Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of gamma gamma Background in e+e- -> W+W- nu nu -> H nu nu Events
  at the Tesla e+e- Linear Collider   The effect of the overlap of gamma gamma -> hadrons to H nu nu events has
been studied for the case of the Tesla e+e- linear collider at 350 GeV. It was
found that, due to the significant bunch length and the track extrapolation
accuracy provided by the Vertex Tracker, the gamma gamma background to physics
events can be substantially reduced, with moderate loss in reconstruction
efficiency, by a combination of kinematical and vertex topology observables.
The remaining background, being confined to very forward hadron production,
does not significantly interfere with the event reconstruction.

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The categories of this paper are: plasm-ph
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The categories of this paper are: eess
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The categories of this paper are: chao-dyn
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The categories of this paper are: econ
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The categories of this paper are: q-fin
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The categories of this paper are: comp-gas
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The categories of this paper are: nlin
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
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The categories of this paper are: atom-ph
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
3
The categories of this paper are: physics
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The categories of this paper are: alg-geom