We shall not, however, concern ourselves with the neutrino sector. We do not understand why quarks and leptons look so different, in particular, why neutrinos are rather close to being massless, but then have (at least two) near maximal mixing angles. ), yet the third-generation top quark is a v. We do not understand why most fermions are so light on the weak symmetry breaking scale (v. But then the CP violation with three generations fall far short of what is needed to generate the baryon asymmetry of the Universe. We do not understand why there are only three generations, but Nature insists on (just about) only three active neutrinos. That three generations are needed to have CP violation is a partial answer. We do not understand why there is “family” (or generation) replication. Yet, the question of “Who ordered the muon?” by I. This is especially so on the verge of the LHC era, where the exploration of the physics of electroweak symmetry breaking at the high energy frontier would soon be the main thrust of the ?eld. Yet it tends to be underrated, sometimes even ignored, by the erudite. With no evident symmetry principle behind its existence, it is not as well understood as the SU(3)×SU(2)×U(1) gauge interactions. The ?avor sector carries the largest number of parameters in the Standard Model of particle physics. The results presented are currently the most stringent limits in the MSSM parameter space.ĭownload Flavor Physics and the TeV Scale Book in PDF, Epub and Kindle The sensitivity achieved by this analysis is rooted on the robustness of the description of the different backgrounds and the boldness of the method for tau reconstruction. CDF is one of the detectors built to record and analyze the products of the collisions provided by the Tevatron. This accelerator provides proton-antiproton collisions with a center of mass energy of 1.96 TeV. The analysis presented in this dissertation focuses on the search for neutral MSSM Higgs bosons at the Tevatron, a hadron collider operating at Fermilab, USA. The model with a minimal supersymmetric content in the Higgs sector is know as Minimal Supersymmetric Extension of the Standard Model, MSSM. Supersymmetry is a newer theoretical framework, thought to overcome the problems found with the Standard Model while preserving all its predictive power. Download Probing Higgs Bosons Signatures Book in PDF, Epub and KindleĮven if the Standard Model of particle physics has proven to be one of the most accurate descriptions of nature ever devised by human beings, some limitations point towards the idea that it is a low energy effective theory.
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