1283_Physics ProblemsTechnical Physics

# 1283_Physics ProblemsTechnical Physics - 624 Particle...

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624 Particle Physics and Cosmology Section 46.4 Classification of Particles P46.10 In ? + + + + p n µ , charge conservation requires the unknown particle to be neutral. Baryon number conservation requires baryon number = 0. The muon-lepton number of ? must be –1. So the unknown particle must be ν µ . P46.11 Λ + + + 0 K K S 0 + + π π (or π π 0 0 + ) Λ 0 + + p π n p e e + + + ν Section 46.5 Conservation Laws P46.12 (a) p p e + + + µ L e 0 0 0 1 + + and L µ 0 0 1 0 + → − + (b) π π + + + p p charge + → + + 1 1 1 1 (c) p p p + + + π baryon number : 1 1 1 0 + + (d) p p p p n + + + baryon number : 1 1 1 1 1 + + + (e) γ π + + p n 0 charge 0 1 0 0 + + P46.13 (a) Baryon number and charge are conserved, with values of 0 1 0 1 + = + and 1 1 1 1 + = + in both reactions. (b) Strangeness is
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