{"arxiv_id":"hep-ph/0308276","title":"Primordial Lepton Family Asymmtries in Seesaw Model","abstract":"In leptogenesis scenario, the decays of heavy Majorana neutrinos generate lepton family asymmetries, $Y_e, Y_{\\mu}$ and $Y_{\\tau}$. They are sensitive to CP violating phases in seesaw models. The time evolution of the lepton family asymmetries are derived by solving Boltzmann equations. By taking a minimal seesaw model, we show how each family asymmetry varies with a CP violating phase. For instance, we find the case that the lepton asymmetry is dominated by $Y_{\\mu}$ or $Y_{\\tau}$ depending on the choice of the CP violating phase. We also find the case that the signs of lepton family asymmetries $Y_{\\mu}$ and $Y_{\\tau}$ are opposite each other. Their absolute values can be larger than the total lepton asymmetry and the baryon asymmetry may result from the cancellation of the lepton family asymmetries.","primary_cat":"hep-ph","cross_cats":[],"submitted_at":"2003-08-27T12:53:47+00:00","latest_version":1,"source":"arxiv","source_label":"arXiv","source_url":null,"has_pdf":true,"has_source":false,"verdict":"CONDITIONAL","confidence":"MODERATE","one_line_summary":"In a minimal seesaw model, the muon and tau lepton asymmetries can each reach order 10^-8 and cancel to leave a total lepton asymmetry of order 10^-10, with the dominant family set by a single CP-violating phase.","novelty_score":6.0,"correctness_risk":"medium","formal_verification":"none","upvotes":0,"downvotes":0,"pith_score":0,"inbound_count":26,"_links":{"html":"https://pith.science/paper/hep-ph/0308276","verdict":"/api/v1/verdicts/hep-ph/0308276"}}