Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bounds on tau neutrino magnetic moment and charge radius from Super-K
  and SNO observations   Neutrinos can scatter electrons in water detectors through their magnetic
moments and charge radii in addition to the charged and neutral currents
channels. The recent solar neutrino charged current event rates announced by
SNO with the earlier solar and atmospheric neutrino observations from
Super-Kamiokande allows us to put upper bounds of $\mu <10^{-9} \mu_B$ on
neutrino magnetic moments and $<r^2> < 10^{-31} cm^2$ on the neutrino charge
radii. For the electron and muon neutrinos these bounds are comparable with
existing bounds but for tau neutrinos these bounds are three orders of
magnitude more stringent than earlier terrestrial bounds. These bounds are
independent of any specific model of neutrino oscillations.

27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys