Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sensitivity of discrete symmetry tests in the positronium system with
  the J-PET detector   Study of certain angular correlations in the three-photon annihilations of
the triplet state of positronium, the electron-positron bound state, may be
used as a probe of potential CP and CPT-violating effects in the leptonic
sector. We present the perspectives of CP and CPT tests using this process
recorded with a novel detection system for photons in the positron annihilation
energy range, the Jagiellonian PET (J-PET). We demonstrate the capability of
this system to register three-photon annihilations with an unprecedented range
of kinematical configurations and to measure the CPT-odd correlation between
positronium spin and annihilation plane orientation with a precision improved
by at least an order of magnitude with respect to present results. We also
discuss the the means to control and reduce detector asymmetries in order to
allow J-PET to set the first measurement of the correlation between positronium
spin and momentum of the most energetic annihilation photon which has never
been studied to date.

37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
11
The categories of this paper are: hep-lat
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat