From forming bound states to normal scattering, many possibilities abound for matter-antimatter interactions. So why do they annihilate? There’s a quantum reason we simply can’t avoid.
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I don’t see that the article actually answers the question. It mostly talks about what happens if/when particles and antiparticles interact, not why annihilation happens.
I’m a smoothbrain, so I like to think about it as them simply canceling each other out. What I’m more curious about though, is why there’s so much matter compared to antimatter.