Particle Questions that include Feynman Diagrams

Q1.

(a)

(i) What class of particle is represented by the combination of three antiquarks ?

(ii) Name a hadron that has an antiparticle identical to itself.

(3 marks)

(b) The kaon K+ has a strangeness of +1.

(i) Give its quark composition.

(ii) The K+ may decay via the process . State the interaction responsible for this decay.

(iii) The K+ may also decay via the process . Change each particle in this equation to its corresponding antiparticle in order to complete an allowed decay process for the negative kaon K

(iv) Into what class of particle can both the μ+ and the νμ be placed?

(v) State one difference between a positive muon, μ+, and a positron, e+.

(6 marks)

(c) The diagram below shows a partially completed Feynman diagram of β- decay. Complete the diagram and label all the particles involved.

(3 marks)

(Total 12 marks)