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arXiv · 2206.00410

Kinetic mass shifts of $ρ$(770) and $K^*$(892) in Au+Au reaction at $E_\mathrm{beam}=1.23~A$GeV

Tom Reichert·Marcus Bleicher
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Abstract

We explore the properties of the last generation of $ρ$(770) and $K^*$(892) resonances created in Au+Au reactions at E$_\mathrm{lab}=1.23$~AGeV via the reconstruction in the hadronic channel using the UrQMD model. Such resonance studies allow to obtain detailed information on the emission source in such reactions in a complementary way to di-lepton or HBT studies. We observe a freeze-out hierarchy and predict mass shifts for the $ρ$(770) resonance ($Δm_ρ\approx -330$ MeV) and the $K^*$(892) resonance ($Δm_{K^*} \approx -30$ MeV). These mass shifts are related to the regeneration cycles of each resonance species and are of purely kinetic origin. Experimentally our predictions can be tested using the GSI-HADES experiment or the lowest RHIC-BES energy.

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Tom Reichert, Marcus Bleicher. 2023-02-27. Kinetic mass shifts of $ρ$(770) and $K^*$(892) in Au+Au reaction at $E_\mathrm{beam}=1.23~A$GeV. https://doi.org/10.1016/j.nuclphysa.2022.122544

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