Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Shedding light on CP violation in the charm system via D to V gamma
  decays   Recent evidence for direct CP violation in non-leptonic charm decays cannot
be easily accommodated within the Standard Model (SM). On the other hand, it
fits well in new physics models generating CP violating Delta C=1
chromomagnetic dipole operators. We show that in these frameworks sizable
direct CP asymmetries in radiative D to P+ P- gamma decays (P=pi,K), with M_PP
close to the rho or the phi peak, can be expected. Enhanced matrix elements of
the electromagnetic dipole operators can partly compensate the long distance
dominance in these decays, leading to CP asymmetries of the order of several
percent. If observed at this level, these would provide a clean signal of
physics beyond the SM and of new dynamics associated to dipole operators. We
briefly comment on related CP violating observables accessible via time
dependent D(Dbar) to P+ P- gamma studies and angular decay product
distributions in rare semileptonic D decays.

36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
6
The categories of this paper are: astro-ph