期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 5, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP05(2018)059
关键词
NLO Computations; QCD Phenomenology
资金
- Swiss National Science Foundation (SNF) [CRSII2-141847, 200021-156585]
- Research Executive Agency (REA) of the European Union [PITN-GA-2012-316704]
- STFC [ST/P001246/1] Funding Source: UKRI
We consider QCD radiative corrections to Higgs boson pair production through gluon fusion in proton collisions. We combine the exact next-to-leading order (NLO) contribution, which features two-loop virtual amplitudes with the full dependence on the top quark mass M-t, with the next-to-next-to-leading order (NNLO) corrections computed in the large-M-t approximation. The latter are improved with different reweighting techniques in order to account for finite-M-t effects beyond NLO. Our reference NNLO result is obtained by combining one-loop double-real corrections with full M-t dependence with suitably reweighted real-virtual and double-virtual contributions evaluated in the large-M-t approximation. We present predictions for inclusive cross sections in pp collisions at root S = 13, 14, 27 and 100 TeV and we discuss their uncertainties due to missing M(t)effects. Our approximated NNLO corrections increase the NLO result by an amount ranging from +12% at A root S = 13 TeV to +7% at root S = 100 TeV, and the residual uncertainty of the inclusive cross section from missing M t effects is estimated to be at the few percent level. Our calculation is fully differential in the Higgs boson pair and the associated jet activity: we also present predictions for various differential distributions at A root S = 14 and 100 TeV, and discuss the size of the missing M-t effects, which can be larger, especially in the tails of certain observables. Our results represent the most advanced perturbative prediction available to date for this process.
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