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arXiv · 1504.02388

Soft gluon resummation in the signal-background interference process of $gg(\to h^*) \to ZZ$

Chong Sheng Li·Hai Tao Li·Ding Yu Shao·Jian Wang
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Abstract

We present a precise theoretical prediction for the signal-background interference process of $gg(\to h^*) \to ZZ$, 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$+\alpha_s$ are roughly $\mathcal{O}(10\%)$ at ${\rm NNLL'}$. We also confirm that the approximate $K$-factors in the interference and the pure signal processes are the same.

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Chong Sheng Li, Hai Tao Li, Ding Yu Shao, Jian Wang. 2015-04-09. Soft gluon resummation in the signal-background interference process of $gg(\to h^*) \to ZZ$. https://doi.org/10.1007/jhep08(2015)065

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