Kinematic fitting charged particles 11/16/11

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Looking at an all charged particle final state to study the state of the tracking code: \gamma p -> pi+ pi+ pi- pi- p.

svn revision 8540

Kinematic fit

All combinations of track hypotheses that produce the correct final state are kinematically fit. Constraint is overall conservation of 4-momentum.

  • 41% of events have sufficient particles (>=3 positive tracks, >=2 negative tracks)
  • Of these, ?% have kinematic fit confidence level>1% (3% of total events)
  • <cl.png>?

3-momentum

Pt vs pz.png