| Date | May 2014 | Marks available | 2 | Reference code | 14M.3.HL.TZ1.26 |
| Level | Higher level | Paper | Paper 3 | Time zone | Time zone 1 |
| Command term | Outline and State | Question number | 26 | Adapted from | N/A |
Question
This question is about the standard model.
The Feynman diagrams show two electroweak interactions between electrons. The particle represented by the wavy line is a photon.
State
(i) the name of the exchange particle represented by the dotted line.
(ii) one difference between the two exchange particles.
[2]
a.
Outline how the observation of the interaction represented by the diagram with the dotted line provides evidence for the standard model.
[2]
b.
Markscheme
(i) Z (boson) / Z0 / boson;
(ii) Z is massive/has mass;
a.
neutral current interaction (mentioned);
which is only observed with a weak/electroweak (interaction);
as predicted by the standard model;
b.
Examiners report
This was generally well answered by well prepared candidates. Many identified the Z boson in (a)(i).
a.
In (b), incorrect answers were rare. Candidates with sound knowledge answered well and others did not answer at all.
b.
Syllabus sections
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