National Undergraduate Physics Conference (NUPC) 2026

Generator-level comparison of UrQMD and SMASH for CBM-MUCH Dimuon studies

Not scheduled

20m

Indian Institute of Science Education and Research (IISER), Tirupati

Poster Presentation High-energy physics

Speaker

Neeva Patel (Sardar Vallabhbhai National Institute of Technology)

Description

The fixed-target heavy-ion experiments, such as the Compressed Baryonic Matter (CBM) experiment at the Facility for Antiproton and Ion Research (FAIR), will explore the QCD phase diagram at high net-baryon density. CBM uses Ultra-Relativistic Quantum Molecular Dynamics (UrQMD), which has low dilepton yields from low-mass vector meson (LMVM) decays, making large event samples computationally challenging. Simulating Many Accelerated Strongly-interacting Hadrons (SMASH) uses a weighted-multiplicity approach to enhance dilepton production.
We present a generator-level comparison between UrQMD and SMASH for central Au+Au collisions at 10A GeV. Pseudorapidity distributions of all particles are compared. The mean pseudorapidity values (η ≈ 2.0) are very similar, differing by less than 1%, while the total particle yield per event differs by about 5%. In the forward region (η > 3), SMASH yields slightly more particles than UrQMD. The effect of these generator-level differences will be investigated in the next stage using the CBMROOT GEANT4 simulation.