Tri-bimaximal Neutrino Mixing and Flavor-dependent Resonant Leptogenesis

TeV and their masses are highly degenerate. Its novel Yukawa-coupling texture together with the seesaw mechanism allows us to achieve the normal neutrino mass hierarchy with

m^{}_1 = 0

and a nearly tri-bimaximal neutrino mixing pattern with the maximal CP-violating phase:

\theta^{}_{23} = \pi/4

,

|\delta| = \pi/2

and

\sin^2 \theta^{}_{12} = (1 - 2 \tan^2 \theta^{}_{13})/3

. One may also obtain the inverted neutrino mass hierarchy with

m^{}_3 = 0

and the corresponding neutrino mixing pattern with

\theta^{}_{23} =\pi/4

and

\theta^{}_{13} = \delta = 0

. In both cases, the cosmological baryon number asymmetry

\eta^{}_{\rm B} \approx 6.1 \times 10^{-10}

can naturally be interpreted through the resonant leptogenesis mechanism. After taking into account the flavor effects, we find that the prediction for

\eta^{}_{\rm B}

is enhanced by a factor

\sim 4

. An experimental test of this TeV-scale neutrino model might be possible at LHC and ILC in the future.

11.30.Fs
14.60.Pq
14.60.St
neutrino: mass
neutrino: mixing angle
seesaw model: minimal
mass: hierarchy
matter: asymmetry
leptogenesis
baryon number: asymmetry

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