Physics Lecture 24 - Lecture 24 Forces and Interactions...

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Lecture 24: Forces and Interactions Part II I. Reaction Diagrams A. Includes everything 1. particles 2. charges 3. messengers B. Concept Test 1. Which of the following is a valid expression for the reaction Δ− + e + → n e in terms of quarks? i. No combination because leptons do not have quarks C. Approach to Interaction Diagrams 1. convert all hadrons to quarks 2. write down reactants at bottom, products at top. Write things in convenient order i. keep same order as much as possible. a. If uud on bottom and udd on top, write udu on bottom and udd on top ii. Annihilation 3. add colors 4. connect the quarks or leptons that do not do anything 5. everything else D. Example 1. Δ - + e + n + υbar e 2. ddd + e + udd + υbar e 3. n Rd Gd Bu υbar e Rd Gd Bd e + Δ - E. Example 1. Δ + n + π + 2. uud udd + udbar 3. n π + Ru Gd Bd Gbar-dbar Gu Ru Gd Bu Δ + W + BGbar-gl
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II. Decay Processes A. What can a particle decay into? 1. Has to be products whose total mass is less than the original particle. Ignore everything below that particle on the table
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