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A search for Higgs boson pair production in the $ b\overline{b}b\overline{b} $ final state is carried out with up to 36.1 fb$^{−1}$ of LHC proton-proton collision data collected at $ \sqrt{s}=13 $ TeV with the ATLAS detector in 2015 and 2016. Three benchmark signals are studied: a spin-2 graviton decaying into a Higgs boson pair, a scalar resonance decaying into a Higgs boson pair, and Standard Model non-resonant Higgs boson pair production. [...]

This Letter presents a search for new light resonances decaying to pairs of quarks and produced in association with a high-$p_T$ photon or jet. The dataset consists of proton–proton collisions with an integrated luminosity of 36.1 fb$^{−1}$ at a centre-of-mass energy of $\sqrt{s}=13$ TeV recorded by the ATLAS detector at the Large Hadron Collider. [...]

A search for a narrow scalar resonance decaying into an opposite-sign muon pair produced in events with and without b-tagged jets is presented in this paper. The search uses 36.1 fb$^{−1}$ of $\sqrt{s} =$ 13 TeV proton-proton collision data recorded by the ATLAS experiment at the LHC. [...]

We study the accuracy and predictive power of conformal perturbation theory by a comparison with lattice results in the neighborhood of the finite-temperature deconfinement transition of SU(2) Yang-Mills theory, assuming that the infrared properties of this non-Abelian gauge theory near criticality can be described by the Ising model. The results of this comparison show that conformal perturbation theory yields quantitatively accurate predictions in a broad temperature range [...]

The extreme electromagnetic fields sustained by plasma-based accelerators could drastically reduce the size and cost of future accelerator facilities. However, they are also an inherent source of correlated energy spread in the produced beams, which severely limits the usability of these devices. [...]

The International Linear Collider (ILC) is a planned electron-positron collider with a first stage at a center-of-mass energy of 250 GeV. The electron beam will be polarized to 80% and the positron beam to 30%. [...]

Plasma wakefields are a promising approach for the acceleration of electrons with ultrahigh (10 to 100 GV/m) electric fields. Nowadays, high-intensity laser pulses are routinely utilized to excite these large-amplitude plasma waves. [...]

In this thesis we discuss modern mathematical tools for the perturbative analysis of supersymmetric Yang–Mills theories (abbreviated SYM). We apply contemporary and traditional computational techniques to two kind of problems. [...]

The search for physics beyond the standard model of particle physics that canexplain the unsolved mysteries of the universe, such as the matter-antimatter asymmetry,is of high importance in todays research. The interaction of quarks with theHiggs boson is a candidate for such physics, possibly resulting in a new source ofCP-violation. [...]

A search for a heavy neutral Higgs boson as postulated by the Minimal Supersymmetric StandardModel is performed. The data used in the search was taken by the CMS experiment atthe LHC in 2016 at a center-of-mass energy of 13 TeV and amounts to an integrated luminosityof 36.3fb$^{-1}$1. [...]