Abstract
According to the recent results of the neutrino oscillation experiment MINOS, the neutrino mixing angle $\theta_{23}$ may not be maximal ($45^{\circ}$). Two nearly degenerate solutions are possible, one in the lower octant (LO) where $\theta_{23}<45^{\circ}$, and one in the higher octant (HO) where $\theta_{23}>45^{\circ}$. Long baseline experiments measuring the $\nu_{\mu}\rightarrow\nu_{e}$ are capable of resolving this degeneracy. In this work we study the potential of the planned European LBNO experiment to distinguish between the LO and HO solutions.
Highlights
In this paper, we analyze the potential of the planned long baseline neutrino oscillation experiment LBNO [12] for resolving the θ23 octant degeneracy
The muon neutrino beam is assumed to be produced in the CERN SPS accelerator with a power of 750 kW, shared between neutrino and antineutrino modes at a 50%/50% ratio. (This is the same set-up proposed in [19] for the determination of the mass hierarchy.) This corresponds to 1.125 × 1020 POT per year for each beam, and it builds up a total yield of 1.125 × 1021 over the course of the 5+5 -year running time
The observed events is the category of events that would result from oscillation parameter values that one considers to be closest to the truth
Summary
We analyze the potential of the planned long baseline neutrino oscillation experiment LBNO [12] for resolving the θ23 octant degeneracy. The software evaluates the effect of matter potentials induced by the traversed medium and calculates the resulting event rates that follow from the detection and reconstruction of neutrino events that take place in the detector. The estimated event rates are used to evaluate the likelihood of different oscillation parameter values with χ2-distributions.
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