Particle Physics Questions
Q5.
Sub-atomic particles can either be hadrons or leptons.
(a) State one difference between these two groups of particles.
Leptons do not experience the strong interaction but hadrons do.![](../../../graphics/symbols/nuclides/ticksmall.png)
or
Hadrons are not fundamental particles. They are made up of quarks but leptons are fundamental. ![](../../../graphics/symbols/nuclides/ticksmall.png)
(1 mark max)
(b) Give an example of
(i) a non-strange hadron proton, neutron or pion ![](../../../graphics/symbols/nuclides/ticksmall.png)
(ii) an example of a lepton electron, muon, tauon or neutrino (tau, mu or electron variety)![](../../../graphics/symbols/nuclides/ticksmall.png)
(2 marks)
(c) Hadrons can be further divided into two groups. Name these two groups and state a difference between them.
Baryons
Mesons
Baryons are made from three quarks (or three antiquarks) whereas mesons are a quark–antiquark pair
or
Baryons have baryon number of +1 or –1 (for the antibaryon) whereas mesons have baryon number 0 ![](../../../graphics/symbols/nuclides/ticksmall.png)
(3 marks)
(Total 6 marks)