Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Horizontal Position Reconstruction in PandaX-II   Dual-phase noble-gas time projection chambers (TPCs) have improved the
sensitivities for dark matter direct search in past decades. The capability of
TPCs to reconstruct 3-D vertexes of keV scale recoilings is one of the most
advantageous features. In this work, we develop two horizontal position
reconstruction algorithms for the PandaX-II dark matter search experiment using
the dual-phase liquid xenon TPC. Both algorithms are optimized by the
$^{83m}$Kr calibration events and use photon distribution of ionization signals
among photomultiplier tubes to infer the positions. According to the events
coming from the gate electrode, the uncertainties in the horizontal positions
are 3.4 mm (3.9 mm) in the analytical (simulation-based) algorithm for an
ionization signal with several thousand photon electrons in the center of the
TPC

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The categories of this paper are: math
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The categories of this paper are: eess
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The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
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The categories of this paper are: q-bio
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The categories of this paper are: adap-org
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The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
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The categories of this paper are: bayes-an
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg
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The categories of this paper are: econ