Measurement of Charge and Momentum
The inner parts of the detector, especially the tracking device,
are in a strong magnetic field.
The signs of the charged particles can easily be read from their paths,
since positive and negative particles curve in opposite directions in
the same magnetic field.
The momenta of particles can be calculated since the paths of particles
with greater momentum bend less than those of lesser momentum.
Question: In what direction does the path of a neutral particle bend
in a magnetic field?