Open Access
Issue
EPL
Volume 88, Number 5, December 2009
Article Number 51001
Number of page(s) 6
Section The Physics of Elementary Particles and Fields
DOI http://dx.doi.org/10.1209/0295-5075/88/51001
Published online 09 December 2009
EPL, 88 (2009) 51001
DOI: 10.1209/0295-5075/88/51001

Non-unitary lepton mixing matrix, leptogenesis and low-energy CP violation

W. Rodejohann

Max-Planck-Institut für Kernphysik - Postfach 103980, D-69029 Heidelberg, Germany, EU

werner.rodejohann@mpi-hd.mpg.de

received 17 July 2009; accepted in final form 10 November 2009; published December 2009
published online 9 December 2009

Abstract
It is well known that for unflavored leptogenesis there is in general no connection between low- and high-energy CP violation. We stress that for a non-unitary lepton mixing matrix this may not be the case. We give an illustrative example for this connection and show that the non-standard CP phases that are induced by non-unitarity can be responsible for observable effects in neutrino oscillation experiments as well as for the generation of the baryon asymmetry of the Universe. Lepton flavor violation in decays such as $\tau \rightarrow \mu \gamma $ can also be induced at an observable level. We also comment on the neutrino mass limits from leptogenesis, which get barely modified in case of a non-unitary mixing matrix.

PACS
14.60.Pq - Neutrino mass and mixing.
14.60.St - Non-standard-model neutrinos, right-handed neutrinos, etc.

© EPLA 2009