Constraints on the Higgs boson anomalous FCNC interactions with light quarks

Abstract

We consider the Higgs boson anomalous FCNC interactions with u, c, d, s and b quarks using the effective field theory framework. Constraints on anomalous couplings are derived from experimental results on Higgs boson production with subsequent decay into bb¯ pair at LHC with s=13 TeV. Upper limits on the branching fractions of H→bs¯ and H→bd¯ are set by performing a realistic detector simulation and accurately reproducing analysis selections of the CMS Higgs boson measurement in the four-lepton final state at s=13 TeV. The searches are projected into operation conditions of HL-LHC. Sensitivity at FCC-hh to anomalous FCNC interactions is studied based on Higgs boson production with H→γγ decay channel. It is shown that at FCC-hh machine one can expect to set the upper limits of the order of 10−2 at 95% CL for B(H→bs¯) and B(H→bd¯).