i may leave you this weekend with my old notes in qft since no updates yet re to my exercise notes in qft ok til next week or perhaps this coming sunday evening
https://foxtrotpaparomeo.wordpress.com/category/quantum-field-theory-calculations/

(well back to the main course of my thread )
there is still the Legendre transformation to carry out in order to get to the interaction Hamiltonian of interest and such involves the interaction of Higgs boson with the electrons
https://foxtrotpaparomeo.wordpress.com/2022/12/15/15122022-updatesfirst-order-calculations-of-the-probability-amplitude-for-higgs-boson-to-electron-positron-decay/