Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Degeneracies in long-baseline neutrino experiments from nonstandard
  interactions   We study parameter degeneracies that can occur in long-baseline neutrino
appearance experiments due to nonstandard interactions (NSI) in neutrino
propagation. For a single off-diagonal NSI parameter, and neutrino and
antineutrino measurements at a single L/E, there exists a continuous four-fold
degeneracy (related to the mass hierarchy and $\theta_{23}$ octant) that
renders the mass hierarchy, octant, and CP phase unknowable. Even with a
combination of NO$\nu$A and T2K data, which in principle can resolve the
degeneracy, both NSI and the CP phase remain unconstrained because of
experimental uncertainties. A wide-band beam experiment like DUNE will resolve
this degeneracy if the nonzero off-diagonal NSI parameter is $\epsilon_{e\mu}$.
If $\epsilon_{e\tau}$ is nonzero, or the diagonal NSI parameter $\epsilon_{ee}$
is O(1), a wrong determination of the mass hierarchy and of CP violation can
occur at DUNE. The octant degeneracy can be further complicated by
$\epsilon_{e\tau}$, but is not affected by $\epsilon_{ee}$.

10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex
24
The categories of this paper are: dg-ga
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas