Which of the following are examples of interactions that would occur in the earl

Question

Which of the following are examples of interactions that would occur in the early universe, less than a millionth of a second after the big bang? Select all that apply

1. An electron and a positron meet and turn into a Z-boson which then turns into another electron/positron pair
2. An up quark and an anti-up quark meet and turn into a Z-boson which then turns into a muon and anti-muon pair
3. An electron and a proton meet and become a hydrogen atom, then a photon comes and “knocks out” the electron
4. A down quark in a neutron emits a W boson and becomes an up quark
5. An electron and a positron meet and turn into a Z-boson which then turns into a muon and anti-muon pair

Which of the following particles would be fundamental particles? Select all that apply

1. A supersymmetric electron
2. A supersymmetric atom
3. A supersymmetric anti-quark
4. A supersymmetric quark
5. A supersymmetric photon
6. A supersymmetric positron
7. A supersymmetric pion

Explanation / Answer

A.1

1. An electron and a positron meet and turn into a Z-boson which then turns into another electron/positron pair
2. An up quark and an anti-up quark meet and turn into a Z-boson which then turns into a muon and anti-muon pair
5. An electron and a positron meet and turn into a Z-boson which then turns into a muon and anti-muon pair

A.2 Fundamental particles are,

1. A supersymmetric electron
3. A supersymmetric anti-quark
4. A supersymmetric quark
5. A supersymmetric photon
6. A supersymmetric positron

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