We analyse, within the "flavoured" leptogenesis scenario of baryon asymmetry generation, the interplay of "low energy" CP-violation, originating from the PMNS neutrino mixing matrix U, and "high energy" CP-violation, which can be present in the matrix of neutrino Yukawa couplings, lambda, and can manifest itself only in "high" energy scale processes. The type I see-saw model with three heavy right-handed Majorana neutrinos having a hierarchical spectrum is considered. The "orthogonal" parameterisation of the matrix of neutrino Yukawa couplings, which involves a complex orthogonal matrix R, is employed. In this approach the matrix R is the source of "high energy" CP-violation. Results for normal hierarchical (NH) and inverted hierarchical (IH) light neutrino mass spectrum are derived in the case of decoupling of the heaviest right-handed Majorana neutrino. It is shown that taking into account the contribution to Y (B) due to the CP-violating phases in the neutrino mixing matrix U can change drastically the predictions for Y (B) , obtained assuming that only "high energy" CP-violation from the R-matrix is operative in leptogenesis. In the case of the IH spectrum, in particular, there exist significant regions in the corresponding parameter space where the purely "high energy" contribution in Y (B) plays a subdominant role in the production of baryon asymmetry compatible with the observations.

The interplay between "low" and "high" energy CP-violation in leptogenesis / Molinaro, E; Petcov, St. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 61:1(2009), pp. 93-109. [10.1140/epjc/s10052-009-0985-3]

The interplay between "low" and "high" energy CP-violation in leptogenesis

Petcov, ST
2009-01-01

Abstract

We analyse, within the "flavoured" leptogenesis scenario of baryon asymmetry generation, the interplay of "low energy" CP-violation, originating from the PMNS neutrino mixing matrix U, and "high energy" CP-violation, which can be present in the matrix of neutrino Yukawa couplings, lambda, and can manifest itself only in "high" energy scale processes. The type I see-saw model with three heavy right-handed Majorana neutrinos having a hierarchical spectrum is considered. The "orthogonal" parameterisation of the matrix of neutrino Yukawa couplings, which involves a complex orthogonal matrix R, is employed. In this approach the matrix R is the source of "high energy" CP-violation. Results for normal hierarchical (NH) and inverted hierarchical (IH) light neutrino mass spectrum are derived in the case of decoupling of the heaviest right-handed Majorana neutrino. It is shown that taking into account the contribution to Y (B) due to the CP-violating phases in the neutrino mixing matrix U can change drastically the predictions for Y (B) , obtained assuming that only "high energy" CP-violation from the R-matrix is operative in leptogenesis. In the case of the IH spectrum, in particular, there exist significant regions in the corresponding parameter space where the purely "high energy" contribution in Y (B) plays a subdominant role in the production of baryon asymmetry compatible with the observations.
2009
61
1
93
109
https://doi.org/10.1140/epjc/s10052-009-0985-3
https://arxiv.org/abs/0803.4120
Molinaro, E; Petcov, St
File in questo prodotto:
File Dimensione Formato  
EurPhysJC(2009)6193109.pdf

non disponibili

Tipologia: Versione Editoriale (PDF)
Licenza: Non specificato
Dimensione 658.1 kB
Formato Adobe PDF
658.1 kB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11767/13871
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 45
  • ???jsp.display-item.citation.isi??? 41
social impact