Galactic cosmic ray antiproton flux is used to study possible traces of dark matter annihilation. In this work, the background of antiprotons produced by galactic cosmic rays interacting with the interstellar medium has been re-evaluated on the basis of an improved model of antiproton production cross-section and using state-of-art galactic and heliospheric cosmic ray transport codes. We found that the antiproton flux measured by AMS-02 is underestimated by the model of about 3% in the range between 4 and 40 GeV with a significance higher than 6σ, considering only the cross-section uncertainties. However, the full evaluation of the significance of the observed discrepancy depends on other modelization uncertainties, to be estimated in further work.
D’Angelo et al. (Mon,) studied this question.