  A search is performed for Higgs-boson-mediated flavor-changing neutral
currents in the decays of top quarks. The search is based on proton-proton
collision data corresponding to an integrated luminosity of 19.7 inverse
femtobarns at a center-of-mass energy of 8 TeV collected with the CMS detector
at the LHC. Events in which a top quark pair is produced with one top quark
decaying into a charm or up quark and a Higgs boson (H), and the other top
quark decaying into a bottom quark and a W boson are selected. The Higgs boson
in these events is assumed to subsequently decay into either dibosons or
difermions. No significant excess is observed above the expected standard model
background, and an upper limit at the 95% confidence level is set on the
branching fraction B(t to Hc) of 0.40% and B(t to Hu) of 0.55%, where the
expected upper limits are 0.43% and 0.40%, respectively. These results
correspond to upper limits on the square of the flavor-changing Higgs boson
Yukawa couplings |lambda[tc]^H|^2 < 6.9E-3 and |lambda[tu]^H|^2 < 9.8E-3.
