Many BSM theories include extensions of the fermionic content of the Standard Model. Typically the new particles are very heavy, so that a smart way to deal with them is by means of the effective theory approach. In this thesis we are interested in new fermions admitting Yukawalike couplings ΨHq between the Higgs doublet and any Standard Model fermion. After a general overview of the possible extensions compatible with SU(3)×SU(2)×U(1) gauge invariance, we'll focus on a particular vectorlike quark of charges (3_c,2_W, 7/6_Y). For this model we will first perform a review of the known results present in literature and then move towards the derivation of the effective theory, which will be computed up to 1loop by means of the functional integral method. Finally by confronting the obtained Wilson coefficients with their experimental constraints we will obtain new bounds on the coupling constants of this model.
Effective theory for fermionic extensions of the Standard Model
Valenti, Alessandro
2020/2021
Abstract
Many BSM theories include extensions of the fermionic content of the Standard Model. Typically the new particles are very heavy, so that a smart way to deal with them is by means of the effective theory approach. In this thesis we are interested in new fermions admitting Yukawalike couplings ΨHq between the Higgs doublet and any Standard Model fermion. After a general overview of the possible extensions compatible with SU(3)×SU(2)×U(1) gauge invariance, we'll focus on a particular vectorlike quark of charges (3_c,2_W, 7/6_Y). For this model we will first perform a review of the known results present in literature and then move towards the derivation of the effective theory, which will be computed up to 1loop by means of the functional integral method. Finally by confronting the obtained Wilson coefficients with their experimental constraints we will obtain new bounds on the coupling constants of this model.File  Dimensione  Formato  

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https://hdl.handle.net/20.500.12608/22818