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Particles S# > Classification ( 2 ) > Flashcards

Classification ( 2 ) Flashcards

1
Q

What are the two groups of particles?

A
  • Hadrons

* Leptons

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2
Q

What are leptons?

A

Leptons are fundamental particles that do not feel strong nuclear force, they interact through the weak interaction, gravitational interaction, and the electromagnetic interaction if charged.

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3
Q

What are Hadrons?

A

Hadrons are particles that can interact through all four fundamental interactions, chiefly the strong interaction and through the electromagnetic interaction if charged.

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4
Q

How do hadrons decay?

A

Through the weak interaction

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5
Q

What is the only stable baryon?

A

Proton

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6
Q

What two groups make up hadrons?

A
  • Baryons

* Mesons

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7
Q

What are baryons?

A

Baryons are protons and all other hadrons that decay into protons, either directly or indirectly

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8
Q

What are mesons?

A

Mesons are hadrons that do not include protons in their decay products ( kaons and pions are not baryons ).

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9
Q

What particles make up hadrons?

A

Quarks and Anti Quarks.

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10
Q

What do baryons decay to?

A

A proton

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11
Q

What are the anti particles of baryons called?

A

Anti baryons

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12
Q

What is the baryon number?

A

Number of baryons in a particle

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13
Q

What is the baryon number of baryons?

A

+1

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14
Q

What is the baryon number of non baryons?

A

0

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15
Q

What is the baryon number of anti baryons?

A

-1

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16
Q

How is the total baryon number affected in an interaction?

A

The total baryon number in any particle interaction never .

17
Q

What is the baryon number of mesons?

A

0

18
Q

What are the lightest mesons?

A

Pions

19
Q

With which force do mesons interact with baryons?

A

Strong nuclear force.

20
Q

How do leptons interact with other particles?

A

Via the weak interaction

21
Q

How do electrons compare to muons?

A
  • Electrons are stable

* Muons, heavy electrons, are unstable and decay into electrons.

22
Q

What are the different neutrinos?

A
  • Electron Neutrino

* Muon Neutrino

23
Q

by which interaction can leptons change into other leptons?

A

Weak interaction

24
Q

What is a key feature of leptons?

A

They cannot break down into non leptons, they are fundamental.

25
Q

What is a key feature of lepton conservation?

A

Each lepton number must be counted separately, each different lepton has a lepton number of +1

26
Q

What occurs in muon decay?

A

A muon changes into a muon neutrino.

27
Q

Why are electrons & anti neutrinos created in muon decay?

A
  • Electron created to conserve charge

* Corresponding anti neutrino created to conserve lepton number.

28
Q

What is the lepton number for leptons?

A

+1

29
Q

What is the lepton number for anti leptons?

A

-1

30
Q

What is the lepton number for non leptons?

A

0

Particles S# (13 decks)

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