Mattione Kaon PID Studies Y2175

Reaction

γ p → Y(2175), p
- Y(2175) → π⁺, π^-, φ
  - φ → K⁺, K^-
Final State: p, π⁺, π^-, K⁺, K^-
Events generated with: Γ_Y(2175) = 61 MeV/c², t-slope = 5.0, 50.0 < Vertex-Z (cm) < 80.0

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%