Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: L_e + L_\mu - L_\tau - L_s Symmetry and a Mixed 2+2 Scenario for
  Neutrino Oscillations   Recent results from SuperKamiokande and SNO experiments have set severe
constraints on possible mixings of a light sterile neutrino, \nu_s, with the
three active species required for a simultaneous explanation of the solar,
atmospheric and LSND neutrino oscillation data. A consistent scheme has emerged
from a global analysis of the data wherein two of the neutrinos are nearly
degenerate with a mass of order 1 eV, that mix significantly with the two
lighter states. We present realizations of such a mixed 2+2 oscillation
scenario based on L_e + L_\mu - L_\tau - L_s symmetry (L_i stands for the ith
lepton number). Breaking of of this lepton number symmetry by a small mass term
for \nu_s leads to the required large mixings for both the atmospheric and the
solar neutrino oscillations. Sum rules for the neutrino oscillation parameters
are derived within this scheme, and are shown to be consistent with present
data. These models predict U_{e3} = 0.02-0.03, which can serve as a test of
this idea. We also present gauge models based on mirror extensions of the
Standard Model that naturally lead to a light sterile neutrino with the
required mixing pattern.

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The categories of this paper are: math-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol
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The categories of this paper are: q-fin
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
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The categories of this paper are: cs
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The categories of this paper are: acc-phys
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The categories of this paper are: math
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The categories of this paper are: alg-geom
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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-th
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The categories of this paper are: atom-ph
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The categories of this paper are: physics