Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Latest Results from the K2K experiment   The KEK to Kamioka long-baseline neutrino experiment (K2K) is the first
accelerator-based experiment with hundreds of km neutrino path length. K2K
focuses on the study of the existence of neutrino oscillations in $\nu_{\mu}$
disappearance that is observed in atmospheric neutrinos. With nearly pure muon
neutrino beam produced with $5.6\times 10^{19}$ protons from 12 GeV PS on
target, 56 neutrino events have been observed at Super-Kamiokande, the far
detector at 250 km distance. The expectation is $80.6^{+7.3}_{-8.0}$ derived
from the measurement at the near site. The experiment expects to accumulate
$10^{20}$ protons on target, providing sufficient statistics to study neutrino
oscillations by spectral analysis for $\nu_{\mu}$ disappearance.

14
The categories of this paper are: math-ph
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
37
The categories of this paper are: supr-con
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
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The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs