== Effective model for modifications to Higgs Yukawa couplings ==

=== Authors ===

 * Natascia Vignaroli
   * University of Naples and INFN Naples
   * natascia.vignaroli@na.infn.it

=== 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 [#point1 [1]] :

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

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

=== Model files ===

   * [/raw-attachment/wiki/YqHEFT/YqHEFT.fr YqHEFT.fr]: the main model file.
   * [/raw-attachment/wiki/YqHEFT/DiagonalCKM.rst DiagonalCKM.rst]: diagonal CKM restriction.
   * [/raw-attachment/wiki/YqHEFT/YqHEFT_UFO.zip YqHEFT_UFO.zip]: The model files in UFO format (for !MadGraph 5).

Notes:
   * By default  y,,u,,NP =(0,0,1) ,   y,,d,,NP=(0,0,0).


=== References ===

[=#point1] [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].

[=#point2] [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].