Probing Extended Scalar Sectors with Precision $e^{+}{e}^{-}\to Zh$ and Higgs Diphoton Studies

Abstract

We compute the one-loop corrections to $\sigma (e^{+}{e}^{-}\to Zh)$ arising from representative extended Standard Model scalar sector scenarios. According to the new scalar $\mathrm{SU}(2{)}_{\mathrm{L}}$ representations, we consider the inert doublet, real and complex triplet, quintuplet, and septuplet models. With the sub-percent level precision expected for prospective future $e+e-$ collider measurements of $\sigma (e^{+}{e}^{-}\to Zh)$, studies of the Higgsstrahlung process will probe extended scalar sector particle spectrum and interactions in a manner complementary to direct searches at the Large Hadron Collider and possible future $pp$ colliders. We also compare with the sensitivity of future Higgs diphoton decay rate measurements. We find that the $\sigma (e^{+}{e}^{-}\to Zh)$ and $\Gamma (h\to \gamma \gamma )$ complementarity is particularly pronounced for the complex triplet model.

arXiv comment43 pages, 11 figures; v3: major revision requested by editor

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• One-loop QED and Weak Corrections to $\gamma \gamma \to H^{\pm }{H}^{\mp }$ in the Inert Doublet Model