Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The $\bm{e^- e^-}$ mode of LC: opportunities to discover loop-level
  lepton flavor (number) violation   The $e^- e^-$ mode with lepton number $L=+2$ of the initial state is
particularly suitable for studying lepton and flavor number violating reactions
(LFV). In this brief report we give a summary of the study of two loop-level
reactions which violate lepton and flavor numbers: we first consider seesaw
type models with heavy Majorana neutrinos at the TeV scale and study the
reactions $e^{-}e^{-} \to \ell^{-}\ell^{-}$, and then similar reactions
$e^{-}e^{-} \to \ell^{-}e^{-}$ ($\ell=\mu,\tau$) in supersymmetric models where
LFV is due to slepton mixing.

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The categories of this paper are: hep-th
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The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
2
The categories of this paper are: math
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
25
The categories of this paper are: patt-sol
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg