Changes between Version 3 and Version 4 of MDMmodel


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Timestamp:
Jun 21, 2014, 3:20:47 PM (10 years ago)
Author:
Liang
Comment:

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  • MDMmodel

    v3 v4  
    2525This model is an extension of the SM by introducing a linearized singlet dilaton field ''S'' and a vector-like top partner ''T'' with the same quantum number as the right-handed top quark. The low energy effective Lagrangian of the MDM is given by [1] [2] [3]:
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     27[[Image(the low energy effective Lagrangian of the MDM.png)]]
     28
    2729where ''L'',,SM,, is the part of the SM Lagrangian without the Higgs potential, ''M'' presents the scale of a certain strong dynamics in which the fields ''T'' and ''S'' are involved, ''q,,3L,,'' is the ''SU(2),,L,,'' left-handed quark doublet of the third generation, and ''M,,H,,'', ''M,,S,,'', ''λ,,S,,'', ''κ'' and ''λ,,H,,'' are all free parameters describing the new Higgs potential.
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    … …  
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    4951'''Validation'''
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    5053The Feynman rules were computed by hand and compared with the [http://feynrules.irmp.ucl.ac.be/ FeynRules] vertices and found to agree. Furthermore, the three main partial decay widths of top partner were calculated by hand, compared with the numerical results both in CalcHEP with Feynman gauge and Unitary gauge and in MadGraph with Unitary gauge, and found to agree. We . Moreover, the hermiticity of the Lagrangian was tested at the Feynman rules level.
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