Speaker
Description
Motivated by various excesses observed by Fermi-LAT and AMS, we perform a detailed analysis of QCD uncertainties on particle spectra from dark-matter annihilation (or decay) into jets. When annihilated to SM particles, the final-state products undergo various complicated processes such as QED and QCD bremsstrahlung, hadronization, and hadron decays. These processes contain some intrinsic uncertainties which are usually difficult to model and which are neglected in physical analyses. First, we perform several re-tunings of the fragmentation function parameters. Then, we estimate two kinds of uncertainties: (i) perturbative from QCD showers and (ii) non-perturbative from hadronization function. The results are tabulated for a wide range of dark matter masses and annihilation channels. They can be found on Zenodo; https://doi.org/10.5281/zenodo.3764809
| Reference to paper (DOI or arXiv) | https://arxiv.org/abs/1812.07424 |
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