Benchmark Optical Physics for lhcb

[Rashika-Gupta]

Benchmark and compare Geant4 and Celeritas using the LHCb RICH GDML, focusing on optical photon generation and transport across different offloading configurations.

Comparison Points

1. Physics Validation

• Number of optical photons generated (Geant4 vs Celeritas)
• Cherenkov ring reconstruction

2. Offloading Configurations

• Full offloading: EM shower and optical photon generation entirely handled by Celeritas
• Optical-only offloading Only optical track offloading to Celeritas

3. Performance
   Time to complete optical photon transportation and loading the geometry

Notes
Disable any output dumping (ROOT files, JSON records) in both Geant4 and Celeritas during timing runs to isolate transport performance
Record and compare the optical photon track.