Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-07-23
Phys. Rev. D 80, 073008 (2009)
Physics
High Energy Physics
High Energy Physics - Phenomenology
9 pages, 7 figures, clarifying discussions on results added; accepted in Phys. Rev. D
Scientific paper
10.1103/PhysRevD.80.073008
We have studied the prospects of measuring the CP violating phase with atmospheric neutrinos at a large magnetized iron calorimeter detector considering the muons (directly measurable) of the neutrino events generated by a MonteCarlo event generator Nuance. The effect of $\theta_{13}$ and $\delta_{CP}$ appears dominantly neither in atmospheric neutrino oscillation nor in solar neutrino oscillation, but appears as subleading in both cases. These are observable in range of $E \sim 1$ GeV for atmospheric neutrino, where solar and atmospheric oscillation couple. In this regime, the quasi-elastic events dominate and the energy resolution is very good, but the angular resolution is very poor. Unlike beam experiments this poor angular resolution acts against its measurements. However, we find that one can be able to distinguish $\delta_{CP}\approx 0^\circ$ and $180^\circ$ at 90% confidence level. We find no significant sensitivity for $\delta_{CP}\approx 90^\circ$ or $270^\circ$.
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