TY - JOUR
T1 - Leptonic CP violation phases using an ansatz for the neutrino mass matrix and application to leptogenesis
AU - Nasri, Salah
AU - Schechter, Joseph
AU - Moussa, Sherif
N1 - Funding Information:
It is a pleasure to thank Deirdre Black, Amir Fariborz, Cosmin Macesanu, Mark Trodden, and David Schechter for their kind help with various aspects of this work. ?>We would like to thank Samina Masood for check?>ing part of Table 1. The work of S. N. is supported ?>by National Science foundation Grant No. PHY-0099544. The work of J. S. is supported in part by ?>the U. S. DOE under Contract No. DE-FG-02-85ER 40231.
PY - 2004/9
Y1 - 2004/9
N2 - We further study the previously proposed ansatz, Tr(Mν) = 0, for a prediagonal light Majorana type neutrino mass matrix. If CP violation is neglected this enables one to use the existing data on squared mass differences to estimate (up to a discrete ambiguity) the neutrino masses themselves. If it is assumed that only the conventional CP phase is present, the ansatz enables us to estimate this phase in addition to all three masses. If it is assumed that only the two Majorana CP phases are present, the ansatz enables us to present a one parameter family of solutions for the masses and phases. This enables us to obtain a simple "global" view of lepton number violation effects. Furthermore using an SO(10) motivation for the ansatz suggests an amusing toy (clone) model in which the heavy neutrinos have the same mixing pattern and mass ratios as the light ones. In this case only their overall mass scale is not known (although it is constrained by the initial motivation). Using this toy model we make a rough estimate of the magnitude of the baryon to photon ratio induced by the leptogenesis mechanism. Solutions close to the CP conserving cases seem to be favored.
AB - We further study the previously proposed ansatz, Tr(Mν) = 0, for a prediagonal light Majorana type neutrino mass matrix. If CP violation is neglected this enables one to use the existing data on squared mass differences to estimate (up to a discrete ambiguity) the neutrino masses themselves. If it is assumed that only the conventional CP phase is present, the ansatz enables us to estimate this phase in addition to all three masses. If it is assumed that only the two Majorana CP phases are present, the ansatz enables us to present a one parameter family of solutions for the masses and phases. This enables us to obtain a simple "global" view of lepton number violation effects. Furthermore using an SO(10) motivation for the ansatz suggests an amusing toy (clone) model in which the heavy neutrinos have the same mixing pattern and mass ratios as the light ones. In this case only their overall mass scale is not known (although it is constrained by the initial motivation). Using this toy model we make a rough estimate of the magnitude of the baryon to photon ratio induced by the leptogenesis mechanism. Solutions close to the CP conserving cases seem to be favored.
UR - https://www.scopus.com/pages/publications/84927759514
UR - https://www.scopus.com/pages/publications/84927759514#tab=citedBy
U2 - 10.1103/PhysRevD.70.053005
DO - 10.1103/PhysRevD.70.053005
M3 - Article
AN - SCOPUS:84927759514
SN - 0556-2821
VL - 70
SP - 053005-1-053005-13
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 5
M1 - 053005
ER -