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This is obviously a duplicate of If matter and antimatter... However, it's now four to five years after a swarm of videos were made on this subject. At the time, there was a consensus that the LHC would soon be able to tell us if there's some asymmetry that might explain why matter and antimatter didn't completely annihilate each other in the first few seconds of BBN.

So what is the current state of this issue? Is there any theory that can explain how a photon could split into unequal parts of matter and antimatter? How big a problem is this?

Qmechanic
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Here is a solution which would be matching quantitatively (in contrast to all current solutions):

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A split big bang with two opposite time directions. Creation of matter and antimatter at the moment $t0$, but also at the moment $-t0$. Matter and antimatter are separated by the propagation of matter and antimatter in two opposite time directions.

This proposal is no ready-made theory, and it would leave many open questions, but it shows that quantitative solutions are possible and that perhaps not all resources have been explored yet in physics.

Moonraker
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