Search for monotop in the muon channel in proton-proton collisions at $\sqrt{s}=$ 8 TeV

A search for monotop events is performed with LHC proton-proton collisions at ${ \sqrt{s} = 8} $ TeV using a data set corresponding to an integrated luminosity of 19.7 fb$^{-1}$, recorded by the CMS experiment. We select events containing a single top quark decaying leptonically produced in association with missing transverse energy. Events are required to have one isolated muon, an energetic b-tagged jet and large missing transverse energy. The transverse mass of the W boson from the top quark is used to perform the search. No deviation from standard model predictions is observed and exclusion limits at 95\% confidence level for resonant and flavour changing production modes of monotop final state are computed. For a coupling strength of 0.1, the resonant production mode is excluded for scalar resonant particle masses up to 1610~GeV and fermionic invisible particle masses ranging from 10 to 200 GeV. The flavour changing production mode is excluded for invisible vector particle masses lower than 523 GeV.