[ExI] Why is there more matter than antimatter?

[John Clark]

Why is there more matter than antimatter when the properties of the 2
things seem symmetrical? Back in 1964 a particle called the "kaon" was
discover that showed the symmetry between the two was not quite perfect and
slightly favored matter over antimatter, but kaons are rare and that effect
was much too slight to explain why the Big Bang didn't annihilate nearly
all the matter in the universe. But now in today's issue of the journal
Nature indications of a far larger discrepancy was found between neutrinos
and antineutrinos, and matter is winning. More muon neutrinos are
oscillating into electron neutrinos than muon antineutrinos are oscillating
into electron antineutrinos. The evadens is only 3 sigma so there is still
one chance in a thousand it's just a statistical fluke and 5 sigma (one in
a million) is required to officially claim a discovery but it's still a
pretty big deal.

Constraint on the matter–antimatter symmetry-violating phase in neutrino
oscillations <https://www.nature.com/articles/s41586-020-2177-0>

John K Clark
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