Exercise 7: Trig functions
The quantity theta, or the angle that the beam makes with the z-axis, is calculated by:
The units are radians. Revise your script to include a histogram of theta.
I’ll make your life a little easier: the math function you want is
ROOT.TMath.ATan2(y,x), which computes the arctangent of y/x. It’s
better to use this function than
ROOT.TMath.ATan(y/x), because the
ATan2 function correctly handles the case when x=0.