Precision phenomenology at the LHC and characterization of theoretical uncertainties

Abstract : In light of the recent discovery of a Higgs boson at the LHC and of the contemporary absence of signals of new physics beyond the Standard Model (SM), precision physics has become the most important aim of the LHC physics program. Precision physics requires not only a thorough control over experimental uncertainties but also a good understanding of theoretical ones. In this thesis we approach the problem along two lines. At first we study the so-called missing higher order uncertainty in QCD with the Cacciari-Houdeau (CH) method and the scale variation procedure. As a by product we also provide an extension of the CH method to observables with initial state hadrons. Next we study the problem of the precise prediction and of the uncertainty estimation for two important Higgs observables: the total inclusive cross section and the transverse momentum distribution. With respect to the former, we study the production in gluon fusion and bottom annihilation (and its related uncertainties) in the Minimal Supersymmetric Standard Model (MSSM) for the production of the neutral scalars and of the pseudoscalar using the code SusHi. With respect to the latter, we study the transverse momentum distribution using our Monte Carlo event generators in the POWHEG-BOX framework for gluon fusion in the SM, MSSM and Two Higgs-Doublet Model (2HDM), with particular attention to the problem of including correctly the full of effect of the quarks running in the loop.
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Submitted on : Monday, November 3, 2014 - 10:43:00 PM
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  • HAL Id : tel-01079886, version 1

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Emanuele Angelo Bagnaschi. Precision phenomenology at the LHC and characterization of theoretical uncertainties. High Energy Physics - Phenomenology [hep-ph]. Université Paris Diderot - Paris 7, 2014. English. ⟨tel-01079886⟩

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