Difference between revisions of "Mattione Study b1pi"

Revision as of 10:32, 25 May 2011

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

• 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

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, 15959 with code from 05-24-11 at 16:11

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, 7003 with code from 05-24-11 at 16:11

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, 2715 with code from 05-24-11 at 16:11

sim-recon-2011-03-31

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:

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:

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:

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:

Δp (generated - reconstructed) vs generated p