Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Direct CP violation in beauty and charm hadron decays   Since the discovery of CP violation more than 5 decades ago, this phenomenon
is still attracting a lot of interest. Among the many fascinating aspects of
this subject, this review is dedicated to direct CP violation in non-leptonic
decays. The advances within the last decade have been enormous, driven by the
increasingly large samples of b- and c-hadron decays, and have led to very
interesting results such as large CP asymmetries in charmless B decays and the
observation of direct CP violation in the charm sector. We address the quest
for understanding the origin of strong phases, the importance of final state
interactions and the relation with CPT symmetry, and different approaches to
measure direct CP violation in these decays. The main experimental results and
their implications are then discussed.

5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
1
The categories of this paper are: cs
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin