Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Model-Independent $Z'$ Limits from Electron-Electron Collisions   Model independent constraints on the mass of an extra neutral gauge boson and
its couplings to charged leptons are given for the $e^-e^-$ option of a future
linear collider. Analytic exclusion limits are derived in the Born
approximation. The results are compared with those of the $e^+e^-$ mode. The
influence of radiative corrections is discussed.

36
The categories of this paper are: cmp-lg
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The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
21
The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
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The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci