Seminarium "Teoria cząstek elementarnych i kosmologia"

Direct searches for New Physics at the Large Hadron Collider still remain unsuccessful. This has led to a paradigm shift towards indirect searches which rely on discrepancies between theory predictions and experimental measurements. Not long ago, experimental data was only compared to Monte Carlo simulations obtained with the help of parton-shower event generators, while precise theoretical predictions were only available for simplified process definitions far from the experimental reality. In consequence, the usefulness of the measurements was, and still is to a large extent, limited due to systematic uncertainties. In order to remedy this situation, there is an ongoing tremendous effort of the theory community towards a better understanding of Standard Model effects in a realistic setting. I will review the current leading edge results, in particular predictions for higher multiplicity final states, precise predictions for standard-candle processes, and the road towards improved modelling at fixed order perturbation theory. I will also mention progress beyond strict fixed order calculations.