Authors

R. Contino, D. Greco, D. Liu

Added By

Da Liu

References

arXiv: 1410.2883

Abstract

We have implemented the interactions of the composite vector resonances with SM particles and lighter top partners, which are generally predicted by CHMs. We focus on the minimal coset SO(5)/SO(4) and consider three representations separately: (3,1), (1,3) and (1,1). Concerning the heavy fermionic sector, we study two cases: fourplet and singlet. Email: roberto.contino@epfl.ch, davide.greco@epfl.ch, liuda@itp.ac.cn Note that this model is still under beta.

Information

The four models discussed in the paper (arXiv: 1410.2883) have been implemented in the parton level generator MadGraph5 for the simulation of Monte Carlo events. All the trilinear interaction vertices for the vector resonances including SM particles and top partners have been introduced in the UFO file, following the conventions of Appendix C. In order to study the cascade decay of rho to lighter top partners, we also implement the couplings between the top partners and the SM particles, where for simplicity we only include the vertice with only one top partner. A Mathematica} calculator is also provided, which performs a numerical diagonalization of the vector mass matrix and computes all the physical quantities, masses and trilinear couplings between heavy vectors and SM particles, after the input parameters are specified. For the top partner sector, diagonalization of the mass matrices to full order in xi has also been performed and the physical couplings involving the heavy vector resonance and the top partners, the top partner and the SM particles have been calculated. We also stress that our numerical code has been designed not only to simulate the production and decay of vector resonances, but also to study WW scattering processes at the LHC and at future colliders. In order for these processes to be suitably simulated in the presence of vector resonances, also the modifications to the couplings g_{HWW}, g_{HZZ}, g_{HHWW}, g_{HHZZ} and g_{HHH} after rotation to the mass eigenstate basis must be properly taken into account. The corrections to the first four couplings are numerically calculated by the Mathematica file and in particular the vertices g_{HHWW} and g_{HHZZ} are the only four-particles interactions that are numerically derived by the calculator. On the other hand, the modification of the trilinear Higgs coupling g_{HHH} for the minimal model with elementary fermions embedded in the vector representation of SO(5) (MCHM5) has also been implemented in the code accordingly.

Tools

CalcHEP [model]

Model History

2014-10-23 10:58:55
2014-10-23 10:55:33
2014-10-21 10:13:12

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