Speaker
Description
This work presents the first comprehensive study of inclusive Σ(1385)± hyperon production in proton–proton collisions at a kinetic beam energy of 4.5 GeV, performed with the High-Acceptance Di-Electron Spectrometer (HADES) at GSI. The Σ(1385)± resonances were reconstructed via their dominant hadronic decay channels Σ(1385)± → Λπ±, with subsequent Λ → pπ- decay. Extraction of a clean signal was achieved using advanced background suppression techniques, including machine-learning-based event selection.
Efficiency and acceptance corrections were obtained from detailed simulations of various exclusive production channels using the PLUTO event generator, constrained by known cross-section and model calculations. Differential distributions in transverse momentum and rapidity were extracted over a broad kinematic range, benefiting from the extended HADES acceptance provided by a new Forward Detector. The Σ(1385)+ rapidity distribution exhibits forward–backward peaking, consistent with a t-channel production mechanism dominated by pion exchange, in agreement with previous exclusive measurements. In contrast, Σ(1385)− production is more centered around mid-rapidity. The results will be presented and compared to the available model calculations.
| Collaboration | HADES |
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