Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurements of charge and CP asymmetries in $b$-hadron decays using
  top-quark events collected by the ATLAS detector in $pp$ collisions at
  $\sqrt{s}=8$ TeV   Same- and opposite-sign charge asymmetries are measured in lepton+jets
$t\bar{t}$ events in which a $b$-hadron decays semileptonically to a soft muon,
using data corresponding to an integrated luminosity of 20.3 fb$^{-1}$ from
proton--proton collisions at a centre-of-mass energy of $\sqrt{s}=8$ TeV
collected with the ATLAS detector at the Large Hadron Collider at CERN. The
charge asymmetries are based on the charge of the lepton from the top-quark
decay and the charge of the soft muon from the semileptonic decay of a
$b$-hadron and are measured in a fiducial region corresponding to the
experimental acceptance. Four CP asymmetries (one mixing and three direct) are
measured and are found to be compatible with zero and consistent with the
Standard Model.

18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
35
The categories of this paper are: mtrl-th
26
The categories of this paper are: bayes-an
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
12
The categories of this paper are: nucl-th
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
3
The categories of this paper are: physics