Physics potential for the H$\rightarrow$ZZ$^{*}$ decay at the CEPC

Abstract

The precision of the yield measurement of the Higgs boson decaying into a pair of Z bosons process at the Circular Electron Positron Collider (CEPC) is evaluated. Including the recoil Z boson associated with the Higgs production (Higgsstrahlung) total three Z bosons are involved for this channel, from which final states characterized by the presence of a pair of leptons, quarks, and neutrinos are chosen for the signal. Two analysis approaches are compared and the final precision of σ ZH •BR(H → ZZ * ) is estimated to be 7.9% using a multivariate analysis technique, based on boosted decision trees. The relative precision of the Higgs boson width, using this H → ZZ * decay topology, is estimated by combining the obtained result with the precision of the inclusive ZH cross section measurement.