Particle Interactions & Conservation (Edexcel A Level Physics)

A negatively charged pion decays into a muon and an antineutrino. The diagram shows tracks in a particle detector formed in such an event.

According to the standard model, the pion and muon are classified within two different groups of particles. 

State which group each particle belongs to and describe the two groups.

Determine the magnetic flux density of the magnetic field which acts in the detector and state its direction.

Scale of diagram 1 cm represents 10 cm

pion charge = −1.6 × 10⁻¹⁹ C

Magnetic flux density = ......................................................

Direction of magnetic field = ................................................................

The initial momentum of the muon is 1.59 × 10⁻¹⁹ N s.

Momentum of antineutrino = ................................................

Direction of antineutrino = ...............................................