Final Activity Report Summary - ARTEMIS (Investigation of the electroweak symmetry breaking and the origin of mass using the first data of the ATLAS detector at the LHC) The ARTEMIS Research Training Network started its activities in October 2006 and came to an end in September 2010. ARTEMIS had an ambitious science programme, linked to the ATLAS experiment at CERN's Large Hadron Collider (LHC), which is arguably the most challenging and exciting scientific experiment to date in human history. The scientific objectives of ARTEMIS were: 1. To improve and optimise the performance of the ATLAS detector in order to maximise its discovery potential; 2. To make key measurements of well-known Particle Physics processes, in order to (a) validate/demonstrate the correct behaviour of the ATLAS detector; and (b) test/confirm the predictions of the Standard Model (the theory of Particle Physics) at the new high energy regime accessible with the LHC; 3. To optimise the Higgs boson discovery sensitivity of ATLAS and play a leading role in the search for the Higgs with the ATLAS data. The ARTEMIS institutes had a major impact in all the above activities within the ATLAS experiment. ARTEMIS scientists played a leading role in commissioning vital components of the ATLAS detector, proposed novel techniques to extend the ATLAS sensitivity to the discovery of the Higgs boson, and were at the forefront of analysing the early ATLAS data and producing the first High Energy Physics publications in this new energy regime, that was never explored before. In addition to pursuing the scientific objectives mentioned above, ARTEMIS delivered an extensive training program that provided to the ERs and ESRs, as well as other young researchers from the participating institutes, essential skills in experimental and theoretical particle physics, as well as complementary skills. The ERs and ESRs of ARTEMIS benefited greatly from this training programme, as well as from being immersed in one of the most exciting scientific environments in decades. This made their involvement in ARTEMIS an important stepping stone in their careers and enhanced their career prospects.
