Köln 2025 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 57: Heavy-Ion Collisions and QCD Phases IX

HK 57.5: Vortrag

Donnerstag, 13. März 2025, 18:45–19:00, HS 3 Chemie

Angular Correlations in Jets — •Lars Jörgensen for the ALICE Germany collaboration — Technische Universität München

Antinuclei in cosmic rays could be an indicator for dark matter decay. In order to correctly interpret any future measurement of the flux of antinuclei in our galaxy, the formation mechanism of antinuclei must be understood. The coalescence model aims to describe the formation process on a microscopic level by assuming that nucleons close in phase space are likely to form a bound state. A powerful tool to test coalescence is the study of nuclear production in jets since their emission is highly collimated, and therefore the coalescence condition is likely to be fulfilled. In this contribution, a first measurement of angular correlations between (anti)nucleons inside jets will be presented. Further, the yields of (anti)nucleons and (anti)nuclei in jets will be shown. With these ingredients it is possible to make a prediction on (anti)nuclei production in jets using a coalescence model such as ToMCCA. This model shows the expected enhancement of the coalescence parameter B₂ in jets previously observed in other analyses. With this extension to the ToMCCA model it is possible to study nuclei production in point-like systems similar to e⁺−e⁻, which is expected to closely resemble dark matter annihilation. This work was funded by the BMBF 05P24W04 ALICE.

Keywords: nuclei; coalescence; jets; dark matter