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A search for the resonant production of high-mass photon pairs is presented.The analysis is based on samples of proton-proton collision data collected bythe CMS experiment at center-of-mass energies of 8 and 13 TeV, corresponding tointegrated luminosities of 19.7 and 3.3 inverse femtobarns, respectively. Thesearch focuses on spin-0 and spin-2 resonances with masses between 0.5 and 4TeV and with widths, relative to the mass, between 1.4E-4 and 5.6E-2. Limitsare set on scalar resonances produced through gluon-gluon fusion, and onRandall-Sundrum gravitons. A modest excess of events compatible with a narrowresonance with a mass of about 750 GeV is observed. The local significance ofthe excess is approximately 3.4 standard deviations. The significance isreduced to 1.6 standard deviations once the effect of searching under multiplesignal hypotheses is considered. More data are required to determine the originof this excess.

Search for resonant production of high-mass photon pairs in proton-proton collisions at sqrt(s) = 8 and 13 TeV