Journal of High Energy Physics (Oct 2020)

On the impact of non-factorisable corrections in VBF single and double Higgs production

  • Frédéric A. Dreyer,
  • Alexander Karlberg,
  • Lorenzo Tancredi

DOI
https://doi.org/10.1007/JHEP10(2020)131
Journal volume & issue
Vol. 2020, no. 10
pp. 1 – 30

Abstract

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Abstract We study the non-factorisable QCD corrections, computed in the eikonal approximation, to Vector-Boson Fusion single and double Higgs production and show the combined factorisable and non-factorisable corrections for both processes at O α s 2 $$ \mathcal{O}\left({\alpha}_s^2\right) $$ . We investigate the validity of the eikonal approximation with and without selection cuts, and carry out an in-depth study of the relative size of the non-factorisable next-to-next-to-leading order corrections compared to the factorisable ones. In the case of single Higgs production, after selection cuts are applied, the non-factorisable corrections are found to be mostly contained within the factorisable scale uncertainty bands. When no cuts are applied, instead, the non-factorisable corrections are slightly outside the scale uncertainty band. Interestingly, for double Higgs production, we find that both before and after applying cuts, non-factorisable corrections are enhanced compared to the single Higgs case. We trace this enhancement to the existence of delicate cancellations between the various leading-order Feynman diagrams, which are partly spoiled by radiative corrections. All contributions studied here have been implemented in proVBFH v1.2.0 and proVBFHH v1.1.0.

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