Erlangen 2026 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 24: Heavy-Ion Collisions and QCD Phases IV

HK 24.7: Vortrag

Mittwoch, 18. März 2026, 15:30–15:45, PHIL A 401

Lambda reconstruction at SIS18: a mCBM campaign — •Abhishek Anil Deshmukh for the CBM collaboration — Bergische Universität Wuppertal, Wuppertal, Deutschland

The production of strange hadrons, such as the Λ particle, serves as a standard candle for probing the properties of dense nuclear matter created in heavy-ion collisions at SIS18 energies at GSI, Darmstadt. The mini-CBM (mCBM) experiment, a prototype for the upcoming CBM experiment, allows for these measurements. Its narrow acceptance, combined with the lack of magnetic field present a unique challenge, rendering the reconstruction of multi-particle decay topologies particularly difficult.

This contribution presents the reconstruction of Λ particles via their dominant charged hadronic decay channel Λ → p + π⁻ (63.9%). The method has been successfully developed, tested, and optimized on Monte Carlo simulations, where its performance and selection criteria have been thoroughly characterized.

The mCBM collaboration conducted beamtime campaigns in 2024 and 2025, collecting a total of six datasets with various beam and energy combinations. This contribution will present the status of applying the validated analysis technique to experimental data from the Ni+Ni collisions at 1.93A GeV. A first look at the Λ signal will be provided, and the preliminary performance of the reconstruction algorithm on real data will be discussed in comparison to the simulation. ^*Work supported by BMBF (05P24PX1)

Keywords: heavy-ion collisions; QCD phase diagram; CBM; mCBM; Lambda