Search for new physics at 13 TeV with the CMS detector

The first 13 TeV data recorded by the CMS experiment are first used to search for di-jet resonances. With an integrated luminosity of 42 pb$^{-1}$, di-jet resonances with invariant masses lower than 2.3 to 5.1 TeV, depending of the interpretation model, are excluded at 95\pct of confidence level. While other searches requires more integrated luminosity, analyses are being prepared by estimating selection efficiencies and backgrounds contamination from data, and by performing first data-to-MC comparisons. Good descriptions of the data from the simulation are observed, which show the good performance of the CMS detector.