Download e-book for iPad: Search for H → b¯b in Association with a t¯t Pair in by Schmidt A.

By Schmidt A.

ISBN-10: 386644107X

ISBN-13: 9783866441071

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Extra resources for Search for H → b¯b in Association with a t¯t Pair in Proton-Proton Collisions at squre root of s =14 TeV

Example text

The motivation for constructing the theory like this instead of simply adding mass terms to the Lagrangian that break local gauge invariance resides in the renormalizability which is preserved by the Higgs mechanism. 5 The Higgs Boson at the LHC In the Standard Model, one weak isospin Higgs doublet is introduced leading to the existence of one elementary Higgs boson after electroweak symmetry breaking. The only unkown parameter in this model is the mass mH of the Higgs boson itself. All production and decay properties of the Higgs boson are fixed with its mass [13].

L After spontaneous symmetry breaking and the substitution φ= 0 1 , 2 v + h(x) this reduces to L3 = −me ee − me eeh. v The electron mass became Ge v me = √ . 2 Besides the mass term, this Lagrangian contains a term coupling the electron to the Higgs scalar which is very small and does not produce any detectable effect. Heavier fermions like top quarks have a much stronger coupling to the Higgs field since the coupling is proportional to the fermion masses. The value Ge is arbitrary, thus the mass me cannot be predicted.

At the time of writing of this thesis, CMSSW was not yet in a reliable state of stability and simulated data were not available. Therefore the ttH analysis in Chapter 5 is carried out in the old software framework and no further discussion of CMSSW is given here. 1 Simulation and Digitization The full CMS detector simulation package is named OSCAR (“Object oriented Simulation for CMS Analysis and Reconstruction”). It is based on the COBRA framework. OSCAR employs the GEANT4 toolkit [42] for the simulation of all the CMS detector components.

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Search for H → b¯b in Association with a t¯t Pair in Proton-Proton Collisions at squre root of s =14 TeV by Schmidt A.

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