Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence for two neutrino mass eigenstates from SN 1987A and the
  possibility of superluminal neutrinos   This paper reports a new phenomenological analysis of the neutrino burst
detected from SN 1987 A, and it reveals the presence of two mass eigenstates.
The heavier mass eigenstate has $m_H=21.4 \pm 1.2 eV/c^2$, while the lighter
one has $m_L=4.0 \pm0.5 eV/c^2 $. It is not the first paper to make such a
claim, but it expands on a 1988 conditional analysis by Cowsik, and it attempts
to make the evidence more robust through an improved statistical analysis, and
through providing reasons why alternative explanations are unlikely. It also
shows how the result can be made consistent with existing smaller electron
neutrino mass limits with the existence of a third tachyonic (superluminal)
mass eigenstate.

18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics