Changes between Version 1 and Version 2 of VLQ

05/03/13 08:59:32 (7 years ago)



  • VLQ

    v1 v2  
    1 === VLQ page ===
     1== VLQ Model ==
     3=== Authors ===
     5   * Mathieu Buchkremer
     6      * Universite catholique de Louvain (CP3)
     7      *
     9   * Giacomo Cacciapaglia
     10      * Universite de Lyon (CNRS/IN2P3)
     11      *
     13   * Aldo Deandrea
     14      * Universite de Lyon (CNRS/IN2P3)
     15      *
     17   * Luca Panizzi
     18      * University of Southampton (School of Physics and Astronomy)
     19      *
     21=== Description ===
     23This 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 [1]. The particle content, Feynman rules and parameters of the model are summarized in Parameters.pdf.
     25=== Model Implementation ===
     26As a generic framework, the four states $X_{5/3}$, $T_{2/3}$, $B_{-1/3}$ and $Y_{-4/3}$ are introduced as new spin 1/2 class members. Each class defines a specific top partner with a fixed electric charge, without any assumption on the other quantum numbers. The model files are designed to allow for a straightforward extension to additional vector-like fermions, simply by adding the new particles to the corresponding class (F[5], F[6], F[7] and F[8] for $X_{5/3}$, $T_{2/3}$, $B_{-1/3}$ and $Y_{-4/3}$ type quarks, respectively). Particles embedded in larger SU(2) representations may also be introduced under new classes, following the same model-independent prescription.
     28Together with the new fermion fields definitions, the following interactions are added to the SM Lagrangian