Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Have Superkamiokande Really Measured the Direction of the Atmospheric
  Neutrinos which Produce Fully Contained Events and Partially Contained Events
  ?   Quasi Elastic Scattering (QEL) is the dominant source for producing both
Fully Contained Events and Partially Contained Events in the
Superkamiokande(SK) detector for the atmospheric neutrinos, in the range 0.1
GeV to 10 GeV. In the analysis of SK events, it is assumed that the direction
of the incident neutrino is the same as that of the detected charged lepton. In
the present letter, we derive the distribution function for the scattering
angle of the charged leptons, their averaged scattering angle and their
standard deviation due to QEL. Then, it is shown that the SK assumption for the
scattering angle of the charged leptons in the QEL is not valid. Further, we
examine the influence of the azimuthal angle of the charged leptons over their
zenith angle. As the result, we conclude that the zenith angle distribution of
the neutrino under the SK assumption does not reflect the real zenith angle
distribution of the atmospheric neutrino which produces Fully Contained Events
and Partially Contained Events. This result has clear implication for attempts
to detect neutrino oscillations from the analyses of Fully Contained Events and
Partially Contained Events in Superkamiokande.

21
The categories of this paper are: adap-org
19
The categories of this paper are: eess
2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin