Authors

Artur Amorim
University of Porto
artur_at_lip.pt

Model Description

This model is an extension of the Standard Model (SM) that describes in a general way the flavour changing neutral interactions of the top quark with other particles of the SM. The implementation in FeynRules was done in the context of an effective field theory using dimension-six gauge invariant operators. This provides a direct connection between experimental observ-ables and the new anomalous couplings. Because this model just describes interactions of the top quark with other SM particles, there are no additional fields.

Model Implementation

Our lagrangian was derived in the context of an effective field theory using dimension-six gauge invariant operators. In general this lagrangian can be written as

where Cx is a complex number and Ox is a dimension-six gauge invariant operator. In [1, 2] we can find the list of the most relevant and non-redundant operators Ox that are responsible for top anomalous interactions, in partic- ular for flavour changing neutral interactions. Using the results from those papers we arrive at the lagrangian of equation 2 wich is added to the SM lagrangian

This lagrangian is implemented in the file topFCNC.fr wich is then loaded in Mathematica with the notebook topFCNC.nb .

References

[1] J.A. Aguilar Saavedra, A minimal set of top anomalous couplings, ​arXiv:0811.3842v2 [hep-ph], 2008
[2] J.A. Aguilar Saavedra, A minimal set of top-Higgs anomalous couplings, ​arXiv:0904.2387v2 [hep-ph], 2009