Particle Physics Questions
Q10.
(a) The positive kaon, K+, has a strangeness of +1.
(i) What is the quark structure of the K+?
(1 mark)
(ii) What is the baryon number of the K+?
(1 mark)
(iii) What is the antiparticle of the K+?
(1 mark)
(b) The K+ may decay into a neutrino and an antimuon in the following way:
K+ → vμ + μ+
(i) Complete the table below using ticks and crosses as indicated in the first row.
Classification |
K+ |
vμ |
μ+ |
| lepton |
|
|
|
| charged particle |
|
|
|
| hadron |
|
|
|
| meson |
|
|
|
(3 marks)
(ii) In this decay, charge, energy and momentum are conserved. Give another quantity that is conserved in this decay and one that is not conserved.
(c) Another possible decay of the K+ is shown in the following equation,
K+ → π+ + X
(2 marks)
(i) Identify X by ticking one box from the following list.
| electron |
|
| muon |
|
| negative pion |
|
| neutral pion |
|
| neutrino |
|
| neutron |
|
| positron |
|
(1 mark)
(ii) Give one reason for your choice in part (c)(i).
(1 mark)
(Total 10 marks)
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