Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First Search for Lorentz and CPT Violation in Double Beta Decay with
  EXO-200   A search for Lorentz- and CPT-violating signals in the double beta decay
spectrum of $^{136}$Xe has been performed using an exposure of 100 kg$\cdot$yr
with the EXO-200 detector. No significant evidence of the spectral modification
due to isotropic Lorentz-violation was found, and a two-sided limit of $-2.65
\times 10^{-5 } \; \textrm{GeV} < \mathring{a}^{(3)}_{\text{of}} < 7.60 \times
10^{-6} \; \textrm{GeV}$ (90% C.L.) is placed on the relevant coefficient
within the Standard-Model Extension (SME). This is the first experimental study
of the effect of the SME-defined oscillation-free and momentum-independent
neutrino coupling operator on the double beta decay process.

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The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-ex
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The categories of this paper are: econ
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The categories of this paper are: comp-gas
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The categories of this paper are: math
31
The categories of this paper are: ao-sci
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The categories of this paper are: nlin
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: stat