Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pulse shape analysis in GERDA Phase II   The GERmanium Detector Array (GERDA) collaboration searched for neutrinoless
double-$\beta$ decay in $^{76}$Ge using isotopically enriched high purity
germanium detectors at the Laboratori Nazionali del Gran Sasso of INFN. After
Phase I (2011-2013), the experiment benefited from several upgrades, including
an additional active veto based on LAr instrumentation and a significant
increase of mass by point-contact germanium detectors that improved the
half-life sensitivity of Phase II (2015-2019) by an order of magnitude. At the
core of the background mitigation strategy, the analysis of the time profile of
individual pulses provides a powerful topological discrimination of signal-like
and background-like events. Data from regular $^{228}$Th calibrations and
physics data were both considered in the evaluation of the pulse shape
discrimination performance. In this work, we describe the various methods
applied to the data collected in GERDA Phase II corresponding to an exposure of
103.7 kg$\cdot$yr. These methods suppress the background by a factor of about 5
in the region of interest around Q$_{\beta\beta}$ = 2039 keV, while preserving
(81$\pm$3)% of the signal. In addition, an exhaustive list of parameters is
provided which were used in the final data analysis.

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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: solv-int
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The categories of this paper are: plasm-ph
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The categories of this paper are: stat
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: nlin
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: econ
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-ex
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The categories of this paper are: funct-an
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The categories of this paper are: math