Basic Requirements

• hermetic detector with nearly 4pi solid angle coverage
• concurrent detection of lepton pairs
• good kaon identification from very low energies up to a few GeV/c
• detection of low energy photons
• muon detection capability
• higly segmented low energy threshold electromagnetic calorimeter
• (second) vertex recognition
• radiation hardness

• good PID above particle momenta of 0.5 GeV/c at all angles

Examples

• Momentum vs. polar angle distribution of muons from formation reaction of the psi(3686)(Ref. TPR):
  

• example for typical momenta

• Momentum vs. polar angle distribution of decay kaons from the reaction pbar p -> Phi Phi -> 4K at sqrt s = 3.6GeV(Ref. TPR):
  

• The distribution demonstrates the need for pion-kaon separation up to ~ 3 GeV/c at forward angles.

• Transverse vs. longitudinal momentum distribution of neutrons obtained with an UrQMD calculation for 4.05GeV/c pbar * Cu, including low energy evaporation processes(Ref. TPR):
  

• a similar emission pattern is predicted for the dominant low energy part of the emitted protons