Speaker
Description
In this talk, we present a tuning of PYTHIA and a coalescence model that leads to realistic predictions of antinuclei production. This tuning is validated against LEP data including the fragmentation function of $b$-quarks into into $b$-hadrons, which is crucial for determining the $\bar{\Lambda}_b^0$ multiplicity. The coalescence model is tuned to ALICE data for the $\overline{\text{D}}$ and ${}^3\overline{\text{He}}$ spectra. We obtain a branching ratio for the production of ${}^3\overline{\text{He}}$ from $\bar{\Lambda}_b^0$ decays that is consistent with the recent upper limit measured by LHCb. In the end, we find that the contributions of $\overline{\text{D}}$ and ${}^3\overline{\text{He}}$ from dark matter via $\bar{\Lambda}_b^0$ decays are negligible compared to prompt production, challenging previous claims in the literarure.
