Speaker
Description
Leptonic CP violation phase $\delta_{CP}$ is one of the current unknowns in neutrino oscillation physics. Not knowing the hierarchy of neutrino masses can bring an ambiguity in the measurement of $\delta_{CP}$. While accelerator based long baseline experiments like the proposed DUNE experiment can determine $\delta_{CP}$ without hierarchy ambiguity, it is interesting to study low energy atmospheric neutrinos also for this purpose. Atmospheric neutrinos whose flux peaks at low (sub-GeV) energies will give a significant amount of events in addition to the event spectra being hierarchy independent at these energies. The effect of detector resolutions and systematic uncertainties on the sensitivity to $\delta_{CP}$ are studied.
It is also found that a detector which can separate neutrinos ($\nu$) from anti-neutrinos ($\overline{\nu}$) will give a better sensitivity to $\delta_{CP}$. In view of the large future neutrino detectors, low energy atmospheric neutrinos are interesting since a wide variety of physics other than $\delta_{CP}$ can be probed. We also study the sensitivity to $\theta_{12}$ using low energy atmospheric neutrinos.
Reference:
D. Indumathi, S. M. Lakshmi, and M. V. N. Murthy,``Hierarchy independent sensitivity to leptonic $\delta_{CP}$ with atmospheric neutrinos", Phys.Rev. D 100, 115027, 2019.
