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The Large Hadron Collider (LHC) is the largest and most complex high-energy collider ever built. By collidings protons at unprecedented high energies the LHC is able to study the fundamental interactions at the smallest distances ever probed, and to recreate the conditions that existed right after the Big Bang. In its first years of run, the machine already delivered an impressive amount of results, with the discovery of a scalar resonance whose properties closely resemble those expected for the Higgs boson predicted by the Standard Model. The discovery of the Higgs boson, however, has not been followed by any evidence for a new physics signal. This comes in some sense as a surprise: since the SM cannot be the ultimate theory of nature, one expects new physics to show up at some point and the natural completions of the SM indeed predict new particles with masses close to the EW scale. The coming years offer a rich physics program, by allowing to search for Beyond the Standard Model signals with a high-quality data set.
To establish the existence of new physics, either in the form of a deviation from the Standard Model in some relevant observable, or as an excess in the tail of some distribution, a solid control on what is expected from the Standard Model is necessary. Thus, high precision from the theory side is demanded.
