| Date | May 2015 | Marks available | 1 | Reference code | 15M.3.HL.TZ1.25 |
| Level | Higher level | Paper | Paper 3 | Time zone | Time zone 1 |
| Command term | State | Question number | 25 | Adapted from | N/A |
Question
This question is about a K meson decay.
The positive kaon K+ has a strangeness of +1. It can decay through the interaction
K+ → μ+ + νμ.
Charge, energy and momentum are conserved in this decay.
State the quark structure of the K+.
[1]
a.
Deduce one further quantity in this decay that is
(i) conserved.
(ii) not conserved.
[2]
b.
Markscheme
\(u\overline s \);
a.
(i) baryon/lepton number / colour;
(ii) strangeness;
b.
Examiners report
[N/A]
a.
[N/A]
b.
Syllabus sections
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