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Direct and Indirect Searches for New Physics with Diboson Final States at ATLAS (DIBOSON)
Date du début: 1 déc. 2011, Date de fin: 30 nov. 2016 PROJET  TERMINÉ 

"The Large Hadron Collider (LHC) at the European Organisation for Nuclear Research (CERN) promises a major step forward in the understanding of the fundamental nature of matter. Four large experiments at the LHC are complementary addressing the question of the origin of our Universe by searching for the so-called New Physics.The ”Standard Model” (SM), the theory that reflects our understanding of elementary particles and their fundamental interactions, has been extensively studied and experimentally verified to an unprecedented precision over the past decades. Despite its impressive success, there are many unanswered questions; which suggest that there is a more fundamental theory which incorporates New Physics. It is expected that at the LHC either New Physics beyond the SM will be discovered or excluded up to a very high energies, thus our view of the fundamental structure of the Universe will be challenged and probably revolutionized in the coming years.The ATLAS experiment is dedicated to address the key issue of ElectroWeak Symmetry Breaking (EWSB) and linked to this the search for the Higgs boson as well as the search for Physics beyond the Standard Model. The analysis proposed here is measurement and searches for New Physics in diboson processes . The New Physics effects in the diboson sector will be observed either directly, as in the case of new particle production decaying to diboson, e.g., new vector bosonsand extra-dimensions, or indirectly through deviations from the SM predictions of observable such as cross sections and asymmetries. Triple gauge boson self-coupling (TGC) are extremely sensitive to New Physics, thus a very powerful tool for indirect searches for New Physics contributions through loop corrections.At the LHC, the unprecedented center-of-mass energy and luminosity will allow to measure the TGC with a high accuracy and to probe regions that are inaccessible at previous experiments even with modest amounts of data."