Centrality Dependence of Deuteron Production in PbPb Collisions at 2.76 TeV via Hydrodynamics and Hadronic Afterburner +

The deuteron binding energy is only 2.2 MeV. At the same time, its yield in Pb+Pb collisionsatpsNN = 2.76 TeV corresponds to a thermal yield at the temperature around 155 MeV, which is toohot to keep deuterons bound. This puzzle is not completely resolved yet. In general, the mechanism oflight nuclei production in ultra-high energy heavy ion collisions remains under debate. In a previouswork we suggest a microscopic explanation of the deuteron production in central ultra-relativisticPb+Pb collisions, the main mechanism being ppn $ pd reactions in the hadronic phase of thecollision. We use a state-of-the-art hybrid approach, combining relativistic hydrodynamics for the hotand dense stage and hadronic transport for a later, more dilute stage. Deuteron rescattering in thehadronic stage is implemented explicitly, using its experimentally measured vacuum cross-sections.In these proceedings we extend our previous work to non-central collisions, keeping exactly thesame methodology and parameters. We find that our approach leads to a good description of themeasured deuteron transverse momentum spectra at centralities up to 40%, and underestimatesthe amount of deuterons at low transverse momentum at higher centralities. Nevertheless, thecoalescence parameter B2, measured by ALICE collaboration, is reproduced well in our approacheven for peripheral collisions.