Kinematic fitting of ρ and b1π events

ρ events

• Generated 100000 events with genr8
• Require pπ+π-, each with tracking CL>0.001
• 4C kinematic fit (nothing missing)

b1π events

• Generated 100000 events with genr8
• Require p2π+2π-, each with tracking CL>0.001
  • Use default PID algorithm
• 1C kinematic fit (missing π0)

Missing mass squared for the reaction γp->p2π+π-(X). Red histogram is after cutting on CL from kinematic fitting at 0.01.

Black histogram uses momenta from tracking reconstruction; red histogram uses refined momenta returned by kinematic fitting code