Split two-Higgs-doublet model and neutrino condensation

F. Wang; W. Wang; J. M. Yang

doi:10.1209/epl/i2006-10293-3

All issues

Volume 76 / No 3 (November 2006)

Europhys. Lett., 76 3 (2006) 388-394

Abstract

Issue		Europhys. Lett. Volume 76, Number 3, November 2006


Page(s)		388 - 394
Section		The physics of elementary particles and fields
DOI		https://doi.org/10.1209/epl/i2006-10293-3
Published online		07 October 2006

Europhys. Lett., 76 (3), pp. 388-394 (2006)

Split two-Higgs-doublet model and neutrino condensation

F. Wang¹, W. Wang¹ and J. M. Yang²^,1

¹ Institute of Theoretical Physics, Academia Sinica - Beijing 100080, PRC
² CCAST(World Laboratory) - P.O. Box 8730, Beijing 100080, PRC

Received: 29 May 2006
Accepted: 14 September 2006

Abstract

We split the two-Higgs-doublet model by assuming very different vevs for the two doublets: the vev is at weak scale (174 $\un{GeV}$ ) for the doublet $\Phi_1$ and at neutrino-mass scale ( $10^{-2}\mbox{--}10^{-3}\un{eV}$ ) for the doublet $\Phi_2$ . $\Phi_1$ is responsible for giving masses to all fermions except neutrinos; while $\Phi_2$ is responsible for giving neutrino masses through its tiny vev without introducing the see-saw mechanism. Among the predicted five physical scalars H, h, A⁰ and $H^{\pm}$ , the CP-even scalar h is as light as $10^{-2}\mbox{--}10^{-3}\un{eV}$ while the others are at weak scale. We identify h as the cosmic-dark-energy field and the other CP-even scalar H as the Standard Model Higgs boson; while the CP-odd A⁰ and the charged $H^{\pm}$ are the exotic scalars to be discovered at future colliders. Also we demonstrate a possible dynamical origin for the doublet $\Phi_2$ from neutrino condensation caused by some unknown dynamics.

PACS: 12.60.Fr – Extensions of electroweak Higgs sector / 12.60.Rc – Composite models / 14.60.Pq – Neutrino mass and mixing

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