Mattione Update 06202011

b1pi Overview

• Generated 10000 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-

Invariant Masses

• High mass tails due to incorrect photon reconstruction have been removed. These tails were due to photons in the FCAL being reconstructed with vertex-z = 0, such that they had bogus momentum vectors. This was fixed when Miha Kornicer recently updated the photon reconstruction code.

• Pi0 invariant mass:

pi0 06/01

pi0 Current

• X(2000) invariant mass:

X(2000) 06/01

X(2000) Current

Photons

generated, 06-12-2011

reconstructed 06-12-2011