A hybrid setup for fundamental unknowns in neutrino oscillations using T2HK (nu) and mu-DAR (%26lt;(nu)over bar %26gt;)

作者：Agarwalla Sanjib Kumar; Ghosh Monojit; Raut Sushant K

来源：The Journal of High Energy Physics, 2017, 2017(5): 115.

DOI：10.1007/JHEP05(2017)115

• Neutrino Physics
• CP violation

Neutrino mass hierarchy, CP-violation, and octant of theta(23) are the fundamental unknowns in neutrino oscillations. In order to address all these three unknowns, we study the physics reach of a setup, where we replace the antineutrino run of T2HK with antineutrinos from muon decay at rest (mu-DAR). This approach has the advantages of having higher statistics in both neutrino and antineutrino modes, and lower beam-on backgrounds for antineutrino run with reduced systematics. We find that a hybrid setup consisting of T2HK (nu) and mu-DAR ((nu) over bar) in conjunction with full exposure from T2K and NO nu A can resolve the issue of mass hierarchy at greater than 3 sigma C.L. irrespective of the choices of hierarchy, delta(CP), and theta(23). This hybrid setup can also establish the CP-violation at 5 sigma C.L. for similar to 55% choices of delta(CP), whereas the same for conventional T2HK (nu vertical bar (nu) over bar) setup along with T2K and NO nu A is around 30%. As far as the octant of theta(23) is concerned, this hybrid setup can exclude the wrong octant at 5 sigma C.L. if theta(23) is at least 3 degrees away from maximal mixing for any delta(CP).

• 出版日期2017-5-22