Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Status and prospects of searches for neutrinoless double beta decay   The simultaneous beta decay of two neutrons in a nucleus without the emission
of neutrinos (called neutrinoless double beta decay) is a lepton number
violating process which is not allowed in the Standard Model of particle
physics. More than a dozen experiments using different candidate isotopes and a
variety of detection techniques are searching for this decay. Some (EXO-200,
Kamland-Zen, GERDA) started to take data recently. EXO and Kamland-Zen have
reported first limits of the half life $T_{1/2}^{0\nu}$ for $^{136}$Xe. After a
decade of little progress in this field, many new results will soon scrutinize
the claim from part of the Heidelberg-Moscow collaboration to have observed
this decay. The sensitivities of the different proposals are reviewed.

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The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
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The categories of this paper are: eess
21
The categories of this paper are: adap-org
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The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
1
The categories of this paper are: cs