PHY106Electric Force

PHY106Electric Force - The Standard Model of Particle...

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Unformatted text preview: The Standard Model of Particle Physics EM STRONG WEAK The Electric Force In the old days, we believed that “force” was transmitted more or less instantaneously by a “field of force”. P Lines of force Lines of force p p p p The proton to the right is repelled by the “electric field” created by the one on the left (electrical repulsion). The New Concept of Force In the 1960’s, a new theory of interactions was developed. At the heart of it is the concept that: Forces are the result of the exchange of “force carriers ” between the two particles involved in the interaction. Forces are the result of the exchange of “ force carriers ” between the two particles involved in the interaction. The force carrier of the electromagnetic force is the photon ( γ ) The force carrier of the electromagnetic force is the photon ( γ ) Richard Feynman, 1918-1988 1965 Nobel Prize in Physics The Photon ( γ ) Property Value Mass Charge The photon is the “mediator” of the electromagnetic interaction The photon can only interact with objects which have electric charge The photon is the “mediator” of the electromagnetic interaction The photon can only interact with objects which have electric charge As we go through these slides, note that all particles involved (other than the photon) carry electrical charge ! Electromagnetic Interaction (I) e + e- e + e- e + e- e- e + e + + e- e + + e- (Annihilation) γ γ e + e- e + e- e + e- e- e + Electromagnetic Interaction (I) e + e- e + e- e + e- e- e + e + + e- e + + e- (Annihilation) γ γ e + e- e + e- e + e- e- e + Electromagnetic Interaction (II) e + e- e + e- e + e- e + e- e + e- e + e- e- e + e + + e- e + + e- (Compton Scattering) Electromagnetic Interaction (II) e + e- e + e- e + e- e + e- e + e- e- e + e + + e- e + + e- (Compton Scattering) e- Electron-Pair Production γ e + + e- (or “ γ Conversion”) γ γ γ γ γ e + e- e + e- e + e- e- e + Electron-Pair Production γ e + + e- (or “ γ Conversion”) γ γ γ γ γ e + e- e + e- e + e- e- e + Quark Pair Production...
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PHY106Electric Force - The Standard Model of Particle...

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