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arXiv · 1512.01243

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

Celine Degrande·Katy Hartling·Heather E. Logan·Andrea D. Peterson·Marco Zaro
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Abstract

We study the phenomenology of the Georgi-Machacek model at next-to-leading order (NLO) in QCD matched to 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 H_5^0, H_5^+/-, and H_5^++/-- through vector boson fusion (VBF), associated production with a vector boson (V H_5), and scalar pair production (H_5 H_5). For these production mechanisms we compute NLO corrections to production rates as well as to differential distributions. Our results demonstrate that the Standard Model (SM) overall K-factors for such processes cannot in general be directly applied to beyond-the-SM distributions, due both to differences in the scalar electroweak charges and to variation of the K-factors over the differential distributions.

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Celine Degrande, Katy Hartling, Heather E. Logan, Andrea D. Peterson, Marco Zaro. 2015-12-03. Automatic predictions in the Georgi-Machacek model at next-to-leading order accuracy. https://doi.org/10.1103/physrevd.93.035004

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