A study of neutrino oscillations in MINOS

Raufer, T. M.

doi:10.2172/919082

Cited by 7 publications

(19 citation statements)

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“…In a previous analysis [142], it was found that the Near Detector neutral current selected spectrum is affected by an overestimate of events due to the presence of badly reconstructed events which are characterised by a low energy shower. In most of the cases poorly reconstructed events are activity generated in a charged current interaction which the reconstruction algorithm fails to recognise as connected to the main activity area and reconstructs as a small independent event.…”

Section: Near Detector Preselectionmentioning

confidence: 96%

“…Given the MINOS detector characteristics, there is not much shape information on the hadronic shower development that can be exploited to select neutral current events. Alternative methods to the one presented in this thesis have been studied [142,141,143,144]: the most powerful variables to select neutral current events are the ones which try to identify and reject the muon tracks. The inelasticity y is defined as the fraction of the neutrino energy E ν that is converted into hadronic energy E hadr :…”

Section: Neutrino Eventsmentioning

confidence: 99%

“…In the previous analysis, specific preselection cuts were applied to remove three categories of reconstruction failures [142]: split events, leakage events and incomplete events. Split events occur when a single neutrino interaction results in two reconstructed events.…”

Section: Definition Of Backgroundmentioning

confidence: 99%

“…Cosmic muons that pass the neutral current selection would in general be reconstructed as a very steep shower, with a high density of strips in a few planes crossed [142]. A check on the rate of cosmic muons has been performed by looking at the rate of events collected the left is for all events, the plot on the right is after applying the fiducial volume cuts.…”

Section: Definition Of Backgroundmentioning

confidence: 99%

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Sterile neutrino oscillations in MINOS and hadron production in pC collisions

Tinti

2010

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MINOS is a long baseline neutrino oscillation experiment, starting with a muon-neutrino beam, for the precise measurement of the atmospheric neutrino oscillation parameters |∆m 2 | and θ 23 . The Near Detector measures the neutrino flux and spectra before oscillations. The beam propagates for 735 km to the Far Detector, which measures the depleted spectrum after oscillations. The depletion can be interpreted as ν µ → ν τ oscillations. Subdominant ν µ → ν e oscillations may be allowed if the mixing angle θ 13 = 0.The two detectors are functionally identical in order to cancel systematic errors when using the Near Detector data to constrain the Far Detector prediction. A crucial part of the analysis is the relative calibration between the two detectors, which is known at the 2% level. A calibration procedure to remove the time and temperature dependence of the detector response using through-going cosmic muons is presented here.Although the two-detector approach reduces the systematic uncertainties related to the neutrino flux, a cross check on the neutrino parent meson ratios is performed in this thesis. The cross sections of mesons produced in proton-carbon interactions from the NA49 experiment have been measured and the results have been compared to the MINOS expectations.A neutrino oscillation analysis allowing mixing to a sterile neutrino is performed, under the assumption that the additional mass splitting is O(1 eV 2 ). The analysis uses the energy spectrum of the neutral current interaction products, as neutral current interactions are sensitive to sterile neutrino mixing but not to the active flavour neutrino mixing. The neutrino oscillation parameters have been found to be: To my parents

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Section: Near Detector Preselectionmentioning

confidence: 96%