P 1,2 > Leptons > Flashcards

Leptons Flashcards

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1
Q

What are leptons?

A

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

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2
Q

How do leptons interact?

A
  • Weak interaction
  • Gravitational Interaction
  • Electromagnetic Interaction, if they are charged.
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3
Q

How do leptons interact with other particles?

A

Via weak interaction

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4
Q

What are the different leptons?

A
  • Muon

* Electron

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5
Q

What do Muons decay into?

A

Ordinary electrons.

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6
Q

What are the two types of neutrino for leptons?

A
  • Muon-neutrino

* Electron-neutrino

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7
Q

What are neutrinos?

A

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

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8
Q

How do leptons become other leptons?

A

Through weak interaction.

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9
Q

How are leptons produced/annihilated?

A

Particle-antiparticle interactions

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10
Q

What is the lepton number?

A
  • 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.
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11
Q

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

A
  • 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.
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12
Q

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

A

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.

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13
Q

What is a rule for all lepton interactions?

A

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

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14
Q

What is the lepton number for anti-leptons?

A

-1

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15
Q

What is the lepton number for leptons?

A

+1

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16
Q

What is the lepton number for non leptons?

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