Difference between revisions of "Mattione Study b1pi"
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− | + | == Overview == | |
* 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]. | * 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]. | ||
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− | + | == 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). | * 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]] |
Revision as of 15:12, 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
- # Photons per Event
- # π+'s per Event
- # π-'s per Event
- # Protons per Event
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 are matched with generated photons!!
- From matching thrown tree entries to reconstructed entries, should expect at least 100000 - (200000 - 174148) = 74148 events with 2+ photons, but get 57866 events with 2+ photons in the reconstructed tree 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, Δp (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 108308 reconstructed π+'s are matched with generated π+'s!!
- From matching thrown tree entries to reconstructed entries, 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:
- SUSPECT: I bet the spike in π+'s at #theta; ~= 0.77 rad are actually protons that were reconstructed with significantly lower momentum and were matched as π+'s.
- 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, Δp (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 153185 reconstructed π-'s.
- However, only 107761 reconstructed π-'s are matched with generated π-'s!!
- From matching thrown tree entries to reconstructed entries, would expect at least 100000 - (200000 - 153185) = 53185 events with 2+ π-'s, but get 30634 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, Δp (generated - reconstructed) vs generated p:
Protons
- 100000 generated events, 1 proton per event: 100000 generated protons
- In thrown tree, the generated protons are matched with XXX reconstructed protons.
- However, only XXX reconstructed protons are matched with generated protons!!
- From matching thrown tree entries to reconstructed entries, should expect at least 100000 - (100000 - XXX) = XXX events with 1+ protons, but get XXX events with 1+ protons in the reconstructed tree instead.
- Matching suspect, so following distributions may be suspect as well.
- For each of the generated protons that were matched with reconstructed protons, the generated p vs θ distribution:
- For each of the generated protons that were matched with reconstructed protons, the reconstructed p vs θ distribution:
- For each of the generated protons that were NOT matched with reconstructed protons, the generated p vs θ distribution:
- For each of the generated protons that were matched with reconstructed protons, Δp (generated - reconstructed) vs generated p: