# Physics- Unit 1- Quarks and Leptons

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• Created by: FireDwarf
• Created on: 23-11-13 11:59
How do we call particals?
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A partical or antiparticle that interacts through the strong interaction and through the electromagnetic interaction if charged. They all, except protons, decay through weak interactions.
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What is a lepton?
Partical or antipartical that interacts through weak interactions and through electromagnetic interaction if charged.
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How do we further classify hadrons?
Baryons and Mesons
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Baryon?
all hadrons that break down into protons, indirect or directly. (Protons,neutrons)
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Mesons?
Dont break down into protons (K meson and pie mesons)
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examples of leptons?
Electrons, neutrions, muons
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How does the large Hadron Collider work?
Ring shaped accelrator that boots kinetic energy of charged particals in a ring. Magnets bend these particals to keep them in the ring. They then collide with other particals.
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What happens to their energy when they collide?
The products have the total energy previous - the kinetic energy of the products.
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What happens to their energy before they collide?
Before they collide they have their rest energy + kinetic energy.
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What is conserved?
Their charge., lepton number, baryon number,, strangness if in a strong interaction, energy
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What is strangeness?
An explanation for why certian particles were created easilly in a particle collision but decayed much more slowly then expected
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Therefore, what is strangeness?
A value which describes decay in strong and electromagnetic interactions.
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What are quarks and antiquarks?
Properties of hadrons can be explained by assuming they are composted of smaller fundermental particles, quarks and antiquarks. There are 3 diffrent types of quarks.
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What are the 3 types of quarks?
up,down,strange.
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What do Mesons consist of?
A quark and an anti-quark.
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What is special about pie meson?
Can be any corosponding quark & antiquark pair.
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Proton quark?
uud
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Neutron quark?
udd
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Quark and antiquark decay for B-?
Neutron to proton for B- and therefore we get a d to u.
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## Other cards in this set

### Card 2

#### Back

A partical or antiparticle that interacts through the strong interaction and through the electromagnetic interaction if charged. They all, except protons, decay through weak interactions.

### Card 3

#### Front

What is a lepton?

### Card 4

#### Front

How do we further classify hadrons?

Baryon?