Uncertainties of Antiproton and Positron Spectra from B/C Data and mSUGRA Contributions for Clumpy Halos

Abstract

We have studied the variation of $e^{+}$ and $\bar{p}$ top of the atmosphere spectra due to the parameters uncertainties of the Milky Way geometry, propagation models and cross sections. We have used the B/C data and Galprop code for propagation analysis. We have also derived the uncertainty bands for subFe/Fe ratio, H and He. Finally we have considered a neutralino induced component in the mSUGRA framework. We conclude that even in the case of diffusion convection model for the standard propagation, where secondary spectra gives a good fit of the data, SUSY contribution can not be excluded up to now due to the overall uncertainties.

8 pages, 11 figures, proceedings for the workshop on ``Science with the New Generation of High Energy Gamma-ray Experiments'', June 2004, Bari (Italy); added references