The neutral meson η c = c c ¯ is its own anti-particle, but the neutral K 0 = d s ¯ is not. Explain why.

The anti-particle of η c has the structure of c c ¯ , which is the same as the structure of η c , i.e c c ¯ . On the other hand, the anti-particle of K 0 has the structure of d ¯ s , which has a different strangeness than that of K 0 .

Beta-minus decay involves the decay of a neutron into a proton according to the reaction n → p + + e - + v e ¯ Draw a Feynman diagram for the process.

In the given reaction, a d quark turns into u quark by emitting a W - boson. Then, the materializes into an electron and an electron anti-neutrino, as in the diagram below

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Physics for the IB Diploma 6th Edition>Chapter 7 - Atomic, Nuclear and Particle Physics>Test yourself>Q 37

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The neutron is electrically neutral. Could it possibly have electromagnetic interactions?

Important Questions on Atomic, Nuclear and Particle Physics

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Physics for the IB Diploma 6th Edition>Chapter 7 - Atomic, Nuclear and Particle Physics>Test yourself>Q 38

The neutral meson

η_{c} = (c \bar{c})

is its own anti-particle, but the neutral

K^{0} = (d \bar{s})

is not. Explain why.

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Physics for the IB Diploma 6th Edition>Chapter 7 - Atomic, Nuclear and Particle Physics>Test yourself>Q 39

Outline what is meant by the term confinement in the context of the quarks.

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Physics for the IB Diploma 6th Edition>Chapter 7 - Atomic, Nuclear and Particle Physics>Test yourself>Q 39

The Feynman diagram shows the decay of a quark-anti-quark pair in a meson into two gluons. With might happen to the gluons produced in this decay.

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Physics for the IB Diploma 6th Edition>Chapter 7 - Atomic, Nuclear and Particle Physics>Test yourself>Q 41

Describe the significance of the Higgs particle in the standard model of the quarks and leptons.

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Physics for the IB Diploma 6th Edition>Chapter 7 - Atomic, Nuclear and Particle Physics>Test yourself>Q 42

Use the electromagnetic vertex to draw a Feynman diagram for the scattering of a photon off a positron.

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Physics for the IB Diploma 6th Edition>Chapter 7 - Atomic, Nuclear and Particle Physics>Test yourself>Q 43

Beta-minus decay involves the decay of a neutrino into a proton according to the reaction

$n \to p^{+} + e^{-} + {\bar{v}}_{e}$

Describe this decay in terms of quarks.

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Physics for the IB Diploma 6th Edition>Chapter 7 - Atomic, Nuclear and Particle Physics>Test yourself>Q 43

Beta-minus decay involves the decay of a neutron into a proton according to the reaction

$n \to p^{+} + e^{-} + \bar{v_{e}}$

Draw a Feynman diagram for the process.

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Physics for the IB Diploma 6th Edition>Chapter 7 - Atomic, Nuclear and Particle Physics>Test yourself>Q 44

Using the basic weak interaction vertex involving W boson and two quarks or leptons given in the figure below, draw Feynman diagram to represent the following process.

$μ^{-} \to e^{-} + {\bar{v}}_{e} + v_{μ}$

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