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
KM3NeT is a international collaboration focused on neutrino telescopy. Its main goals are to detect high energy cosmological objects through neutrino detection and reveal the neutrino mass...Show moreKM3NeT is a international collaboration focused on neutrino telescopy. Its main goals are to detect high energy cosmological objects through neutrino detection and reveal the neutrino mass hierarchy. For this it uses two detectors, the ARCA detector which is constructed on the coast of Italy and the ORCA detector which had its first two detection strings deployed in the fall of 2017. In this thesis we focus on measuring the background produced by muons generated in atmospheric events. This will allow us to gain an estimation of the expected background from which we obtain an indication of the performance of the detector. We have used two methods of filtering uncorrelated backgrounds such as the signals produced by decay of 40K in the ocean to extract atmospheric signals. Through the two methods we have found two halving lengths of muons flux in the water of the Mediterranean. A halving length of 239 meters for the method filtering low energy hits and a halving length of 267 meters for signals extracted by correlations between DOMs. The results give a good estimation of the order of magnitude of muon decay through increasing depths, however we have found systematic artifacts in the DOMs, which are expected to be caused by differences in the DOM efficiencies. For this reason further research is required to obtain a definitive result.Show less
In this work a correction was developed to compensate for the excess of triggered low pT jets in the TileGap3 (TG3) region of the ATLAS detector. Online leading jet pT is scaled down proportional...Show moreIn this work a correction was developed to compensate for the excess of triggered low pT jets in the TileGap3 (TG3) region of the ATLAS detector. Online leading jet pT is scaled down proportional to the jet energy fraction deposited in the TG3 detector. Systematic analysis shows that by doing so a 2.6% decrease of wrongly triggered low pT events is achieved if a 0.1% increase of high pT events failed to trigger on is tolerated. If an order 1% increase of failed high pT events is allowed, a 4.5% decrease of wrongly triggered low pT events is realised. Suggestions are made for further studies which ultimately may lead to the implementation of this correction in ATLAS jet triggers.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
