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Flashcards in Leptons Deck (16):
1

What are leptons?

• Fundamental Particles and antiparticles that do not interact through strong interaction ( they do not feel strong nuclear force ).

2

How do leptons interact?

• Weak interaction
• Gravitational Interaction
• Electromagnetic Interaction, if they are charged.

3

How do leptons interact with other particles?

Via weak interaction

4

What are the different leptons?

• Muon
• Electron

5

What do Muons decay into?

Ordinary electrons.

6

What are the two types of neutrino for leptons?

• Muon-neutrino
• Electron-neutrino

7

What are neutrinos?

Particles with zero or almost zero mass, and zero electric charge.

8

How do leptons become other leptons?

Through weak interaction.

9

How are leptons produced/annihilated?

Particle-antiparticle interactions

10

What is the lepton number?

• Number of leptons, each lepton has a number of +1.
• There are two types of lepton numbers, electron and muon.
• These different lepton numbers must be counted separately.

11

What happens in an interaction between a lepton and a Hadron?

• A neutrino or anti-neutrino can change into or from a corresponding charged lepton.
• An electron neutrino can therefore interact with a neutron to produce a proton and an electron.
• An electron neutrino and a neutron can not change into an anti-proton and a positron.

12

Why can an electron neutrino and a neutron not change into an anti-proton and a positron?

The lepton number is not conserved:
Ve + n > (anti)P + e+
Lepton number of +1 in the left, Lepton number of -1 on the right, no conservation.

13

What is a rule for all lepton interactions?

Both types of lepton number must be conserved in any change.

14

What is the lepton number for anti-leptons?

-1

15

What is the lepton number for leptons?

+1

16

What is the lepton number for non leptons?

0