PID capability on test beam data
From typical values (single photon
resolution 13mrad and 6 detected
photons) we can estimate the
Cherenkov resolution per track:
5.3mrad;
-> 4.3sigma p/K separation a 4GeV/c.
Illustration of PID performance: Cherenkov angle distribution for
pions at 4GeV/c and 'kaons' (pions at 1.1GeV/c with the same
Cherenkov angle as kaons at  4GeV/c).                 Details: NIM paper
Photon detector: array of 16 H8500 PMTs