Effective model for modifications to Higgs Yukawa couplings

Authors

• Natascia Vignaroli
  • University of Naples and INFN Naples
  • natascia.vignaroli@…

Description of the model

This model is an extension of the SM, including dim-6 effective operators which generate modifications to the Higgs Yukawa couplings to quarks, as described in Ref [1] :

$\mathcal{L} =  -y^{NP}_d \frac{ |H|^2}{vev^2}\, \bar{Q}_L d_R  H -
y_u^{NP} \frac{|H|^2}{vev^2}\, \bar{u}_R Q_L  H + h.c.$

where vev=246 GeV and y_uNP, y_dNP are matrices in the flavor space. By default, they are set to the diagonal values y_uNP =diag(YukU, YukC, YukT), y_dNP =diag(YukD, YukS, YukB), where Yuk* are adjustable external parameters.

Model files

• YqHEFT.fr: the main model file.
• DiagonalCKM.rst: diagonal CKM restriction.
• YqHEFT_UFO.zip: The model files in UFO format (for MadGraph 5).

Notes:

• By default y_uNP =(0,0,1) , y_dNP=(0,0,0).

References

[1] A. Falkowski, S. Ganguly, P. Gras, J. M. No, K. Tobioka, N. Vignaroli and T. You, Light quark Yukawas in triboson final states, JHEP 04, 023 (2021), ​arXiv:2011.09551 [hep-ph].

[2] N. Vignaroli, Off-Shell Probes of the Higgs Yukawa Couplings: Light Quarks and Charm, Symmetry 14, no.6, 1183 (2022), ​arXiv:2205.09449 [hep-ph].