The effective field theory for single Higgs and double Higgs production beyond leading order


Long-Bin Chen

  • Guangzhou University
  • chenlb_AT_gzhu_dot_edu_dot_cn

Hai Tao Li

  • LANL
  • haitaoli_AT_lanl_dot_gov

Hua-Sheng Shao

  • huasheng_dot_shao_AT_lpthe_dot_jussieu_dot_fr

Jian Wang

  • Shandong University
  • j_dot_wang_AT_sdu_dot_edu_dot_cn


Description of the model

In the infinite top-quark mass limit, the interaction between the Higgs field and the gluon field can be effectively described by

$\mathcal{L}_{\rm eff}=-\frac{1}{4}(C_h \frac{h}{v}-C_{hh}\frac{h^2}{2v^2})G^a_{\mu\nu}G^{a~\mu\nu}$

where $G^a_{\mu\nu}$ is the gluon field strength tensor.

The NLO UFO model based on $\mathcal{L}_{\rm eff}+\mathcal{L}_{\rm SM}$ can be downloaded from here.

The analytical expressions for $R_2$ Feynman rules can be found in appendix B of arXiv:1912.13001.

A pedagogical example in MadGraph5_aMC@NLO

In order to handle mixed-order senarios, one has to use the version 3.0.1+ of MadGraph5_aMC@NLO.

> import model HEFT_DH_UFO
> generate p p > h h j / t t~ QCD=3 QED=2 NP=2 [QCD] QCD^2<=6 QED^2<=4 NP^2<=4
Last modified 7 weeks ago Last modified on 08/05/20 12:22:55