Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraints on a sub-eV scale sterile neutrino from non-oscillation
  measurements   Anomalies in several short-baseline neutrino oscillation experiments suggest
the possible existence of sterile neutrinos at about eV scale having
appreciable mixing with the already known three neutrinos. We find that if such
a light sterile neutrino exists, through a combined study of the leptonic
decays of $\mu^-$, $\tau^-$, $\pi^-$ and $K^-$, some semi-leptonic decays of
$\tau^-$ and the invisible decay width of the $Z$ boson, it is possible to
constrain the relevant mixing matrix elements. Furthermore, we compare the
constraints, derived by using the method presented here, with the experimental
results obtained from short-baseline neutrino oscillation experiments. We find
that a single light sterile neutrino cannot satisfy the existing short-baseline
neutrino oscillation constraints and explain the anomalies mentioned above.
Along the way we provide a number of experimentally clean observables which can
be used to directly study the light sterile neutrino independently of the
neutrino oscillation experiments.

21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph