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A search for narrow resonances in dielectron and dimuon invariant massspectra has been performed using data obtained from proton-proton collisions atsqrt(s) = 13 TeV collected with the CMS detector. The integrated luminosity forthe dielectron sample is 2.7 inverse femtobarns and for the dimuon sample 2.9inverse femtobarns. The sensitivity of the search is increased by combiningthese data with a previously analysed set of data obtained at sqrt(s) = 8 TeVand corresponding to a luminosity of 20 inverse femtobarns. No evidence fornon-standard-model physics is found, either in the 13 TeV data set alone, or inthe combined data set. Upper limits on the product of production cross sectionand branching fraction have also been calculated in a model-independent mannerto enable interpretation in models predicting a narrow dielectron or dimuonresonance structure. Limits are set on the masses of hypothetical particlesthat could appear in new-physics scenarios. For the Z'[SSM] particle, whicharises in the sequential standard model, and for the superstring inspiredZ'[psi] particle, 95% confidence level lower mass limits for the combined datasets and combined channels are found to be 3.37 and 2.82 TeV, respectively. Thecorresponding limits for Kaluza-Klein gravitons arising in the Randall-Sundrummodel of extra dimensions with coupling parameters 0.01 and 0.10 are 1.46 and3.11 TeV, respectively. These results significantly exceed the limits based onthe 8 TeV LHC data.

Search for narrow resonances in dilepton mass spectra in proton-proton collisions at sqrt(s) = 13 TeV and combination with 8 TeV data