Search

Precision measurements of the Higgs boson's properties are a powerful tool to look for deviations from the predictions of the Standard Model (SM) of particle physics. The 139/fb of proton-proton collision data which have been collected by the ATLAS experiment during Run 2 of the LHC, offer an opportunity to investigate rare Higgs-boson topologies, which are particularly sensitive to new physics scenarios but experimentally difficult to access. Several such measurements, which target Higgs-boson decays to heavy-flavour quarks, as well as their combinations are presented in this thesis. A novel analysis that measures Higgs-boson production in association with a heavy vector boson V (VH, with V=W,Z) at high energies is presented. Dedicated Higgs-boson reconstruction techniques are applied to reconstruct the highly Lorentz-boosted Higgs-boson decays into pairs of bottom quarks. The measurement is subsequently combined with a VH cross-section measurement at low and intermediate pT(V) to provide a differential cross-section measurement in kinematic fiducial volumes over the largest possible pT(V) range. All cross-section measurements agree with the SM predictions within relative uncertainties that range from 30% to 300%. The results are furthermore interpreted as limits on the parameters of a SM effective field theory. Finally, a combination of measurements of Higgs decays to heavy-flavour quarks is used to experimentally determine that the Higgs-boson coupling to charm quarks is weaker than to bottom quarks, as predicted by the SM. The target audience for the thesis are physicists and physics students, in particular those with a background in high energy physics.

This book contains the Proceedings of the Seventh Meeting on CPT and Lorentz Symmetry, held at Indiana University in Bloomington on June 20-24, 2016. The meeting focused on tests of these fundamental symmetries and on related theoretical issues, including scenarios for possible violations.Topics covered at the meeting include experimental and observational searches for CPT and Lorentz violation involving: accelerator and collider experiments; astrophysical birefringence, dispersion, and anisotropy; atomic and molecular spectroscopy; clock-comparison measurements; CMB polarization; decays of atoms, nuclei, and particles; equivalence-principle tests with matter and antimatter; exotic atoms, muonium, positronium; gauge and Higgs particles; gravimetry; gravitational waves; high-energy astrophysical observations; hydrogen and antihydrogen; matter interferometry; neutrino oscillations and propagation, neutrino-antineutrino mixing; oscillations and decays of K, B, D mesons; particle-antiparticle comparisons; post-Newtonian gravity in the solar system and beyond; resonant cavities lasers; second and third-generation particles; sidereal and annual time variations, compass asymmetries; space-based missions; spin-polarized matter; spin precession; tests of short-range gravity; and time-of-flight measurements. Theoretical and phenomenological discussions include: physical effects at the level of the Standard Model, General Relativity, and beyond; origins and mechanisms for violations; classical and quantum field theory, gravitation, particle physics, and strings; mathematical foundations; and Finsler geometry.

Chapter 1 - Introduction to Electrostatics Chapter 2 - Fundamental Concepts in Electrostatics Chapter 3 - Poisson's Equation and Laplace's Equation Chapter 4 - Electrostatic Generator and Induction Chapter 5 - Static Electricity Chapter 6 - Electrostatic Discharge Chapter 7 - Classical Electromagnetism Chapter 8 - Lorentz Force Chapter 9 - Lepton Chapter 10 - Antiparticle Chapter 11 - Electromotive Force Chapter 12 - Positronium Chapter 13 - Quantum Electrodynamics Chapter 14 - Waveguide (Electromagnetism)

Chapter 1 - Magnetic Monopole Chapter 2 - Axion Chapter 3 - Goldstone Boson Chapter 4 - Supersymmetric Quantum Mechanics Chapter 5 - Neutralino Chapter 6 - Supermanifold Chapter 7 - Weakly Interacting Massive Particles Chapter 8 - Tachyon Chapter 9 - Higgs Boson Chapter 10 - W'and Z'Bosons & X and Y Bosons Chapter 11 - An Exceptionally Simple Theory of Everything Chapter 12 - Faster-Than-Light Chapter 13 - Mirror Matter