Higgs boson decay to light jets at the LHC

Citations Over TimeTop 10% of 2017 papers

Abstract

We study the Higgs boson ($h$) decay to two light jets at the 14 TeV High-Luminosity-LHC (HL-LHC), where a light jet ($j$) represents any nonflavor-tagged jet from the observational point of view. The decay mode $h\ensuremath{\rightarrow}gg$ is chosen as the benchmark since it is the dominant channel in the Standard Model, but the bound obtained is also applicable to the light quarks ($j=u$, $d$, $s$). We estimate the achievable bounds on the decay branching fractions through the associated production $Vh(V={W}^{\ifmmode\pm\else\textpm\fi{}},Z)$. Events of the Higgs boson decaying into heavy (tagged) or light (untagged) jets are correlatively analyzed. We find that with $3000\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ data at the HL-LHC, we should expect approximately $1\ensuremath{\sigma}$ statistical significance on the SM $Vh(gg)$ signal in this channel. This corresponds to a reachable upper bound $\mathrm{BR}(h\ensuremath{\rightarrow}jj)\ensuremath{\le}4$ ${\mathrm{BR}}^{\mathrm{SM}}(h\ensuremath{\rightarrow}gg)$ at 95% confidence level. A consistency fit also leads to an upper bound $\mathrm{BR}(h\ensuremath{\rightarrow}cc)<15$ ${\mathrm{BR}}^{\mathrm{SM}}(h\ensuremath{\rightarrow}cc)$ at 95% confidence level. The estimated bound may be further strengthened by adopting multiple variable analyses or adding other production channels.

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