Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for $C\!P$ violation and observation of $P$ violation in
  $\Lambda_b^0 \to p \pi^- \pi^+ \pi^-$ decays   A search for $C\!P$ violation in the $\Lambda_b^0 \to p \pi^- \pi^+ \pi^-$
decay is performed using LHCb data corresponding to an integrated luminosity of
6.6$\,fb^{-1}$ collected in $pp$ collisions at centre-of-mass energies of 7, 8
and 13$\,Te\kern -0.1em V$. The analysis uses both triple product asymmetries
and the unbinned energy test method. The highest significances of $C\!P$
asymmetry are 2.9 standard deviations from triple product asymmetries and 3.0
standard deviations for the energy test method. Once the global $p$-value is
considered, all results are consistent with no $C\!P$ violation. Parity
violation is observed at a significance of $5.5$ standard deviations for the
triple product asymmetry method and $5.3$ standard deviations for the energy
test method.

6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
23
The categories of this paper are: solv-int
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
30
The categories of this paper are: q-alg