Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A simplified 2HDM with a scalar dark matter and the galactic center
  gamma-ray excess   Due to the strong constrain from the LUX experiment, the scalar portal dark
matter can not generally explain a gamma-ray excess in the galactic center by
the annihilation of dark matter into $b\bar{b}$. With the motivation of
eliminating the tension, we add a scalar dark matter to the aligned
two-Higgs-doublet model, and focus on a simplified scenario, which has two main
characteristics: (i) The heavy CP-even Higgs is the discovered 125 GeV Higgs
boson, which has the same couplings to the gauge bosons and fermions as the SM
Higgs. (ii) Only the light CP-even Higgs mediates the dark matter interactions
with SM particles, which has no couplings to $WW$ and $ZZ$, but the independent
couplings to the up-type quarks, down-type quarks and charged leptons. We find
that the tension between $<\sigma v>_{SS\to b\bar{b}}$ and the constraint from
LUX induced by the scalar portal dark matter can go away for the
isospin-violating dark matter-nucleon coupling with $-1.0< f^n/f^p<0.7$, and
the constraints from the Higgs search experiments and the relic density of
Planck are also satisfied.

4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys