One-loop corrections to the seesaw mechanism in the multi-Higgs-doublet standard model

Jul, 2002
10 pages
Published in:
  • Phys.Lett.B 546 (2002) 86-95
e-Print:
Report number:
  • UWTHPH-2002-21

Citations per year

2003200820132018202302468
Abstract:
We consider the lepton sector of the Standard Model and allow for an arbitrary number of Higgs doublets and, moreover, for the presence of right-handed neutrino singlets which enable the seesaw mechanism. In this framework, we identify and calculate the dominant one-loop radiative corrections to the tree-level mass matrix of the light neutrinos. The interesting feature is that both the tree-level and the one-loop contributions to the light-neutrino mass matrix are quadratic in the Yukawa couplings, with the effect that the one-loop contribution is smaller than the tree-level one mainly because of the one-loop factor (16π2)1(16\pi^2)^{-1}. We also point out the possibility of generating radiatively--in this framework--the ratio of solar over atmospheric neutrino mass-squared differences, as needed for the large-mixing-angle MSW solution of the solar-neutrino problem.
Note:
  • 12 pages, Latex, no figures: one reference and some remarks added, version accepted for publication in Phys. Lett. B Report-no: UWThPh-2002-21
  • 14.60.Pq
  • 14.60.St
  • seesaw model
  • Higgs particle: doublet
  • neutrino: right-handed
  • neutrino: mass
  • radiative correction: higher-order
  • propagator: renormalization
  • neutrino: solar
  • neutrino: atmosphere