Difference between revisions of "Mattione Kaon PID Studies phi3(1850)"
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=== φ<sub>3</sub>(1850) Signal === | === φ<sub>3</sub>(1850) Signal === | ||
− | + | ||
− | 1 | + | * % of generated events remaining after all cuts (including a final cut requiring that all tracks have the correct THROWN PID) |
+ | {| border="1" cellpadding="2" align="left" valign="top" style="text-align:center;" | ||
+ | !width="350"| Missing p, No KinFit | ||
+ | !width="350"| Missing p, P4 KinFit | ||
+ | !width="350"| Missing p, VertexP4 KinFit | ||
+ | !width="350"| No Missing, No KinFit | ||
+ | !width="350"| No Missing, P4 KinFit | ||
+ | !width="350"| No Missing, VertexP4 KinFit | ||
+ | |- | ||
+ | | a% || b% || c% || d% || e% || f% | ||
+ | |} | ||
+ | <br style="clear:both;"/> |
Revision as of 20:57, 14 September 2012
Contents
Reaction
- γ p → φ3(1850), p
- φ3(1850) → K+, K-
- Final State: p, K+, K-
- Events generated with: Γφ3(1850) = 87 MeV/c2, t-slope = 5.0, 50.0 < Vertex-Z (cm) < 80.0
Analysis Overview
- For each q = +/- particle in the reaction, all detected q = +/- tracks are tested as to whether or not they are that particle
- e.g. If a q = + track has PID FOM > 1% for both the π+ & K+: allow both combinations (DO NOT take the best FOM as true!)
- Maximum of 8 tracks per event (to cut down on memory spikes).
- The analysis (cuts/histing/kinfits) is then performed on each possible track combination (events are only cut if every one of their track combinations is cut):
- Required 45.0 < Track-Vertex-Z (cm) < 85.0
- Require the combined FOM for PID (χ2 and NDF of all tracks summed together) be > 1%
- Placed VERY wide cuts on the non-signal invariant mass peaks: reduces # of bogus track combinations to save time / cleanup histograms
- Where kinematic fit: Require that the confidence level from the kinematic fit be > 1%
Mass Peaks & Kinematic Fitting
genr8 φ3(1850) Signal
- Kinematic Fit Confidence Level (Zoomed in; spike at 0 confidence is well off the top of the plot)
Recoil p | P4 KinFit | VertexP4 KinFit |
---|---|---|
Missing | ||
Not Missing |
- Missing Mass & Missing Mass Squared (Before/after KinFit where present)
Recoil p | No KinFit | P4 KinFit | VertexP4 KinFit |
---|---|---|---|
Missing | |||
Not Missing |
- φ3(1850) Invariant Mass (Before/after KinFit where present)
Recoil p | No KinFit | P4 KinFit | VertexP4 KinFit |
---|---|---|---|
Missing | |||
Not Missing |
genr8 φ3(1850) Background
- Generate pions instead of kaons, shift generated mass peaks so that when the kaon mass is assigned to the kaon candidates (pions), the mass peaks shift to the original signal masses.
- Note that it is impossible to get every peak to line up without generated a recoil proton with a bogus mass. Therefore, the missing mass peak is slightly off.
- Kinematic Fit Confidence Level (Zoomed in; spike at 0 confidence is well off the top of the plot)
Recoil p | P4 KinFit | VertexP4 KinFit |
---|---|---|
Missing | ||
Not Missing |
- Missing Mass & Missing Mass Squared (Before/after KinFit where present)
Recoil p | No KinFit | P4 KinFit | VertexP4 KinFit |
---|---|---|---|
Missing | |||
Not Missing |
- φ3(1850) Invariant Mass (Before/after KinFit where present)
Recoil p | No KinFit | P4 KinFit | VertexP4 KinFit |
---|---|---|---|
Missing | |||
Not Missing |
bggen Background
- Kinematic Fit Confidence Level (Zoomed in; spike at 0 confidence is well off the top of the plot)
Recoil p | P4 KinFit | VertexP4 KinFit |
---|---|---|
Missing | ||
Not Missing |
- Missing Mass & Missing Mass Squared (Before/after KinFit where present)
Recoil p | No KinFit | P4 KinFit | VertexP4 KinFit |
---|---|---|---|
Missing | |||
Not Missing |
- φ3(1850) Invariant Mass (Before/after KinFit where present)
Recoil p | No KinFit | P4 KinFit | VertexP4 KinFit |
---|---|---|---|
Missing | |||
Not Missing |
Cherenkov Detector Comparison: genr8 φ3(1850) Background
- P vs. θ of π+'s as K+ candidates ("All" means all post-analysis cuts, pre-Cherenkov cuts)
- π-'s as K- not shown: identical due to symmetry.
π+ as K+ | No Missing, P4 KinFit | No Missing, VertexP4 KinFit | p Missing, P4 KinFit | p Missing, VertexP4 KinFit |
---|---|---|---|---|
All | ||||
He DC | ||||
Gas Thresh. | ||||
RICH (Yi) | ||||
LHCb RICH |
Cherenkov Detector Comparison: bggen Background
- P vs. θ of π+'s as K+ candidates ("All" means all post-analysis cuts, pre-Cherenkov cuts)
- π-'s as K- not shown: identical due to symmetry.
π+ as K+ | No Missing, P4 KinFit | No Missing, VertexP4 KinFit | p Missing, P4 KinFit | p Missing, VertexP4 KinFit |
---|---|---|---|---|
All | ||||
He DC | ||||
Gas Thresh. | ||||
RICH (Yi) | ||||
LHCb RICH |
Yields
- All yields are defined in the signal region
φ3(1850) Signal
- % of generated events remaining after all cuts (including a final cut requiring that all tracks have the correct THROWN PID)
Missing p, No KinFit | Missing p, P4 KinFit | Missing p, VertexP4 KinFit | No Missing, No KinFit | No Missing, P4 KinFit | No Missing, VertexP4 KinFit |
---|---|---|---|---|---|
a% | b% | c% | d% | e% | f% |