Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $CP$ Properties of Higgs Boson Interactions with Top Quarks in the
  $t\bar{t}H$ and $tH$ Processes Using $H \rightarrow \gamma\gamma$ with the
  ATLAS Detector   A study of the $CP$ properties of the interaction between the Higgs boson and
top quarks is presented. Higgs bosons are identified via the diphoton decay
channel ($H \rightarrow \gamma\gamma$) and their production in association with
a top quark pair ($t\bar{t}H$) or single top quark ($tH$) is studied. The
analysis uses 139 fb$^{-1}$ of proton-proton collision data recorded at a
center-of-mass energy of $\sqrt{s}$ = 13 TeV with the ATLAS detector at the
Large Hadron Collider. Assuming a $CP$-even coupling, the $t\bar{t}H$ process
is observed with a significance of 5.2 standard deviations. The measured cross
section times $H \to \gamma \gamma$ branching ratio is
$1.64\;^{+0.38}_{-0.36}\;\text{(stat.)}\;^{+0.17}_{-0.14}\;(\text{sys.})$ fb,
and the measured rate for $t\bar{t}H$ is
$1.43\;^{+0.33}_{-0.31}\;\text{(stat.)}\;^{+0.21}_{-0.15}\;(\text{sys.})$ times
the Standard Model expectation. The $tH$ production process is not observed and
an upper limit on its rate of 12 times the Standard Model expectation is set. A
$CP$-mixing angle greater (less) than 43 (-43)$^\circ$ is excluded at 95%
confidence level.

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The categories of this paper are: alg-geom
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The categories of this paper are: patt-sol
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The categories of this paper are: adap-org
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-th
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
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The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph