Difference between revisions of "Mattione Kaon PID Studies eta1Prime(2300)"

Revision as of 21:30, 14 September 2012

γ p → η'₁(2300), p
- η'₁(2300) → K*(892)⁰, K⁰_bar
  - K*(892)⁰ → K⁺, π^-
    - K⁰_bar → π⁺, π^-
Final State: p, K⁺, π^-, π⁺, π^-
Events generated with: Γ_η'₁(2300) = 200 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
- EXTREMELY loose mass cuts around each mass peak (typically at the histogram edges): saves time by reducing # of kinematic fits to perform
- Require the combined FOM for PID (χ² and NDF of all tracks summed together) be > 1%
- Where kinematic fit: Require that the confidence level from the kinematic fit be > 1%
- Mass cuts as illustrated.

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 * 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
+** EXTREMELY loose mass cuts around each mass peak (typically at the histogram edges): saves time by reducing # of kinematic fits to perform
 ** Require the combined FOM for PID (&chi;<sup>2</sup> 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 cuts as illustrated.