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Chapter 12: Q32E (page 557)

(a) Determine the quark content of the antineutrons.

(b) Sketch the Feynman diagram for its β decay.

Short Answer

Expert verified

(a) The antineutron must be made ofu¯d¯d¯.

(b) The Feynman diagram is shown in the figure as:

Step by step solution

01

Given data 

The quark content of neutron isudd.

02

Concept of Feynman diagram

A Feynman diagram describes the interactions in quantum field theory. Solid lines, and curved lines are used to represent different types of particle interactions.

03

Step 3:Determine the quark content of the antineutrons 

(a)

We know that the quark content of neutron isudd.

This implies that the quark content of antineutron must beu¯d¯d¯.

The antineutron must be made of u¯d¯d¯.

04

Sketch Feynman vertex

(b)

The Feynman diagram is shown in figure 1.

Figure 1

This looks like the neutron decay diagram, except all the particles are changed to their antiparticle partners.

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