Q/G Tagged Dijet Search and Calibration

The energy regime provided by the Large Hadron Collider using an integrated luminosity of 139.0 fb-1 of proton--proton collisions with a centre-of-mass energy o \newline s = $\surd $13 TeV opens a window to search for new physics beyond the standard model (BSM). Heavy resonance searches through the dijet mass spectrum have been previously performed at the ATLAS. \newline While untagged searches have a good sensitivity to strongly produced particles that decay into generic dijets with large cross sections, gluon taggers, in particular Number of charged tracks (Ntrk) and Boosted Decision Trees (BDT) can improve the discovery significance of di-gluon resonances \newline However, quark-versus-gluon jet tagging is difficult to calibrate due to hadronization.Thus, a "matrix \newline method" is applied to calibrate both NTrk and BDT taggers. Ntrk is further applied to show improvement on discovery significance. The Impact of systematic uncertainties derived from the calibration procedure will also be shown.