We study a mechanism where tiny neutrino masses arise only from radiative contribution in a supersymmetric model. Without tuning the Higgs vev or Yukawa coupling, the tree-level light neutrino mass is rotated away by introducing a new singlet neutrino sL that forms a Dirac mass term with the right-handed neutrino nR in each generation. Even with the U(1)Lep lepton number violation term as non-zero right-handed Majorana neutrino mass MRnRc-nR, the lightest neutrino remains massless at tree level due to an approximate symmetry. Consequently, tiny neutrino masses then only arise from radiative contributions and the right-handed neutrino Majorana mass MR can be at O(keV) to give rise to the correct light neutrino mass at O(eV). Supersymmetry ensures that the Majorana neutrino masses MRnRc-nR and MR-sLc-sL are not generated simultaneously.
|Number of pages||4|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2011 Jun 27|
Bibliographical noteFunding Information:
We would like to thank T. Yanagida for discussions and comments on this project and early collaboration on a previous related project  . K.W. would also like to thank Jason Evans, Ming-xing Luo and Serguey Petcov for useful discussion. The work is supported by the World Premier International Research Center Initiative (WPI Initiative) , MEXT , Japan. S.C.P. and K.W. are also supported in part by the JSPS Grant-in-Aid for scientific research (Young Scientists) (B) 21740172 and (B) 22740143 respectively.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics