Question
When a π−\pi^- decays, the products may include:
  1. A positron
  2. A muon
  3. A proton
  4. All of the above
Question by OpenStax is licensed under CC BY 4.0
Final Answer

(b)

Solution video

OpenStax College Physics for AP® Courses, Chapter 33, Problem 15 (Test Prep for AP® Courses)

OpenStax College Physics, Chapter 33, Problem 15 (AP) video thumbnail

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Video Transcript
This is College Physics Answers with Shaun Dychko. When a negative pion decays, the products have to include something that has a negative charge in order for charge conservation to apply and charge conservation is one of these strong conservation or exact conservation rules; exact meaning there are no exceptions to it. So if this negative thing decays, it has to produce a negative thing and so that means a muon, which is negatively charged could be one of the products.