Supplemental Material
The microscopic production mechanism of light (anti)nuclei in high-energy hadronic collisions is still puzzling and under intense debate in the scientific community. This paper presents the results of a novel research line that consists in measuring the (anti)nuclei production in and out of jets in small collision systems. For the first time, a largely enhanced (anti)deuteron production probability is measured in jets with respect to that in the underlying event. This striking effect is consistent with predictions from the baryon coalescence model. These important results pave the way for further investigations with heavier (anti)nuclei in the LHC Run 3.
