# Why is it so important to measure CP violation in the lepton sector?

CP violation has been measured in the hadronic sector (K-mesons, B-mesons) and these baryons can decay into leptons, so why is it so important to measure direct CP violation into the lepton sector? I could naively think that we have e.g. too many protons in the universe due to CP violation and then there are too many $K^-$ that decay into electrons (and antineutrinos, what is the ratio between antineutrinos and neutrinos in the universe?) and there you have our universe. I know there has to be a "quantitative" reason to make the search for CP violation in the lepton sector so significant, but I just cannot find it.

• Possibly Leptogenesis? Sep 18 '18 at 19:03