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When a $\pi^-$ decays, the products may include:
  1. A positron
  2. A muon
  3. A proton
  4. All of the above
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OpenStax College Physics Solution, Chapter 33, Problem 15 (Test Prep for AP® Courses) (0:36)

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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.