Mattione Study b1pi

Overview

• Generated 100000 X(2000) -> b₁π^-; events following the instructions here.
  • Except ran by linking against the sim-recon-2011-03-31 build. All plots & statistics are from this build unless indicated otherwise.
• Decay chain:

 gamma p -> p X(2000)0
               |
               |-> b1(1235)+ π-
                    |
                    |-> ω π+
                          |
                          |-> ρ0 π0
                               |   |-> γ γ
                               |
                               |-> π+ π-

Event Count

# Generated events = 100000

# Events with 2+ photons = 57866
# Events with 2+ π+'s = 29372
# Events with 2+ π-'s = 30634
# Events with enough tracks for the X (2+ photons, 2+ π+'s, 2+ π-'s) = 4760

# Events with at least one π0 candidate: 57866
# Events with at least one ρ0 candidate: 58466
# Events with at least one ω candidate: 31012
# Events with at least one b1 candidate: 12163
# Events with at least one X(2000)0 candidate: 4760

• # Photons per Event

• # π⁺'s per Event

• # π^-'s per Event

• # Protons per Event

Invariant Masses

π⁰

• π⁰: Filled for all events with > 1 photon, filled for all possible photon combinations (so if three photons in an event, will fill 3 times).
• # Events with at least one π⁰ candidate: 57866 with sim-recon-2011-03-31, 31071 with code from 05-24-11 at 16:11 (but photon P & E = 0!!)

sim-recon-2011-03-31

ρ⁰

• ρ⁰: Filled for all events with at least one π⁺ and at least one π^-, filled for all possible pion combinations (so if two π⁺'s and two π^-'s in an event, will fill 4 times).
• # Events with at least one ρ⁰ candidate: 58466 with sim-recon-2011-03-31, 59178 with code from 05-24-11 at 16:11

sim-recon-2011-03-31

ω

• ω: Filled for all events with at least: one π⁺, one π^-, and two photons. Filled for all possible ρ⁰ combinations, but for events with multiple π⁰ candidates the π⁰ with the closest mass was chosen.
• # Events with at least one ω candidate: 31012 with sim-recon-2011-03-31

sim-recon-2011-03-31

b₁

• b₁: Filled for all events with at least: two π⁺'s, one π^-, and two photons. Filled for all possible combinations of these tracks (regardless of which π⁺ formed the ρ⁰).
• # Events with at least one b₁ candidate: 12163 with sim-recon-2011-03-31

sim-recon-2011-03-31

X(2000)⁰

• X(2000)⁰: Filled for all events with at least: two π⁺'s, two π^-'s, and two photons. Filled for all possible combinations of these tracks (regardless of which π⁺ & π^- formed the Rho0).
• # Events with at least one X(2000)⁰ candidate: 4760 with sim-recon-2011-03-31

sim-recon-2011-03-31

Comparison of Generated and Reconstructed Tracks

• NOTE: There was no observed φ-dependence on track reconstruction distributions.