Difference between revisions of "Mattione Study b1pi"
From GlueXWiki
Line 1: | Line 1: | ||
− | * Generated 100000 X(2000) -> b<sub>1</sub>π 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>&pi<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> | ||
− | gamma p -> p X(2000) | + | gamma p -> p X(2000)0 |
| | | | ||
− | |-> b1(1235)+ π | + | |-> b1(1235)+ π- |
| | | | ||
− | |-> ω π | + | |-> ω π+ |
| | | | ||
− | |-> ρ | + | |-> ρ0 π0 |
| |-> γ γ | | |-> γ γ | ||
| | | | ||
− | |-> π | + | |-> π+ π- |
</pre> | </pre> | ||
Revision as of 13:40, 23 May 2011
- Generated 100000 X(2000) -> b1&pi-; events following the instructions here.
- Decay chain:
gamma p -> p X(2000)0 | |-> b1(1235)+ π- | |-> ω π+ | |-> ρ0 π0 | |-> γ γ | |-> π+ π-
Contents
Event Count
# Generated events = 100000 # Events with 2+ photons = 57866 # Events with 2+ π<sup>+</sup>'s = 29372 # Events with 2+ π<sup>-</sup>'s = 30634 # Events with enough tracks for the X (2+ photons, 2+ π<sup>+</sup>'s, 2+ π<sup>-</sup>'s) = 4760 # Events with at least one π<sup>0</sup> candidate: 57866 # Events with at least one ρ<sup>0</sup> candidate: 58466 # Events with at least one ω candidate: 31012 # Events with at least one b<sub>1</sub> candidate: 12163 # Events with at least one X(2000)<sup>0</sup> 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
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 theta distribution:
- For each of the generated photons that were matched with reconstructed photons, the reconstructed p vs theta distribution:
- For each of the generated photons that were NOT matched with reconstructed photons, the generated p vs theta 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 XXX reconstructed π+'s.
- However, only XXX reconstructed π+'s in the "recon" tree!
- Would expect at least 100000 - (200000 - XXX) = 74148 pi0 events, but get XXX events with 2+ photons 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 theta distribution:
- For each of the generated π+'s that were matched with reconstructed π+'s, the reconstructed p vs theta distribution:
- For each of the generated π+'s that were NOT matched with reconstructed π+'s, the generated p vs theta distribution:
- For each of the generated π+'s that were matched with reconstructed π+'s, delta-p (generated - reconstructed) vs generated p: