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We calculate the leading electroweak (EW) corrections to the importantprocess of Higgs production associated with two bottom quarks at the CERN LargeHadron Collider (LHC). Our study is restricted to the Standard Model (SM).  At tree-level Higgs production in association with a b-quark pair proceedsthrough the small Yukawa bottom coupling in the Standard Model. Even in thelimit where this coupling vanishes, EW one-loop effects, through the top-HiggsYukawa coupling in particular, can still trigger this reaction. Thiscontribution is small for Higgs masses around 120GeV but it quickly picks upfor higher Higgs masses especially because the one-loop amplitude develops aleading Landau singularity and new thresholds open up. These effects can beviewed as the production of a pair of top quarks which rescatter to give riseto Higgs production through WW fusion. An important part of the thesis isdevoted to the topic of Landau singularities in one-loop Feynman diagrams andapplication to the specific process of bbH production at the LHC.  Since the 4-point leading Landau singularity is not integrable when theone-loop amplitude is squared, we regulate the cross section by taking intoaccount the width of the internal top and W particles. This requires that weextend the usual box one-loop function to the case of complex masses. We showhow this can be implemented analytically in our case.  We study in some detail the cross section at the LHC as a function of theHiggs mass and show how some distributions can be drastically affected comparedto the tree-level result.

One-Loop Yukawa Corrections to the Process pp -> b anti-b H in the Standard Model at the LHC: Landau Singularities