Constraints on the septet-doublet mixing models from oblique parameters - INSPIRE

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Constraints on the septet-doublet mixing models from oblique parameters

Chao-Qiang Geng
(
- CUPT, Chongqing and
- NCTS, Hsinchu and
- Taiwan, Natl. Tsing Hua U.
)
,
Lu-Hsing Tsai
(
- CUPT, Chongqing
)
,
Yao Yu
(
- NCTS, Hsinchu
)

Nov 23, 2014

11 pages

Published in:

Phys.Rev.D 91 (2015) 7, 073014

Published: Apr 14, 2015

e-Print:

1411.6344 [hep-ph]

DOI:

10.1103/PhysRevD.91.073014

View in:

ADS Abstract Service

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Abstract: (APS)

The limitations of doublet-septet mixing models resulting from the deviations of electroweak oblique parameters ΔS and ΔT are studied. In the minimal model, the mixture of the septet η and the scalar doublet in the standard model (SM) is driven by a non-Hermitian dimension-7 operator. For a smaller bare mass of the septet, ΔS puts a stringent constraint on the mixing angle sinβ between the CP-odd neutral parts of the SM Higgs doublet and η. In general, increasing the mass of the scalar septet Mη will enhance the deviation of T from the SM, whereas it decreases the magnitude of ΔS for a larger bare mass within the range Mη≲400 GeV. We also examine two extended models from the ordinary doublet-septet mixture pattern. One of them is based on an inert doublet-septet mixing pattern, in which there is no vacuum expectation value for the neutral component of η and stable dark matter could naturally exist. For a benchmark point with the inner doublet mass of Mχ=250 and Mη=400 GeV in this model, the mixing coefficient is found to be less than 1.8. The other extension is constructed by imposing a doubly charged scalar mixed with the doubly charged component of the septet. Apart from the contribution by the septet-doublet admixture, ΔS is suppressed by a factor of sW2 and ΔT has a significant constraint due to the vanishing vacuum polarization of Z at the momentum transfer p2=0.

Note:

19 pages, 3 figures, revised version accepted by PRD

12.15.Lk
12.60.Fr
14.80.-j
new physics
multiplet: scalar
scalar particle: multiplet
scalar particle: doublet
scalar particle: new particle
scalar particle: mass
mass: scalar

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