wiki:EWdim6
Last modified 23 months ago Last modified on 01/06/16 11:21:18

Effective field theory for weak boson pair production

Author : Celine Degrande

References :

  • C. Degrande, N. Greiner, W. Kilian, O. Mattelaer, H. Mebane, T. Stelzer, S. Willenbrock, C. Zhang, arXiv:1205.4231 [hep-ph]

Description

This FeynRules model is the implementation of the weak boson effective field theory described in arXiv:1205.4231 [hep-ph]. Namely, the model contains all the five dimension-six operators that modify the triple gauge boson vertices. Their coefficients can be set in the param_card.dat. The parameters in the param_card are the full coefficients, i.e. $c_i/\Lambda^2$ and are in TeV-2. The name are self-explanatory, $c_{WWW}/\Lambda^2$ is called CWWWL2 and similarly for cW and cB , the coefficients of the CP violating operators $O_{\tilde{W}WW}\quad\text{and}\quad O_{\tilde{W}}$ are CPWWWL2 and CPWL2 respectively. The new interaction has also an order NP (for new physics) which is the power of $1/\Lambda$ of the amplitude. For example, an amplitude with one vertex for a dimension-six operator is proportional to $1/\Lambda^2$ and has NP=2.

Operator Coefficient param_card name limit at 68% C.L.(TeV${-2}$)
$\mbox{Tr}[W_{\mu\nu}W^{\nu\rho}W_{\rho}^{\mu}]$ $c_{WWW}/\Lambda^2$ CWWWL2 [-11.9 , -1.94]
$(D_\mu\Phi)^\dagger W^{\mu\nu}(D_\nu\Phi)$ $c_{W}/\Lambda^2$ CWL2 [-8.42 , 1.44]
$(D_\mu\Phi)^\dagger B^{\mu\nu}(D_\nu\Phi)$ $c_{B}/\Lambda^2$ CBL2 [-7.9 , 14.9]
$\mbox{Tr}[\tilde{W}_{\mu\nu}W^{\nu\rho}W_{\rho}^{\mu}]$ $c_{\tilde{W}WW}/\Lambda^2$ CPWWWL2 [-185.3 , -82.4]
$(D_\mu\Phi)^\dagger \tilde{W}^{\mu\nu}(D_\nu\Phi)$ $c_{\tilde{W}}/\Lambda^2$ CPWL2 [-39.3 , -4.9]

The limits have been obtained by inverting the values of the anomalous couplings from the PDG 2012.

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