Difference between revisions of "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. | 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 | + | *50,000 events |
| + | *svn revision 8540 | ||
==Kinematic fit== | ==Kinematic fit== | ||
All combinations of track hypotheses that produce the correct final state are kinematically fit. Constraint is overall conservation of 4-momentum. | 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) | *41% of events have sufficient particles (>=3 positive tracks, >=2 negative tracks) | ||
| − | *Of these, | + | *Of these, 9% have kinematic fit confidence level>1% (4% of total events) |
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==3-momentum== | ==3-momentum== | ||
| + | Kinematic fit is dependent on errors, PID. Try to simplify things... | ||
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| + | Look at events with exactly 5 tracks (3 positive, 2 negative) and look at sum of reconstructed 3-momentum from all tracks. | ||
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[[Image:Pt_vs_pz.png]] | [[Image:Pt_vs_pz.png]] | ||
Revision as of 14:31, 16 November 2011
Reaction
Looking at an all charged particle final state to study the state of the tracking code: \gamma p -> pi+ pi+ pi- pi- p.
- 50,000 events
- 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, 9% have kinematic fit confidence level>1% (4% of total events)
3-momentum
Kinematic fit is dependent on errors, PID. Try to simplify things...
Look at events with exactly 5 tracks (3 positive, 2 negative) and look at sum of reconstructed 3-momentum from all tracks.
