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http://hdl.handle.net/10773/32651
Title: | CP violating hW+W− coupling in the standard model and beyond |
Author: | Huang, Da Morais, António P. Santos, Rui |
Keywords: | Beyond standard model CP violation |
Issue Date: | 2021 |
Publisher: | Springer Verlag |
Abstract: | Inspired by the recent development in determining the property of the observed Higgs boson, we explore the CP-violating (CPV) −𝑐CPVℎ𝑊+𝜇𝜈𝑊̃ −𝜇𝜈/𝜐 coupling in the Standard Model (SM) and beyond, where W±μν and 𝑊̃ ±𝜇𝜈 denote the W-boson field strength and its dual. To begin with, we show that the leading-order SM contribution to this CPV vertex appears at two-loop level. By summing over the quark flavor indices in the two loop integrals analytically, we can estimate the order of the corresponding Wilson coefficient to be 𝑐SMCPV∼(10−23), which is obviously too small to be probed at the LHC and planned future colliders. Then we investigate this CPV hW+W− interaction in two Beyond the Standard Model benchmark models: the left-right model and the complex 2-Higgs doublet model (C2HDM). Unlike what happens for the SM, the dominant contributions in both models arise at the one-loop level, and the corresponding Wilson coefficient can be as large as of (10−9) in the former model and of (10−3) for the latter. In light of such a large CPV effect in the hW+W− coupling, we also give the formulae for the leading one-loop contribution to the related CPV hZZ effective operator in the complex 2-Higgs doublet model. The order of magnitude of the Wilson coefficients in the C2HDM may be within reach of the high-luminosity LHC or planned future colliders. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/32651 |
DOI: | 10.1007/JHEP01(2021)168 |
ISSN: | 1126-6708 |
Publisher Version: | https://link.springer.com/article/10.1007/JHEP01(2021)168 |
Appears in Collections: | CIDMA - Artigos DFis - Artigos GGDG - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Huang2021_Article_CPViolatingHWWCouplingInTheSta.pdf | 501.96 kB | Adobe PDF | View/Open |
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