Higher dimensional seesaw Atsushi WATANABE Niigata Univ. & The Max-Planck-Institute for Nuclear Physics 23 rd February HRI, Allahabad Based on the.

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Presentation transcript:

Higher dimensional seesaw Atsushi WATANABE Niigata Univ. & The Max-Planck-Institute for Nuclear Physics 23 rd February HRI, Allahabad Based on the work with K. Yoshioka (Kyoto Univ.), H. Ishimori, Y. Shimizu, M. Tanimoto (Niigata Univ.)

Contents The interplay between neutrino physics and the extra dimensions The bulk right-handed neutrinos KK expansion and the propagator Flavor symmetry breaking on orbifolds

The bulk right-handed neutrinos SM gravity right-handed neutrinos [Dienes,Dudas,Gherghetta,1999] [Arkani-Hamed,Dimopoulos,Dvali,March-Russell,1999] Standard Model + Dirac Yukawa An interesting range of the neutrino mass shows up Suppressed Dirac mass Neutrino mass

Localizationof the wave function Localization of the wave function [Grossman, Neubert, 99] (SM) Dirac (kink) mass in the S1/Z2 bulkZero mode function [Chang, Hisano, Nakano, Okada, Yamaguchi, 99]

Seesaw in five dimensions [Dienes,Dudas,Gherghetta,99] [Lukas, Ramond, Romanino, Ross, 00] Neutrino mass after the seesaw

Options available in 5D ■ The mass terms (Majorana, Dirac, Lorentz-violating …) ■ The bulk geometry (Flat, Warped, Others …) ■ The boundary conditions for the bulk fields

Seesaw with the bulk Dirac mass [AW, Yoshioka, 2009] for eV neutrino mass Bulk Dirac The neutrino mass becomes

Inverse seesaw small The zero mode function Zero mode is negligible in seesaw Whole neutrino mass matrix

On the warped geometry Randall-Sumdrum background Planck (y=0)TeV (y=L) How does the background change the neutrino mass ?

By the usual KK expansion, … It is hard to perform seesaw diagonalization

The equations for the bulk propagator the warped effect is vanishing away at the low-energy limit Alternative to the KK expansion ⇒ 5D propagator

The result is ・ The neutrino mass is not much affected by the background ・ The result is the same for more general metric ・ The seesaw mass can be calculated without knowing the KK expansion Even with a complicated backgroud where a suitable KK expansion cannot be find, the seesaw neutrino mass is calculable.

Flavor symmetry breaking at the boundaries S 4 group Irreducible representations: Exmaple of the triplet S 4 breaking boundary conditions elements of the S4 group

Lagrangian of neutrino sector 4D Lagrangian is obtained by

Example I: KK expansionMajorana mass matrix after the seesaw ・ only one mixing angle ・ degenerate masses

Example II: The result is

3 effective parameters: Deviation from the tri-bimaximal mixing

Summary We have explored ``bulk seesaw” ・ Inverse seesaw (bulk Dirac mass) ・ Geometry free nature of the neutrino mass ・ Flavor symmetry breaking at the boundaries

Charged-lepton sector For Example ⇒ small mixing for the left-handed direction