Description
The Higgs boson self-coupling is a key parameter of the Standard Model, but is still experimentally unconstrained as it requires the challenging simultaneous production of two Higgs bosons in the same event. A search for a Higgs boson pair (HH) production is presented, in which one of the Higgs bosons decays to a b-quark pair (bb) and the other decays to WW, or ZZ, or \tau^+ \tau^-, with in each case a final state with two leptons + neutrinos. Events are selected to have exactly two b-tagged jets and two leptons with opposite electric charge and a large transverse missing energy (MET) in the final state, which is the fourth most significant HH final state after $b\bar{b}b\bar{b}$, $b\bar{b}\tau^\tau^-$, and multilepton. Events are classified using multivariate analysis algorithms to separate the HH events from other Standard Model processes. Upper limits on the production cross section and the self-interaction coupling parameters.
