Soft gluon resummation in the signal-background interference process of gg(→ h∗) → ZZ
Chong Sheng LiCenter for High Energy Physics, Peking University, Beijing, 100871, ChinaHai Tao LiSchool of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, 100871, ChinaDing Yu ShaoAlbert Einstein Center for Fundamental Physics, Institut für Theoretische Physik, Universität Bern, Sidlerstrasse 5, CH-3012, Bern, SwitzerlandJian WangPRISMA Cluster of Excellence & Mainz Institute for Theoretical Physics, Johannes Gutenberg University, D-55099, Mainz, Germany
2015en
ABI
Abstract
We present a precise theoretical prediction for the signal-background interference process of gg(→ h∗) → ZZ, which is useful to constrain the Higgs boson decay width and to measure Higgs couplings to the SM particles. The approximate NNLO K-factor is in the range of 2.05 − 2.45 (1.85 − 2.25), depending on M ZZ , at the 8 (13) TeV LHC. And the soft gluon resummation can increase the approximate NNLO result by about 10% at both the 8 TeV and 13 TeV LHC. The theoretical uncertainties including the scale, uncalculated multi-loop amplitudes of the background and PDF+αs are roughly $$ \mathcal{O}\left(10\%\right) $$ at NNLL′. We also confirm that the approximate K-factors in the interference and the pure signal processes are the same.
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