Further investigation of the background event density slope leads to the result of a linear line being a better fit to the background than a flat line.Show less
The research collaboration KM3NeT is currently constructing neutrino telescopes at two sites in the Mediterranean Sea. The pointing accuracy of these two telescopes is of high importance to be able...Show moreThe research collaboration KM3NeT is currently constructing neutrino telescopes at two sites in the Mediterranean Sea. The pointing accuracy of these two telescopes is of high importance to be able to trace detected neutrinos back to their cosmic sources. Pointing can be cross checked with the cosmic ray shadow of the moon respectively the sun. In this research first the effects of mispointing of the KM3NeT/ORCA detector on the 2D map of the moon were evaluated. It is shown how various mispointing does in fact distort the 2D-map of a celestial object. Secondly the first six months of data with 4 lines of the KM3NeT/ORCA detector were used to investigate the cosmic ray shadow from both the sun and the moon. Extrapolated simulations for a year show that the statistics are currently not sufficient for a significant deficit of particles in the neighbourhood of the moon and the sun. In the analysis of the ORCA4 data the background of the moon and sun signal was evaluated using fake sources, following the path of the moon and with a given time delay. The background showed significant differences between different fake sources and also could be shown to behave differently for the moon and the sun. Further research is needed to investigate the discovered features and be able to recover the signal from the moon and sun shadowsShow less
We look for cosmic neutrinos originating in Gamma Ray bursts using public data from the IceCube collaboration. We allow for a time difference between a neutrino and GRB photon of up to 40 days to...Show moreWe look for cosmic neutrinos originating in Gamma Ray bursts using public data from the IceCube collaboration. We allow for a time difference between a neutrino and GRB photon of up to 40 days to probe possible Lorentz invariance violations. These violations might become visible if a neutrino has high enough energy and traveled a long enough distance before we observe it. We make use of pseudo experiments to simulate different possible neutrino realizations and see how well a signal can be discerned from background. We find slightly less neutrinos than expected from background in the IceCube data. A signal associated with more than 3% of the GRBs can be excluded at 98% confidence in the northern hemisphere, and at 70% confidence in the southern hemisphere. Under the assumption that the highest energy neutrinos that can be associated to a GRB are experiencing LIV induced time shifts we have derived an intrinsic time difference at emission between GRB neutrinos and photons of ∆tin = (4.49 ± 23.0) 10^4s, and a LIV scale of ELIV = (1.05 ± 0.85) 10^15GeV, while the probability of finding similar results from purely uncorrelated events is P = 54%.Show less
Currently still under construction, the KM3NeT neutrino telescope in the Mediterranean Sea will be used to detect atmospheric and cosmic neutrinos. KM3NeT will consist of large cubic arrays of...Show moreCurrently still under construction, the KM3NeT neutrino telescope in the Mediterranean Sea will be used to detect atmospheric and cosmic neutrinos. KM3NeT will consist of large cubic arrays of large amounts of optical sensors. The detector will exploit Cherenkov radiation emitted by energetic secondary particles. To have an understanding of the performance of the detector, knowing about the performance of the different digital optical modules (DOMs) is vital. Using various methods (mainly potassium decay, 40K -> 40Ca), relative sensitivities of the different DOMs have been measured. However, only rough estimates for absolute efficiencies are known. A novel method will be developed to cross check the results previously found. This research will exploit atmospheric muons and probe the sensitivity of the KM3NeT neutrino telescope. Events in which multiple DOMs in a row detect a muon are used. Both threefold and fourfold combinations are used. Ratios are introduced to describe the fraction of times all DOMs are hit over the outer DOMs. This scales with efficiency. Simulations are used to describe extinction and propagation of Cherenkov photons and muons in water.Show less
The KM3NeT/ORCA experiment will use part of the detector which is currently being built in the Mediterranean Sea to determine the neutrino mass hierarchy by measuring the pattern of atmospheric...Show moreThe KM3NeT/ORCA experiment will use part of the detector which is currently being built in the Mediterranean Sea to determine the neutrino mass hierarchy by measuring the pattern of atmospheric neutrino oscillations. In this thesis, in addition to the neutrino oscillations in the Earth, the oscillations in the atmosphere have been included in the simulations and the impact of the atmosphere on the measurements has been evaluatedShow less
In this report, the possibilities of identifying a specific t neutrino signature using KM3NeT, a neutrino telescope with an instrumented volume of multiple cubic kilometers, are investigated. When...Show moreIn this report, the possibilities of identifying a specific t neutrino signature using KM3NeT, a neutrino telescope with an instrumented volume of multiple cubic kilometers, are investigated. When uniquely identified, these neutrinos can offer a unique view on the universe with little to no background. We study the ‘Double Bang’ signature of the t neutrino interaction and reconstruct these events with a reconstruction algorithm designed for single showers. Using this algorithm, the two particle showers in this event are reconstructed as a single shower. By looking at the differences in reconstruction performance between these events and single shower events, a first indication of the relevant parameters for the identification of t neutrinos is given.Show less
