Model : VLQ (Model-Independent) (at 2014-04-27 11:57:12)
AuthorsMathieu Buchkremer (email@example.com) ; Giacomo Cacciapaglia (firstname.lastname@example.org) ; Aldo Deandrea (email@example.com) ; Luca Panizzi (firstname.lastname@example.org)
References Nucl.Phys. B876 (2013) 376-417 ; M. Buchkremer, G. Cacciapaglia, A. Deandrea, L. Panizzi ; Model Independent Framework for Searches of Top Partners
AbstractThis model is an extension of the Standard Model (SM) with new top partners, intended for model-independent searches of Vector-Like quarks. The corresponding FeynRules implementation is based on a minimal effective Lagrangian description, which provides a direct connection between experimental observables and the new quark couplings. All fields and parameters are defined accordingly to the parameterisation detailed in . The particle content, Feynman rules and parameters of the model are summarized in .
InformationAs a generic framework, the four Vector-Like states X (Q=5/3), T (2/3), B (-1/3) and Y (-4/3) are introduced as new spin 1/2 class members coupling generically to any of the SM quark generations. Each class defines a specific top partner with a fixed electric charge, without any assumption on the other quantum numbers. Together with the new fermion fields definitions, the following interactions are added to the SM Lagrangian given in . The new user-defined parameters consist of: -the KAPPA block : the top partners coupling strengths (set to 1 by default), -the MASS block : the corresponding quark masses (set to 600 GeV by default), -the DECAY block : the corresponding total widths (see the note below), -the XI block : the corresponding branching ratios into W, Z, and Higgs bosons, -the ZETA block : all top partners couplings to the three SM quark generations.