Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The COMPASS sandwich veto detector and a first look at kaonic final
  states from a $\pi^-$ ($190\,\textrm{GeV}) beam on a proton target   We introduce the sandwich veto detector that was built for the 2008 and 2009
hadron runs of the COMPASS experiment at CERN. During these beamtimes it was
serving as a veto detector for neutral and charged particles outside the
spectrometer acceptance, mostly thought to originate from reactions which
excited the target. We also present first mass spectra from $\pi^-(190\,\GeV) p
\to \pi^- \Kshort \Kshort p$ that were measured in the 2008 hadron run.

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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: mtrl-th
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The categories of this paper are: physics
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The categories of this paper are: hep-lat
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The categories of this paper are: atom-ph
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The categories of this paper are: q-bio
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The categories of this paper are: acc-phys
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-th
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The categories of this paper are: comp-gas