Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: D meson mass increase by restoration of chiral symmetry in nuclear
  matter   Spectral functions of the pseudoscalar $D$ meson in the nuclear medium are
analyzed using QCD sum rules and the maximum entropy method. This approach
enables us to extract the spectral functions without any phenomenological
assumption, and thus to visualize in-medium modification of the spectral
functions directly. It is found that the reduction of the chiral condensates of
dimension 3 and 5 causes the masses of both $D^+$ and $D^-$ mesons to grow
gradually at finite density. Additionally, we construct
charge-conjugate-projected sum rules and find a $D^+$-$D^-$ mass splitting of
about -15 MeV at nuclear saturation density.

30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
16
The categories of this paper are: stat
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ