Insensitivity of Leptogenesis with Flavor Effects to Low Energy Leptonic $CP$ Violation

Insensitivity of Leptogenesis with Flavor Effects to Low Energy Leptonic $C P$ Violation

Sacha Davidson, Julia Garayoa, Federica Palorini, and Nuria Rius

Phys. Rev. Lett. 99, 161801 – Published 18 October 2007

Abstract

If the baryon asymmetry of the Universe is produced by leptogenesis, $C P$ 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.

Received 22 May 2007

DOI:https://doi.org/10.1103/PhysRevLett.99.161801

Authors & Affiliations

Sacha Davidson^1,*, Julia Garayoa^2,†, Federica Palorini^1,‡, and Nuria Rius^2,§

¹IPN de Lyon, Université Lyon 1, CNRS, 4 rue Enrico Fermi, Villeurbanne, 69622 cedex, France
²Departamento de Física Teórica and IFIC, Universidad de Valencia-CSIC, Valencia, Spain

^*s.davidson@ipnl.in2p3.fr
^†julia.garayoa@ific.uv.es
^‡f.palorini@ipnl.in2p3.fr
^§nuria.rius@ific.uv.es

Article Text (Subscription Required)

Click to Expand

References (Subscription Required)

Click to Expand

Issue

Vol. 99, Iss. 16 — 19 October 2007

Reuse & Permissions

Access Options

Author publication services for translation and copyediting assistance advertisement

Physical Review Letters