Search for new physics in $\sqrt{S}$ = 13 TeV proton-proton collisions, using jet substructure techniques with the CMS detector at the LHC

An inclusive search for new physics with jets and missing transverse energy is presented, in pp-collisions at a centre-of-mass energy of $\sqrt{s}$ = 13 TeV. The variables $\alpha$ ${_T}$ and $\Delta$$\phi$*${_min}$ are employed to discriminate between events with genuine missing energy and events with a false source of missing energy, due to either a misreconstruction or a physics process. The use of jet substructure techniques as a means to tag jets from boosted particle decays, a phenomena associated to signal processes, is employed. The search was performed on a dataset corresponding to an integrated luminosity of 12.9 fb${^-1}$ collected by the CMS detector at the LHC in 2016. The search categorises events according to the total jet multiplicity, multiplicity of jets arising from bottom quarks and the total hadronic energy. An additional event category, corresponding to the subjet multiplicity of top quark tagged or W boson tagged jets that followed the application of jet substructure techniques, is constructed to further categorise events. The addition of such a category allows a direct comparison to results obtained using the nominal event categories, and provided a direct gauge on the sensitivity that jet substructure techniques bring. The observed event counts are found to be compatible with the expected contribu- tions from Standard Model processes, and from which the results are interpreted in the context of squark and gluino pair produced simplified models, and a dark matter pseu- doscalar mediated simplified model. The use of jet substructure techniques, to further classify events containing boosted top quarks or W bosons, shows an improvement in sensitivity in the exclusions limits set on the simplified models.