Mattione Kaon PID Studies h2Prime(2600)

Reaction

• γ p → h'₂(2600), p
  • h'₂(2600) → K₁(1400)⁺, K^-
    • K₁(1400)⁺ → K*(892)⁰, π⁺
      • K*(892)⁰ → K⁺, π^-
• Final State: p, K^-, π⁺, K⁺, π^-
• Events generated with: Γ_h'2(2600) = 100 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%