92 research outputs found
Complementarity Between Hyperkamiokande and DUNE in Determining Neutrino Oscillation Parameters
In this work we investigate the sensitivity to the neutrino mass hierarchy,
the octant of the mixing angle and the CP phase in
the future long-baseline experiments T2HK and DUNE as well as in the
atmospheric neutrino observation at Hyperkamiokande (HK). We show for the first
time that the sensitivity is enhanced greatly if we combine these three
experiments. Our results show that the hierarchy sensitivity of both T2HK and
HK are limited due to the presence of parameter degeneracy. But this degeneracy
is removed when T2HK and HK are added together. With T2HK+HK (DUNE), the
neutrino mass hierarchy can be determined at least at (8 )
C.L. for any value of true . With T2HK+HK+DUNE the significance of
the mass hierarchy increases to almost 15 for the unfavorable value of
. For these combined setup, octant can be resolved except
at C.L for both the hierarchies
irrespective of the value of . The significance of CP violation is
around 10 C.L. for . Apart from that
these combined facility has the capability to discover CP violation for at
least fraction of the true values at for any
value of true . We also find that, with combination of all these
three, the precision of , and
becomes 0.3%, 2% and 20% respectively. We also clarify how the
octant degeneracy occurs in the HK atmospheric neutrino experiment.Comment: 28 pages, 11 figures, 2 tables, Version accepted for publication in
Nucl. Phys.
A hybrid setup for fundamental unknowns in neutrino oscillations using T2HK () and -DAR ()
Neutrino mass hierarchy, CP-violation, and octant of 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
(-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 () and -DAR () in conjunction with full
exposure from T2K and NOA can resolve the issue of mass hierarchy at
greater than 3 C.L. irrespective of the choices of hierarchy,
, and . This hybrid setup can also establish
the CP-violation at 5 C.L. for 55% choices of
, whereas the same for conventional T2HK () setup along with T2K and NOA is around 30%. As far as the octant
of is concerned, this hybrid setup can exclude the wrong octant
at 5 C.L. if is at least away from maximal
mixing for any .Comment: 18 pages, 28 pdf figures, 1 table. Minor changes in the text. A new
footnote added. Accepted in JHE
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