Speaker
Sushant Raut
Description
Recent measurements have shown that the value of $\theta_{13}$ in nature is moderately large. This allows the possibility of measuring the neutrino mass hierarchy, octant of $\theta_{23}$ and CP-violating phase $\delta_{CP}$ at the next generation of neutrino oscillation experiments. Long-baseline experiments have very good energy resolution, and hence are well suited to measure the mass-square differences, mixing angles and CP phase to a high degree of precision. Atmospheric neutrino experiments can access neutrinos over a wide range of baselines and energies and can resolve the problems of determining the mass hierarchy and octant of $\theta_{23}$, due to resonant matter effects.
The sensitivity of long-baseline experiments to the unknown neutrino
oscillation parameters depends on the value of $\delta_{CP}$ in nature. In fact, for unfavourable combinations of these parameters, the capabilities of long-baseline experiments are severely limited. On the other hand, the capabilities of atmospheric neutrino experiments have been shown to be independent of $\delta_{CP}$. We explore the reasons for the $\delta_{CP}$-independence of atmospheric neutrino results. We then study the synergy between atmospheric and long-baseline experiments. We find that there is a marked improvement in the sensitivity of long-baseline experiments for unfavourable values of parameters, when data from atmospheric experiments are also taken into account. We present our results in the context of planned upcoming oscillation experiments.
Primary author
Co-authors
Pomita Ghoshal
(Physical Research Laboratory, Ahmedabad, India)
Srubabati Goswami
(Physical Research Laboratory)
