Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurements of inclusive and differential cross-sections of combined
  $t\bar{t}\gamma$ and $tW\gamma$ production in the $e\mkern-2mu\mu$ channel at
  13 TeV with the ATLAS detector   Inclusive and differential cross-sections for the production of top quarks in
association with a photon are measured with proton$-$proton collision data
corresponding to an integrated luminosity of 139 fb$^{-1}$. The data were
collected by the ATLAS detector at the LHC during Run 2 between 2015 and 2018
at a centre-of-mass energy of 13 TeV. The measurements are performed in a
fiducial volume defined at parton level. Events with exactly one photon, one
electron and one muon of opposite sign, and at least two jets, of which at
least one is $b$-tagged, are selected. The fiducial cross-section is measured
to be $39.6\,^{+2.7}_{-2.3}\,\textrm{fb}$. Differential cross-sections as
functions of several observables are compared with state-of-the-art Monte Carlo
simulations and next-to-leading-order theoretical calculations. These include
cross-sections as functions of photon kinematic variables, angular variables
related to the photon and the leptons, and angular separations between the two
leptons in the event. All measurements are in agreement with the predictions
from the Standard Model.

37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
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The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph