Difference between revisions of "Mattione Study b1pi"
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| − | * Generated 100000 X(2000) -> | + | * 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]. |
* Decay chain: | * Decay chain: | ||
<pre> | <pre> | ||
| − | gamma p -> p X(2000)0 | + | gamma p -> p X(2000)<sup>0</sup> |
| | | | ||
| − | |-> b1(1235)+ pi- | + | |-> b1(1235)+ π<sup>-</sup> |
| | | | ||
| − | |-> omega pi+ | + | |-> ω π<sup>+</sup> |
| | | | ||
| − | |-> | + | |-> ρ<sup>0</sup> π<sup>0</sup> |
| − | | |-> gamma gamma | + | | |-> γ γ |
| | | | ||
| − | |-> pi+ pi- | + | |-> π<sup>+</sup> π<sup>-</sup> |
</pre> | </pre> | ||
| Line 19: | Line 19: | ||
# Events with 2+ photons = 57866 | # Events with 2+ photons = 57866 | ||
| − | # Events with 2+ pi+ = 29372 | + | # Events with 2+ π<sup>+</sup>'s = 29372 |
| − | # Events with 2+ pi- = 30634 | + | # Events with 2+ π<sup>-</sup>'s = 30634 |
| − | # Events with enough tracks for the X (2+ photons, 2+ pi+'s, 2+ pi-'s) = 4760 | + | # 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 | + | # Events with at least one π<sup>0</sup> candidate: 57866 |
| − | # Events with at least one | + | # Events with at least one ρ<sup>0</sup> candidate: 58466 |
| − | # Events with at least one omega candidate: 31012 | + | # Events with at least one ω candidate: 31012 |
| − | # Events with at least one | + | # Events with at least one b<sub>1</sub> candidate: 12163 |
| − | # Events with at least one X(2000)0 candidate: 4760 | + | # Events with at least one X(2000)<sup>0</sup> candidate: 4760 |
</pre> | </pre> | ||
=== Invariant Masses === | === Invariant Masses === | ||
| − | * | + | * π<sup>0</sup>: Filled for all events with > 1 photon, filled for all possible photon combinations (so if three photons in an event, will fill 3 times). |
[[Image:Mattione_Study_b1pi_InvMass_PiZero.gif|thumb|left|400px]] | [[Image:Mattione_Study_b1pi_InvMass_PiZero.gif|thumb|left|400px]] | ||
<br style="clear:both;"/> | <br style="clear:both;"/> | ||
| − | * | + | * ρ<sup>0</sup>: Filled for all events with at least one π<sup>+</sup> and at least one π<sup>-</sup>, filled for all possible pion combinations (so if two π<sup>+</sup>'s and two π<sup>-</sup>'s in an event, will fill 4 times). |
[[Image:Mattione_Study_b1pi_InvMass_RhoZero.gif|thumb|left|400px]] | [[Image:Mattione_Study_b1pi_InvMass_RhoZero.gif|thumb|left|400px]] | ||
<br style="clear:both;"/> | <br style="clear:both;"/> | ||
| − | * | + | * ω: Filled for all events with at least: one π<sup>+</sup>, one π<sup>-</sup>, and two photons. Filled for all possible ρ<sup>0</sup> combinations, but for events with multiple π<sup>0</sup> candidates the π<sup>0</sup> with the closest mass was chosen. |
[[Image:Mattione_Study_b1pi_InvMass_Omega.gif|thumb|left|400px]] | [[Image:Mattione_Study_b1pi_InvMass_Omega.gif|thumb|left|400px]] | ||
<br style="clear:both;"/> | <br style="clear:both;"/> | ||
| − | * | + | * b<sub>1</sub>: Filled for all events with at least: two π<sup>+</sup>'s, one π<sup>-</sup>, and two photons. Filled for all possible combinations of these tracks (regardless of which π<sup>+</sup> formed the Rho0). |
[[Image:Mattione_Study_b1pi_InvMass_B1Plus.gif|thumb|left|400px]] | [[Image:Mattione_Study_b1pi_InvMass_B1Plus.gif|thumb|left|400px]] | ||
<br style="clear:both;"/> | <br style="clear:both;"/> | ||
| − | * X(2000)0: Filled for all events with at least: two pi+, two pi-, and two photons. Filled for all possible combinations of these tracks (regardless of which pi+ & pi- formed the Rho0). | + | * X(2000)<sup>0</sup>: Filled for all events with at least: two π<sup>+</sup>'s, two π<sup>-</sup>'s, and two photons. Filled for all possible combinations of these tracks (regardless of which π<sup>+</sup> & π<sup>-</sup> formed the Rho0). |
[[Image:Mattione_Study_b1pi_InvMass_X2000.gif|thumb|left|400px]] | [[Image:Mattione_Study_b1pi_InvMass_X2000.gif|thumb|left|400px]] | ||
<br style="clear:both;"/> | <br style="clear:both;"/> | ||
Revision as of 13:39, 23 May 2011
- Generated 100000 X(2000) -> b1π events following the instructions here.
- Decay chain:
gamma p -> p X(2000)<sup>0</sup>
|
|-> b1(1235)+ π<sup>-</sup>
|
|-> ω π<sup>+</sup>
|
|-> ρ<sup>0</sup> π<sup>0</sup>
| |-> γ γ
|
|-> π<sup>+</sup> π<sup>-</sup>
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:
