In Addition to Charge and Baryon Number, Another Conserved Quantity

question 3

Multiple Choice

In addition to charge and baryon number, another conserved quantity in particle interactions is lepton number. The six leptons have lepton number +1, and their antiparticles have lepton number −1. The lepton numbers for each generation (electron, muon, tau) are separately conserved. For example, an electron has electron-lepton number +1, while the electron antineutrino has electron-lepton number −1. What is the missing particle X in the following reaction? μ⁻+ p → n + X

• A) e⁻
• B) π⁰
• C) v_e
• D) v_μ
• E) γ

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