Observation of Disappearance of Muon Neutrinos in the NuMI Beam

Measurement of the Muon Neutrino Inclusive Charged Current Cross Section on Iron using the MINOS Detector

“…Its purpose is to remove hadrons remaining in the beam at the end of the decay volume in a controlled manner. A breakaway view of the hadron absorber produced from the GEANT4 [22,26,27] beam Monte Carlo is shown in Figure 2.7. It has an innermost core composed of aluminum and steel surrounded by steel shielding blocks.…”

“…As a result, many neutrino flux uncertainties are directly constrained by data to be quite small [22]. Thus, attention may be paid to the measurement Deviations in the direction of the muon beam are less than ∼10 µrad.…”

“…The subsequent tracking through the beamline into the decay volume is done with a Geant3 Carlo, the current in the horns is fixed while in reality the measured current sent through the horns has a 1% uncertainty [22] and also undergoes temporal variations as described in Section 3.3. Another focusing uncertainty is that the distribution of current within the horn conductors is not precisely known since it is expected that the skin depth of current penetration into the conductors is on the same order as the thickness of the conductors [22].…”

“…The uncertainty on the flux resulting from these effects has been systematically studied by varying each of beamline properties in Monte Carlo [22]. Furthermore, none of these experiments were performed at p beam = 120 GeV/c on a graphite targe, requiring scaling in beam energy and target nucleus.…”

“…Furthermore, none of these experiments were performed at p beam = 120 GeV/c on a graphite targe, requiring scaling in beam energy and target nucleus. Further discussion of these effects can be found in Ref [22]. Significantly, the experiments also used thin targets which were less than 1/5th…”