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 ![](../../../graphics/symbols/nuclides/ticksmall.png)
Baryon number ![](../../../graphics/symbols/nuclides/ticksmall.png)
Charge ![](../../../graphics/symbols/nuclides/ticksmall.png)
Strangeness ![](../../../graphics/symbols/nuclides/ticksmall.png)
(3 marks maximum)
(b) Draw the Feynman diagram that corresponds to the positron emission represented in the equation.
![](11.png)
(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)