Difference between revisions of "Mattione Study b1pi"
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=== Overview === | === Overview === | ||
− | * Generated 100000 X(2000) -> b<sub>1</sub>&pi<sup>-</sup>; events following the instructions [http://www.jlab.org/Hall-D/software/wiki/index.php/HOWTO_simulate_and_analyze_b1pi_events here]. | + | * Generated 100000 X(2000) -> b<sub>1</sub>π<sup>-</sup>; events following the instructions [http://www.jlab.org/Hall-D/software/wiki/index.php/HOWTO_simulate_and_analyze_b1pi_events here]. |
* Decay chain: | * Decay chain: | ||
<pre> | <pre> |
Revision as of 13:57, 23 May 2011
Contents
Overview
- Generated 100000 X(2000) -> b1π-; events following the instructions here.
- 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
Invariant Masses
- 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).
- 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).
- 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.
- 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 Rho0).
- 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).
Comparison of Generated and Reconstructed Tracks
- NOTE: There was no observed φ-dependence on track reconstruction distributions.
Photons
- 100000 generated events, 2 photons per event: 200000 generated photons
- In thrown tree, the generated photons are matched with 174148 reconstructed photons.
- However, only 170870 reconstructed photons in the "recon" tree!
- Would expect at least 100000 - (200000 - 174148) = 74148 pi0 events, but get 57866 events with 2+ photons instead
- Matching suspect, so following distributions may be suspect as well.
- For each of the generated photons that were matched with reconstructed photons, the generated p vs θ distribution:
- For each of the generated photons that were matched with reconstructed photons, the reconstructed p vs θ distribution:
- For each of the generated photons that were NOT matched with reconstructed photons, the generated p vs θ distribution:
- For each of the generated photons that were matched with reconstructed photons, delta-p (generated - reconstructed) vs generated p:
π+'s
- 100000 generated events, 2 π+'s per event: 200000 generated π+'s
- In thrown tree, the generated π+'s are matched with 151234 reconstructed π+'s.
- However, only XXX reconstructed π+'s in the "recon" tree!
- UPDATE: Would expect at least 100000 - (200000 - 151234) = 51234 events with 2+ π+'s, but get 29372 events with 2+ π+'s in reconstructed tree instead
- Matching suspect, so following distributions may be suspect as well.
- For each of the generated π+'s that were matched with reconstructed π+'s, the generated p vs θ distribution:
- For each of the generated π+'s that were matched with reconstructed π+'s, the reconstructed p vs θ distribution:
- For each of the generated π+'s that were NOT matched with reconstructed π+'s, the generated p vs θ distribution:
- For each of the generated π+'s that were matched with reconstructed π+'s, delta-p (generated - reconstructed) vs generated p: