Feynman Diagrams - a beginners guide

An introduction to the "rules" of drawing and understanding the diagrams

Category:

Education

Tags:

• Richard
• Feynman
• boson
• electron
• proton
• neutron
• positron
• lepton
• physics
• Alevel
• ASlevel
• transformation
• interaction
• science

[dandunleavy]

South Shields/Cleadon/Jesmond now Dallas/Regent's Park depending on spin.

[fizzicsorg]

Nice thought, unfortunately reality is much more mundane.

[dandunleavy]

Geordies get everywhere!

[fizzicsorg]

Well spotted, dead right

[bphysicsguy]

An interesting point about the diagram at 4:43. If the boson is drawn with a positive slope, it is a W-. Drawn with a negative slope it is a W+. Its easier to keep track of the charge if you chose one or the other, but they are actually describing exactly the same reaction.

[fizzicsorg]

A good point. There is no generally agreed convention on the legends which are used, however that would be a useful addition.

[adaseth]

Nice ruler :)

[quantiseduniverse]

Great!

A slight typo at 3:18... 'up' quark should remain 'up'.

[mattb521]

I think representing time on the x-axis and space on the y-axis to be exceedingly more intuitive for many reasons

[warnford]

emission seems mis-spelt throughout

I s'pose if the site is called fizzicz, then no one is likely to notice

[lennythelabrat]

I think baryon number is conserved for electron capture rather than boson number.

[lblmer]

What a crock of bull. The atomic theory is bunk. Protons held strongly together by GLUONS? Stop promoting this false concept. I guess Feynman was wrong. There are 5 fundamental forces. Do something useful for mankind. Get a shovel an dig a ditch.

[PhysicsMathMan]

@jimbopumbapigsticks fermions are a family of particles that obey fermi-dirac statistics. Opposed to this are bosons which obey bose-einstein statistics. I'd wiki both, but do not worry about understanding it too much -- I work on this stuff for a living and don't understand them fully to this day.

[seyoumeye]

This is well explained...but what surprises me is that "we" are still looking at these particles as if we are not made out them (consciousness is real!).

[j050227]

I don't get it and his accent annoys me like no other

[nachoseg]

wtf

[snevets123]

Has anyone got the time?

[phara0h1]

@jimbopumbapigsticks Fermions are generally considered to be particles associated with matter, ie the quarks and leptons, as opposed to bosons which are force carrier particles.

Search the wiki article if you want a more accurate description.