AMS-02 antiprotons' consistency with a secondary astrophysical origin

Abstract

The AMS-02 experiment has ushered cosmic-ray physics into precision era. In a companion paper, we designed an improved method to calibrate propagation models on B/C data. Here we provide a robust prediction of thep flux, accounting for several sources of uncertainties and their correlations. Combined with a correlation matrix for thep data, we show that the latter are consistent with a secondary origin. This Letter presents key elements relevant to dark matter search in this channel, notably by pointing out the inherent difficulties in achieving predictions at the percent-level precision. arXiv:1906.07119v1 [astro-ph.HE]

usine: Semi-analytical models for Galactic cosmic-ray propagation

“…), and CR data (or correlation matrix) are enabled. These specificities were developed and taken advantage of to provide sound statistical analyses of recent high-precision AMS-02 data in [7,15,29].…”

“…My wish list would be the inclusion of electrons and positrons in 1D and 2D models following [6], the inclusion of dark matter contributions in 2D models (as was present in the second unreleased version of the code), the interface with MCMC engines, add splines as alternative to formulae in calculations, the proper inclusion of EC-decay CRs in propagation, 1D spheri-cally symmetric Solar modulation model, and the extension of CR list and cross-section files for very heavy CRs (Z > 30). usine v3.5 was developed for the AMS-02 B/C and p analyses carried out in [7,15,29]. With respect to v3.4, it has more flexibility in the fit parameters and more plots for minimisation analyses.…”

“…• New ./bin/usine pbar executable to propagate transport, source, and cross-section uncertainties to antiprotons. This was developed and used for the analysis in [7]. [29], here for 10000 drawn values (option -u1).…”

“…Some of the production cross sections were for instance obtained running WNEW [e.g., 64] and YIELDX [e.g., 62] codes with the usine 20 or GALPROP [28] list of ghosts. For more details and references on the various models behind these cross sections, we refer the reader to [28] and [7,8,16,18,20,37,66] for nuclei and anti-nuclei respectively.…”

“…7. This article describes usine v3.4, used in [1], but it also highlights in Appendix A the improved v3.5, used for AMS-02 data analyses in [7,15,29].…”