Which of the following are examples of interactions that wou

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

Solution

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