TY - JOUR
T1 - Enlarging the window for radiative leptogenesis
AU - Branco, G. C.
AU - González Felipe, R.
AU - Joaquim, F. R.
AU - Nobre, B. M.
N1 - Funding Information:
We are grateful to Pasquale Di Bari for useful comments and enlightening discussions. F.R.J. thanks Andrea Brignole and Ferruccio Feruglio for useful discussions and CFTP (IST, Lisbon) for its kind hospitality during the final stage of this work. This work was supported by Fundação para a Ciência e a Tecnologia (FCT, Portugal) through the projects POCTI/FNU/44409/2002 and PDCT/FP/FNU/50250/2003. R.G.F. and F.R.J. have been supported by FCT under the grants SFRH/BPD/1549/2000 and SFRH/BPD/14473/2003, respectively. B.M.N. is supported by a fellowship from CFTP and the FCT grant SFRH/BD/995/2000.
Copyright:
Copyright 2006 Elsevier B.V., All rights reserved.
PY - 2006/2/9
Y1 - 2006/2/9
N2 - We investigate the scenario of resonant thermal leptogenesis, in which the leptonic asymmetries are generated through renormalization group corrections induced at the leptogenesis scale. In the framework of the standard model extended by three heavy Majorana neutrinos with masses M1 = M 2 ≪ M3 at some high scale, we show that the mass splitting and CP-violating effects induced by renormalization group corrections can lead to values of the CP asymmetries large enough for a successful leptogenesis. In this scenario, the low-energy neutrino oscillation data can also be easily accommodated. The possibility of having an underlying symmetry behind the degeneracy in the right-handed neutrino mass spectrum is also discussed.
AB - We investigate the scenario of resonant thermal leptogenesis, in which the leptonic asymmetries are generated through renormalization group corrections induced at the leptogenesis scale. In the framework of the standard model extended by three heavy Majorana neutrinos with masses M1 = M 2 ≪ M3 at some high scale, we show that the mass splitting and CP-violating effects induced by renormalization group corrections can lead to values of the CP asymmetries large enough for a successful leptogenesis. In this scenario, the low-energy neutrino oscillation data can also be easily accommodated. The possibility of having an underlying symmetry behind the degeneracy in the right-handed neutrino mass spectrum is also discussed.
UR - http://www.scopus.com/inward/record.url?scp=30944441625&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2005.11.070
DO - 10.1016/j.physletb.2005.11.070
M3 - Article
AN - SCOPUS:30944441625
SN - 0370-2693
VL - 633
SP - 336
EP - 344
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 2-3
ER -