"Size" of elemetary particles


by Vampyr
Tags: elemetary, particles, size
Vampyr
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#1
Aug21-13, 09:08 AM
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I stumbled upon this nice link showing the universe at different scales: http://htwins.net/scale2/

However, if you scroll down to the attometer scale you get to the elementary particles which have been given sizes. Does anyone know what these sizes mean? I thought elementary particles were dimensionless and so have no strict size.
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Drakkith
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Aug21-13, 09:18 AM
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I'd guess it either refers to something similar to a "classical electron radius" or it uses their wavefunction to determine the volume of space they are likely to occupy and base the size on that.
Bill_K
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#3
Aug21-13, 09:18 AM
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Quote Quote by Vampyr View Post
I stumbled upon this nice link showing the universe at different scales: http://htwins.net/scale2/ However, if you scroll down to the attometer scale you get to the elementary particles which have been given sizes. Does anyone know what these sizes mean? I thought elementary particles were dimensionless and so have no strict size.
You're correct. Apparently what he's diagramming here is the Compton wavelength for each particle, ħ/mc. Of the six quarks, the top quark has the greatest rest mass, hence the shortest Compton wavelength. Electron (classical) is the classical electron radius, e2/mc2.

Vampyr
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#4
Aug21-13, 03:31 PM
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"Size" of elemetary particles


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