1. Measuring 3 rd Euler Angle 1 st : Rotate around Z Axis by Phi 2 nd : Rotate around Y' Axis by Theta. 3 rd : Measure angle from X' axis to the Decay Particle. (Both should be in the Plane of decay)‏ Z X Y Z' (Normal to Decay Plane)‏ X' (In Decay Plane)‏ Y' (In Decay Plane)‏ Decay Particle 1

2. Euler Angles Distribution - Cos distribution for Theta -Uniform Distribution for Phi

3. Euler Angles Distribution II - Only looking at the Psi distribution for a small window of Theta and Phi, (Three body decays with similar decay plane orientation) -The distribution looks uniform.