PHY106Interactions decays and conservation laws

PHY106Interactions decays and conservation laws - The...

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Unformatted text preview: The Standard Model of Particle Physics EM STRONG WEAK Interactions and Decays Forces are responsible for: Interactions Decays Decays are really a type of interaction though… What do I mean by an Interaction? 1 2 1 2 1 2 2 1 B A M 4 3 4 3 4 3 3 4 1 + 2 3 + 4 What do I mean by a Decay ? 1 3 + 4 1 1 1 1 B A M 4 3 4 3 4 3 3 4 Conservation Laws Conservation Laws , or alternately, conserved quantities , allow you to place constraints on what types of interactions and decays can or cannot occur. Conservation Laws , or alternately, conserved quantities , allow you to place constraints on what types of interactions and decays can or cannot occur . Conserved Quantities By conserved , we simply mean that the value on the left hand side must equal the value on the right hand side. Consider the process where two particles A and B collide, and produce particles C and D: A + B C + D Some of the most important examples are: Total energy is ALWAYS conserved – energy cannot be created nor destroyed, only transformed Total momentum is ALWAYS conserved Total charge is ALWAYS conserved- cannot simply create net charge Some of the most important examples are: Total energy is ALWAYS conserved – energy cannot be created nor destroyed, only transformed Total momentum is ALWAYS conserved Total charge is ALWAYS conserved- cannot simply create net charge Energy Conservation (I) A + B C + D Energy conservation means: Energy of particle “A” + Energy of particle “B” = Energy of particle “C” + Energy of particle “D” E A + E B = E C + E D Or, in simpler notation, If you knew any 3 of the energies, you could compute the fourth!...
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PHY106Interactions decays and conservation laws - The...

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