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A comment on Particle seen switching between matter and antimatter at CERN. Parent comment

Re:Particle seen switching between matter and antimatter at ... by ganzuul on Saturday June 12, 2021 @04:21PM (#27487184)
Charm, Up and Top are all different. They share some properties but not all and therefore annihilation can not take place.
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Re:Particle seen switching between matter and antimatter at ... by dukwon on Saturday June 12, 2021 @04:27PM (#27487213)
Sure it can, but it has to proceed via the weak interaction, and it's suppressed by the GIM mechanism. For example, D⁰→γγ (c̅u or cu̅ annihilation) is rare and not yet observed, but it's allowed.
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