| Date | May 2012 | Marks available | 3 | Reference code | 12M.3.HL.TZ1.19 |
| Level | Higher level | Paper | Paper 3 | Time zone | Time zone 1 |
| Command term | State | Question number | 19 | Adapted from | N/A |
Question
This question is about conservation laws and the standard model.
A muon decays into an electron and two other particles according to the reaction equation μ−→e−+?+?.
State the names of the two other particles that are produced in this decay explaining your answer.
Markscheme
muon neutrino;
electron antineutrino;
so that (family) lepton number is conserved;
Do not accept particle symbols only.
Examiners report
[N/A]
Syllabus sections
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