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Particle Physics

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by

Michael Stewart

on 13 October 2013

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Transcript of Particle Physics

Particle Physics
Helpful Clips
4
Fundamental
Forces
Strong
Weak
Gravity
Electro-
magnetic
Gravitons
W & Z Bosons
Photons
Gluons
Force mediators
Collectively known as gauge bosons
These are emitted by particles constantly.
This forms a field
Range of field depends on the mass of the boson.
Two fields interacting can cause entanglement.
No Mass
Infinite range
Emitted whenever a charged particle accelerates
Only theoretical
Only found in hadrons
They have a property known as colour
Colours change when gluons exchanged
6 colours
Red, Green, Blue and antimatter versions
Any particles colour must add up to white
Red + Green + Blue
Red + anti-red
Mesons
Baryons
No Mass
Infinite range
Force particles
Neutrino Experiment
Causes β decay
Electrons or Positrons emitted
High mass
short range
Quark explanation
http://io9.com/5905629/what-are-quarks-and-why-do-they-have-colors-and-flavors
Useful links
12
Fundamental
Particles
Quarks
6 flavours
Interact through strong force
Flavour changed by weak force
Never observed on their own
Discovered by firing electrons at protons
(deep inelastic scattering experiment)
Theorized to explain combinations created in the 'particle zoo'
Property of colour used to bypass the exclusion principle
Leptons
Can change into other leptons through weak force.
6 flavours 3 generations/branches
Neutrinos have very few interactions
'Conservation of branch lepton number' rule
Fundamental particles

lepton = 1
anti-lepton = -1
non lepton = 0
Composite Particles
Hadrons
Baryons
Mesons
What is spin?
Property of matter
Intrinsic angular momentum
proof
Production of magnetic fields
Mini 'bar magnets'
problem
Cannot be considered to be actually moving
Would require more than light speed
½ integer spin
angular momentum = ½h
h=planck's constant
=6.62 × 10⁻³⁴ m² kg / s
Fermions
3 quarks or
3 antiquarks
Conservation of
baryon number
Larger baryons
decay into smaller
1 quarks +
1 antiquark
All coloured white
Quantum Chromo Dynamics
Red, Green, Blue
Colour
Anticolour
All very unstable
Bosons
Spin doctor??
Spin and it's effects
http://www.physicsoftheuniverse.com/topics_quantum_spin.html
Integer spin
What is it's effect?
½ integer spin
Can cancel out
Integer spin
Electrons pair with opposite spins
Can add up
Lasers
Pauli Exclusion principle
Conservation of strangeness -
Only strange and anti strange quarks have this.
Conserved in strong interactions but not in weak
'Conservation of baryon number' rule
baryon = 1
anti-baryon = -1
non baryon = 0
Full transcript