On a somewhat related note -- if we have a 4pi p final state
with
a cross section that is 10 x that for 2pi2K p (see Table 6) in
the
overview document - how effectively does kinematic fitting
remove
the latter reaction as a 10% background contribution for the
former
without PID info except for TOF in the forward direction.
Another
way to put it is how well can we insure "pion purity".
Do you have
a feel for this? You can imagine a resonant structure
in the latter
reaction showing up as a 10% or so signal in the former as
a
false peak after a PWA.