Production and measurement of $e^{+}e^{-}\rightarrow c\bar{c}$ signatures at the 250 GeV ILC

International audienceThis document discusses for the first time the experimental prospects on the measurement of cross section and the forward-backward asymmetry in $e^{-}e^{+}\rightarrow c\bar{c}$ collisions at 250 GeV at the International Linear Collider operating polarised beams. The cross section will be normalised to the total hadronic cross section. We discuss the results for an analysis assuming the integrated luminosity of 2000 fb$^{-1}$ foreseen in the baseline project. The measurement requires determining the charge of both jets identified as originated by a $c$-quark. The charge measurement is optimally performed using the precise micro-vertex detector of the detector ILD and the charged kaon identification provided by the $\frac{dE}{dx}$ information of its TPC. Thanks to the beam polarisation, we can separate the four independent chirality combinations of the electroweak couplings, enhancing in this way the sensitivity to new physics effects. We show that due to the unprecedented precision that will be achieved by the ILC for these observables, the ILC will be sensitive to the existence of beyond the standard model Randal Sundrum resonances of several tens of TeV