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arXiv · 2204.10879

Event-by-event anti-deuteron multiplicity fluctuation in Pb+Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV

Kai-Jia Sun·Che Ming Ko
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Abstract

Using the nucleon coalescence model based on kinetic freeze-out nucleons from the hybrid model of MUSIC hydrodynamics and UrQMD hadronic transport, we study the production of anti-deuteron and its event-by-event fluctuation in Pb+Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV. We find a clear suppression of the anti-deuteron to antiproton yield ratio in peripheral collisions, which is in accordance with the measurements from the ALICE Collaboration. Also found is a Poissonian event-by-event fluctuation of the anti-deuteron multiplicity distribution in all collision centralities, which is different from the prediction of a simple coalescence model calculation that assumes all antiproton and antineutron pairs to have the same probability to form anti-deuterons. We further find a small negative correlation between the anti-deuteron and antiproton multiplicity distributions as a result of the baryon conservation.

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Kai-Jia Sun, Che Ming Ko. 2022-06-11. Event-by-event anti-deuteron multiplicity fluctuation in Pb+Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV. https://doi.org/10.1016/j.physletb.2023.137864

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