Changes between Version 2 and Version 3 of VLQ_xtdoubletvl


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Timestamp:
Jul 3, 2013, 10:33:31 AM (11 years ago)
Author:
Mathieu Buchkremer
Comment:

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  • VLQ_xtdoubletvl

    v2 v3  
    2020   
    2121    == Description & Model Implementation ==
    22 This model is an simplified version of the VLQ FeynRules model, including a single vector-like (X,T) doublet (Q=5/3, 2/3), with non-zero mixings to the first and third generation SM quarks [1] [2], as described in the dedicated study [3]. The pattern of allowed couplings is such that X decays 100% to W bosons, while T decays 50% in Z and 50% in H bosons, in the asymptotic limit where their (degenerate) masses go to infinity. The corresponding FeynRules implementation is based on the VLQ.fr model description, which provides a direct connection between experimental observables and the new quark couplings. The model file [attachment:xtdoubletvl.fr.zip] adds the following interactions to the SM Lagrangian:[[Image(XTDoublet.png)]]
     22This model is an simplified version of the VLQ FeynRules model, including a single vector-like (X,T) doublet (Q=5/3, 2/3), with non-zero mixings to the first and third generation SM quarks [1] [2], as described in the dedicated study [3]. The pattern of allowed couplings is such that X decays 100% to W bosons, while T decays 50% in Z and 50% in H bosons, in the asymptotic limit where their (degenerate) masses go to infinity. The corresponding FeynRules implementation is based on the VLQ.fr model description, which provides a direct connection between experimental observables and the new quark couplings. The model file [attachment:xtdoubletvl.fr.zip] adds the following interactions to the SM Lagrangian:[[Image(XTDoublet2.png)]]
    2323
    2424The associated electromagnetic and strong interactions are also included, together with the X and T quarks kinetic and mass terms. The user-defined parameters, summarised in [attachment:Parameters.pdf], consist of: