Changes between Version 1 and Version 2 of VLQ


Ignore:
Timestamp:
05/03/13 08:59:32 (7 years ago)
Author:
buchkremer
Comment:

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  • VLQ

    v1 v2  
    1 === VLQ page ===
     1== VLQ Model ==
     2
     3=== Authors ===
     4
     5   * Mathieu Buchkremer
     6      * Universite catholique de Louvain (CP3)
     7      * mathieu.buchkremer@uclouvain.be
     8
     9   * Giacomo Cacciapaglia
     10      * Universite de Lyon (CNRS/IN2P3)
     11      * g.cacciapaglia@ipnl.in2p3.fr
     12
     13   * Aldo Deandrea
     14      * Universite de Lyon (CNRS/IN2P3)
     15      * deandrea@ipnl.in2p3.fr
     16
     17   * Luca Panizzi
     18      * University of Southampton (School of Physics and Astronomy)
     19      * l.panizzi@soton.ac.uk
     20   
     21=== Description ===
     22   
     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.
     24   
     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.
     27   
     28Together with the new fermion fields definitions, the following interactions are added to the SM Lagrangian