Difference between revisions of "Mattione Kaon PID Studies phi3(1850)"
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** Placed VERY wide cuts on the non-signal invariant mass peaks: reduces # of bogus track combinations to save time / cleanup histograms | ** 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% | ** Where kinematic fit: Require that the confidence level from the kinematic fit be > 1% | ||
| + | |||
| + | == Mass Peaks & Kinematic Fitting == | ||
| + | |||
| + | === genr8 φ<sub>3</sub>(1850) Signal === | ||
| + | |||
| + | === genr8 φ<sub>3</sub>(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. | ||
| + | |||
| + | === bggen Background === | ||
Revision as of 17:28, 13 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
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.
