We study the phenomenology of the Georgi-Machacek model at next-to-leading order in QCD matched to a parton shower, using a fully automated tool chain based on MadGraph5-aMC@NLO and FeynRules. We focus on the production of the fermiophobic custodial fiveplet scalars H50, H5±, and H5±± through vector boson fusion (VBF), associated production with a vector boson (VH5), and scalar pair production (H5H5). For these production mechanisms we compute next-to-leading order corrections to production rates as well as to differential distributions. Our results demonstrate that the Standard Model overall K-factors for such processes cannot in general be directly applied to beyond-the-Standard-Model distributions, due both to differences in the scalar electroweak charges and to the variation of the K-factors over the differential distributions.

Automatic predictions in the Georgi-Machacek model at next-to-leading order accuracy / C. Degrande, K. Hartling, H.E. Logan, A.D. Peterson, M. Zaro. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 93:3(2016), pp. 035004.1-035004.13. [10.1103/PhysRevD.93.035004]

Automatic predictions in the Georgi-Machacek model at next-to-leading order accuracy

M. Zaro
2016

Abstract

We study the phenomenology of the Georgi-Machacek model at next-to-leading order in QCD matched to a parton shower, using a fully automated tool chain based on MadGraph5-aMC@NLO and FeynRules. We focus on the production of the fermiophobic custodial fiveplet scalars H50, H5±, and H5±± through vector boson fusion (VBF), associated production with a vector boson (VH5), and scalar pair production (H5H5). For these production mechanisms we compute next-to-leading order corrections to production rates as well as to differential distributions. Our results demonstrate that the Standard Model overall K-factors for such processes cannot in general be directly applied to beyond-the-Standard-Model distributions, due both to differences in the scalar electroweak charges and to the variation of the K-factors over the differential distributions.
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/811383
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