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Particle Questions that include Feynman Diagrams

Q6.The equation represents the emission of a positron from a proton.

(a) Energy and momentum are conserved in this emission. What other quantities are conserved in this emission?

Lepton number

Baryon number

Charge

Strangeness

(3 marks maximum)

(b) Draw the Feynman diagram that corresponds to the positron emission represented in the equation.

(4 marks)

(c) Complete the following table using ticks and crosses.

particle

fundamental particle

meson

baryon

lepton

p

X

 X

 

X 

n

X 

 X

 

X 

β +

 

 X

X 

 

νe

 

 X

X 

 

 

One mark for each correct line - all ticks and crosses must be correct for a particular particle to get the mark.

(4 marks)

(Total 11 marks)