Search for the Decay of the Higgs Boson to Charm Quarks with the ATLAS Experiment

Abstract

A direct search for the Standard Model Higgs boson decaying to a pair of charm quarks is presented. Associated production of the Higgs and $Z$ bosons, in the decay mode $ZH\to {\ell }^{+}{\ell }^{-}c\bar{c}$ is studied. A dataset with an integrated luminosity of 36.1 fb${}^{-1}$ of $pp$ collisions at $\sqrt{s}=13$ TeV recorded by the ATLAS experiment at the LHC is used. The $H\to c\bar{c}$ signature is identified using charm-tagging algorithms. The observed (expected) upper limit on $\sigma (pp\to ZH)\times \mathcal{B}(H\to c\bar{c})$ is 2.7 ($3.9_{-1.1}^{+2.1}$) pb at the 95% confidence level for a Higgs boson mass of 125 GeV, while the Standard Model value is 26 fb.

29 pages in total, author list starting page 13, 2 figures, 3 tables, published version. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HIGG-2017-01/

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