The University of Southampton
University of Southampton Institutional Repository

Flavour effects on leptogenesis predictions

Di Bari, Pasquale and Blanchet, Steve (2007) Flavour effects on leptogenesis predictions Journal of Cosmology and Astroparticle Physics, 2007 (doi:10.1088/1475-7516/2007/03/018).

Record type: Article


We show that flavour effects in leptogenesis reduce the region of the seesaw parameter space where the final predictions do not depend on the initial conditions, the strong wash-out regime. In this case the lowest bounds holding on the lightest right-handed (RH) neutrino mass and on the reheating temperature for hierarchical heavy neutrinos do not get relaxed compared to the usual ones in the one-flavour approximation, M_1 (T_{\mathrm {reh}})\gtrsim 3\,(1.5)\times 10^{9} GeV. Flavour effects can however relax down to these minimal values the lower bounds holding for fixed large values of the decay parameter K1. We discuss a relevant definite example showing that, when the known information on the neutrino mixing matrix is employed, the lower bounds for K_1\gg 10 are relaxed by a factor 2–3 for fully hierarchical light neutrinos, without any dependence on ?13 and on possible phases. On the other hand, going beyond the limit of hierarchical light neutrinos and taking into account Majorana phases, the lower bounds can be relaxed by one order of magnitude. Therefore, Majorana phases can play an important role in leptogenesis when flavour effects are included.

PDF 1475-7516_2007_03_018.pdf - Version of Record
Restricted to Repository staff only
Download (1MB)

More information

Published date: 21 March 2007


Local EPrints ID: 152699
ISSN: 1475-7508
PURE UUID: 96f78c7b-ef52-43a7-b60f-646570fb20ce

Catalogue record

Date deposited: 03 Jun 2010 09:14
Last modified: 18 Jul 2017 12:53

Export record



Author: Pasquale Di Bari
Author: Steve Blanchet

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton:

ePrints Soton supports OAI 2.0 with a base URL of

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.