CyDet

• Cylindrical Drift Chamber in a 1 Tesla solenoidal field, surrounding a target made of several thin Aluminium

disks, in which the beam muons stop and form muonic atoms

• geometric pT cut-off for background rejection
• prompt beam pulse avoids active detector components

• Scintillator & Cherenkov Hodoscope to allow triggering on electrons above the transverse momentum threshold

• Makes use of Belle II Central Drift Chamber experience & construction facilities at KEK

• Undergoing detailed design optimisation