Short Description
These plots show the reconstructed energy distributions of identified neutral current events in MINOS for four oscillation hypotheses. These are:
- No oscillations
- Maximal νμ → ντ oscillations with sin22θ=1
- Maximal νμ → νsterile oscillations with sin22θ=1
- Mixed νμ → ντ, νμ → νsterile oscillations with equal amplitudes (sin22θ=0.5)
The event classification algorithm used to produce these figures is described in NuMI-L-691. Pattern recognition techniques (Hough Transform) are used for the NuMI low energy and medium enegy beam spectra, and a simple event length cut is used for the NuMI high energy beam spectrum.
The first group of 3 plots show the visible energy distributions (broken down into NC, νμ CC and ντ CC components) for the 4 oscillation hypotheses listed above and Δm2=0.0035 eV2.
The second group of three plots shows the total visible energy distributions for each of the three beam spectra and Δm2=0.002, 0.0035 and 0.005 eV2. The top plots show the energy distributions for each of the four mixing hypotheses. The bottom plots show the ratios of oscillated to unoscillated energy distributions. The error bars are representative of a 10 kiloton year exposure of MINOS.
Plots
NC distributions (Δm2=0.0035 eV2, individual components)
- Using the NuMI low energy neutrino beam spectrum: in EPS or GIF
- Using the NuMI medium energy neutrino beam spectrum: in EPS or GIF
- Using the NuMI high energy neutrino beam spectrum: in EPS
Energy distributions and ratios for various Δm2
Plot Conditions
For all three beam spectra, a 10 kiloton year exposure (statistical fluctuations are suppressed). All mixing hypotheses assume maximal neutrino mixing (the sum of active and sterile neutrino oscillation amplitudes is one).
Matter effects are not included in these plots.
Generator Info
David Petyt , 15th December 2000
References
NuMI-L-691 - details of the analysis and further plots
