Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Particle-Antiparticle Metamorphosis of Massive Majorana Neutrinos and
  Gauginos   Recent results on neutrinoless double beta decay, as reported by
Klapdor-Kleingrothaus et al., take us for the first time into the realm of
Majorana spacetime structure. However, this structure has either been treated
as an afterthought to the Dirac construct; or, when it has been attended to in
its own right, its physical and mathematical content was never fully unearthed.
In this Letter,we undertake to remedy the existing situation. We present a
detailed formalism required for the description of the non-trivial spacetime
structure underlying the "nu-nubar" metamorphosis - where "nu" generically
represents a massive Majorana neutrino, or a massive gaugino.

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The categories of this paper are: patt-sol
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The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
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The categories of this paper are: supr-con
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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: mtrl-th
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: chao-dyn