Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Antiproton Flux in Cosmic Ray Propagation Models with Anisotropic
  Diffusion   Recently a cosmic ray propagation model has been introduced, where
anisotropic diffusion is used as a mechanism to allow for $\mathcal{O}(100)$
km/s galactic winds. This model predicts a reduced antiproton background flux,
suggesting an excess is being observed. We implement this model in GALPROP
v50.1 and perform a $\chi^2$ analysis for B/C, $^{10}$Be/$^{9}$Be, and the
recent PAMELA $\bar{p}/p$ datasets. By introducing a power-index parameter
$\alpha$ that dictates the dependence of the diffusion coefficient $D_{xx}$ on
height $|z|$ away from the galactic plane, we confirm that isotropic diffusion
models with $\alpha=0$ cannot accommodate high velocity convective winds
suggested by ROSAT, while models with $\alpha=1$ ($D_{xx}\propto |z|$) can give
a very good fit. A fit to B/C and $^{10}$Be/$^{9}$Be data predicts a lower
$\bar{p}/p$ flux ratio than the PAMELA measurement at energies between
approximately 2 GeV to 20 GeV. A combined fit including in addition the
$\bar{p}/p$ data is marginal, suggesting only a partial contribution to the
measured antiproton flux.

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The categories of this paper are: q-bio
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The categories of this paper are: eess
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The categories of this paper are: patt-sol
22
The categories of this paper are: chao-dyn
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The categories of this paper are: math
28
The categories of this paper are: alg-geom
3
The categories of this paper are: physics
4
The categories of this paper are: cond-mat
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The categories of this paper are: hep-lat
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The categories of this paper are: plasm-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: dg-ga
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The categories of this paper are: cs
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The categories of this paper are: econ
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The categories of this paper are: bayes-an
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The categories of this paper are: quant-ph