Описание: This doctoral thesis focuses on the search for new phenomena in top-antitop quark (tt) final states with additional b-quark jets at the LHC. It uses the full Run 1 dataset collected by the ATLAS experiment in proton-proton collisions at ?s=8 TeV. The final state of interest consists of an isolated lepton, a neutrino and at least six jets with at least four b-tagged jets, a challenging experimental signature owing to the large background from tt+heavy-flavor production. This final state is characteristic of ttH production, with the Higgs boson decaying into bb, a process that allows direct probing of the top-Higgs Yukawa coupling. This signature is also present in many extensions of the Standard Model that have been proposed as solutions to the hierarchy problem, such as supersymmetry or composite Higgs models, which predict the pair production of bosonic or fermionic top quark partners, or the anomalous production of four-top-quark events. All these physics processes have been searched for using an ambitious search strategy that has been developed on the basis of a combination of state-of-art theoretical predictions and a sophisticated statistical analysis to constrain in-situ the large background uncertainties. As a result, the most restrictive bounds to date on the above physics processes have been obtained.
Автор: Kiran Joshi Название: QCD Radiation in Top-Antitop and Z+Jets Final States ISBN: 3319196529 ISBN-13(EAN): 9783319196527 Издательство: Springer Рейтинг: Цена: 15672.00 р. Наличие на складе: Есть у поставщика Поставка под заказ.
Описание: This thesis contains new research in both experimental and theoretical particle physics, making important contributions in each. As the first observation of VBF at a hadron collider, this measurement demonstrated new techniques to reliably extract VBF processes and paved the way for future VBF Higgs measurements.
Описание: This book mainly focuses on the study of photon + 3 jets final state in Proton-Proton Collisions at ГЇВїВЅ s = 7TeV, searching for patterns of two (or more) distinct hard scatterings in the same collision, i.e the so-called Double Parton Scattering (DPS).
Автор: Hermann-Josef R?ser; Klaus Meisenheimer Название: Jets in Extragalactic Radio Sources ISBN: 3662139502 ISBN-13(EAN): 9783662139509 Издательство: Springer Рейтинг: Цена: 15672.00 р. Наличие на складе: Есть у поставщика Поставка под заказ.
Описание: The existence of jets emanating from the central sources ofradio galaxies and quasars was perhaps the most importantdiscovery for our understanding of the nature of activegalactic nuclei.
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