Likelihood separation as a function of the lens parameters for different polar angles of the charged particles. The systematic shift of the Cherenkov angle is corrected.
r1 is a radius of Fused Silica part of the lens; r2 - PBF2. Color indicate the Likelihood separation (in sigmas) between kaons and pions at 3.5 GeV/c.
Reconstructed Cherenkov angle before and after correction (red-kaons,blue-pions):
