Effective field theory for nTGC

Author : Celine Degrande

References :

• C. Degrande, A basis of dimension-eight operators for anomalous neutral triple gauge boson interactions, ​arXiv:1308.6323

Description

This !MadGraph5 model is the implementation of the dimension-eight operators inducing neutral triple gauge boson couplings (nTGC). Namely, the model contains all the four dimension-eight operators that modify the neutral 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. $C_i/\Lambda^{4$ and are in TeV$}-2$. The name are self-explanatory, $C_{\widetilde{B}W}/\Lambda^{4$ is called CBtWL4, $C_{BW}/\Lambda}4$ is called CBWL4 and similarly for $C_{WW}$ and $C_{BB}$. The new interaction has also an order NP (for new physics) which is the power of ($1/\Lambda^{4$) of the amplitude.}

Operator	Coefficient	param_card name	limit at 95% C.L.(TeV${-4}$)
$i H\dagger \widetilde{B}_{\mu\nu}W{\mu\rho}\{D_\rho,D\nu\} H$	$C_{\widetilde{B}W}/\Lambda42$	CBtWL4	[-47 , 47]
$i H\dagger B_{\mu\nu}W{\mu\rho}\{D_\rho,D\nu\} H$	$C_{BW}/\Lambda42$	CBWL4	[-114 , 113 ]
$i H\dagger W_{\mu\nu}W{\mu\rho}\{D_\rho,D\nu\} H$	$C_{WW}/\Lambda42$	CWWL4	[-45 , 48]
$i H\dagger B_{\mu\nu}B{\mu\rho}\{D_\rho,D\nu\} H$	$C_{BB}/\Lambda42$	CBBL4	[-99 , 101]

The limits have been obtained by inverting the values of the anomalous couplings from the PDG 2012 and JHEP 1301 (2013) 063.