Mattione Update 06252012

Reaction

• γ p → Y(2175), p
  • Y(2175) → π⁺, π^-, φ
    • φ → K⁺, K^-
• Final State: p, π⁺, π^-, K⁺, K^-
• Events Generated using genr8 with: 9 GeV Photons, Γ_Y(2175) = 61 MeV/c², t-slope = 5.0, 50.0 < Vertex-Z (cm) < 80.0

Analysis Overview

• Require the combined FOM for PID (π⁺, π^-, K⁺, K^-) be > 1%
• Place very loose cuts on the φ invariant mass (0.8 - 1.3) and p missing mass (0.5 - 1.4): reduces # of bogus track combinations to save time / cleanup histograms
• Kinematic Fit: 4-momentum conservation: p missing mass, φ invariant mass
• Require that the confidence level from the kinematic fit be > 1%

Thrown Track Parameters

• p vs θ

PID

• PID FOM