Search for ttH production in multilepton final states at sqrt(s) = 13 TeV

A search for the standard model Higgs boson produced in association with a top quark pair is presented. Data collected by the CMS experiment in $\mathrm{pp}$ collisions at a center of mass energy of $\sqrt{s}=13~\mathrm{TeV}$ and corresponding to an integrated luminosity of 2.3~fb$^{-1}$ are used. The analysis targets the $\mathrm{WW}^{*}$, $\mathrm{ZZ}^{*}$ and $\tau\tau$ decay channels of the Higgs boson by selecting final states with two same-sign leptons or more than three leptons, produced in association with b jets. The signal strength is measured to be $0.6^{+1.4}_{-1.1}$ times the standard model expectation. The observed 95\% confidence level upper limit on the $\mathrm{t}\overline{\mathrm{t}}\mathrm{H}$ production cross section is 3.3 times the standard model expectation, compared to the 2.6 expected in absence of a signal.