AI Article Synopsis
- The text discusses the concept of baryon asymmetry in the Universe and its relationship to leptogenesis, stressing the necessity of CP violation in the lepton sector.
- It highlights that when modeling this using the seesaw mechanism with three right-handed neutrinos, the baryon asymmetry remains unaffected by certain observable phases known as Pontecorvo-Maki-Nakagawa-Sakata phases.
- The authors confirm that this insensitivity persists even when considering flavor effects in the leptogenesis process.
Article Abstract
If the baryon asymmetry of the Universe is produced by leptogenesis, CP violation is required in the lepton sector. In the seesaw extension of the standard model with three hierarchical right-handed neutrinos, we show that the baryon asymmetry is insensitive to the Pontecorvo-Maki-Nagakawa-Sakata phases: thermal leptogenesis can work for any value of the observable phases. This result was well known when there were no flavor effects in leptogenesis; we show that it remains true when flavor effects are included.
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| http://dx.doi.org/10.1103/PhysRevLett.99.161801 | DOI Listing |
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