Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Matter vs. vacuum oscillations at long baseline accelerator neutrino
  experiments   The neutrino oscillation probabilities at the long-baseline accelerator
neutrino experiments are expected to be modified by matter effects. We search
for evidence of such modification in the data of T2K and NO$\nu$A, by fitting
the data to the hypothesis of (a) matter modified oscillations and (b) vacuum
oscillations. We find that vacuum oscillations provide as good a fit to the
data as matter modified oscillations. Even extended runs of T2K and NO$\nu$A,
with 5 years in neutrino mode $(5 \nu)$ and five years in anti-neutrino mode
$(5 \bar{\nu})$, can {\bf not} make a $3~\sigma$ distinction between vacuum and
matter modified oscillations. The proposed experiment DUNE, with neutrino and
anti-neutrino runs of 5 years each $(5 \nu + 5 \bar{\nu})$, can rule out vacuum
oscillations by itself at $5~\sigma$ if the hierarchy is normal. If the
hierarchy is inverted, a $5~\sigma$ discrimination against vacuum oscillations
requires the combination of $(5 \nu + 5 \bar{\nu})$ runs of T2K, \nova and
DUNE.

13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess