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Master Thesis

Search for New Physics with the Atlas detector at LHC

Abstract : Despite its' 40 years of experimental success, the Standard Model, a theory which describes fundamental particles as well as three fundamental interactions, has theoretical and experimental limitations. These lead to the existence of theories beyond the Standard Model, called New Physics. This report presents the search for a new particle present in many theories beyond the Standard Model: the W' boson. This year, the Large Hadron Collider is entering run II, which will see proton-proton collisions take place at an unprecedented centre of mass energy of 13 TeV. This high energy will provide the mouth watering prospect of fnding New Physics. Studies that have been made during this internship have used Monte Carlo simulations of events that we should see in the Atlas detector at LHC during run II. These studies are grouped into two main parts. The rst part consists in studies at the parton level, where we see the impact of physics aspects as parton distribution functions and gluon radiations by quarks on the reconstructed mass of the W' boson. We also see the increased potential for discovery of this new particle by comparing invariant mass distributions and cross-sections at centre of mass energies of 8 TeV and 13 TeV. The second part describes the step-by-step reconstruction of the W' boson in a detector simulation. The main difficulties in these steps are pointed out, as well as several ideas for improvements for run II. Background processes and the selection criteria that have been used to discriminate them from the signal are introduced, and optimisations of these criteria as well as efficiency tests for new ones are presented. This search is the sequel to a large number of studies made during run I, and will look to continue to improve the seek for beyond the Standard Model particles.
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https://dumas.ccsd.cnrs.fr/dumas-01228729
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Submitted on : Wednesday, December 9, 2015 - 9:49:27 AM
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  • HAL Id : dumas-01228729, version 1

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Louis Franck. Search for New Physics with the Atlas detector at LHC. Physics [physics]. 2015. ⟨dumas-01228729⟩

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