Köln 2025 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 35: Heavy-Ion Collisions and QCD Phases VI

HK 35.3: Vortrag

Mittwoch, 12. März 2025, 18:00–18:15, HS 3 Chemie

A Realistic Coalescence Model for Nuclei Production — •Maximilian Mahlein — Technische Universität München

Understanding the formation of (anti)nuclei in high-energy collisions has attracted large interest over the last few years. According to the coalescence model, nucleons form independently and then bind together after freeze-out if they are close in phase-space. A recent advancement of the model is the Wigner function formalism, which allows the calculation of the coalescence probability based on the distance and relative momentum of the constituent nucleons. The interest in explaining nuclear formation processes extends beyond standard model physics, with implications for indirect Dark Matter searches. Understanding the production mechanism of antinuclei is crucial for correctly interpreting any future measurement of antinuclear flux in space, as it would allow for the differentiation of the background originating from collisions between high-energy Cosmic Rays and the stationary Interstellar Medium. In this presentation, we provide a comprehensive overview of the state-of-the-art coalescence formalism, not only for deuterons but also for the more intricate case of A=3 nuclei. This represents a significant advancement, as previous efforts primarily focused on modeling the formation of deuterons. The model is tested for pp collision data measured by ALICE. Our approach introduces a novel aspect by implementing this model into a purpose-built Monte Carlo generator called ToMCCA offering exceptional adaptability while maintaining superior performance compared to general-purpose event generators. This work was funded by the BMBF 05P24W04 ALICE.

Keywords: nuclei; Coalescence; Femtoscopy; Cosmic Rays; Monte Carlo