The author develops a novel analysis method for QCD sum rules (QCDSR) by applying the maximum entropy method (MEM) to arrive at an analysis with less artificial assumptions than previously held. This is a first-time accomplishment in the field. In this thesis, a reformed MEM for QCDSR is formalized and is applied to the sum rules of several channels: the light-quark meson in the vector channel, the light-quark baryon channel with spin and isospin 1/2, and several quarkonium channels at both zero and finite temperatures. This novel technique of combining QCDSR with MEM is applied to the study of quarkonium in hot matter, which is an important probe of the quark-gluon plasma currently being created in heavy-ion collision experiments at RHIC and LHC.
The author develops a novel analysis method for QCD sum rules (QCDSR) by applying the maximum entropy method (MEM) to arrive at an analysis with less artificial assumptions than previously held. This is a first-time accomplishment in the field. In this thesis, a reformed MEM for QCDSR is formalized and is applied to the sum rules of several channels: the light-quark meson in the vector channel, the light-quark baryon channel with spin and isospin 1/2, and several quarkonium channels at both zero and finite temperatures. This novel technique of combining QCDSR with MEM is applied to the study of quarkonium in hot matter, which is an important probe of the quark-gluon plasma currently being created in heavy-ion collision experiments at RHIC and LHC.
The standard model (SM) of particle physics is a hugely successful theory of nature, but it is incomplete. E.g., it cannot explain finite SM neutrino masses or the origin of the primordial baryon asymmetry (BAU). One way to address such problems is to postulate the existence of new but hidden particles. This thesis studies such "hidden sectors" in two ways: 1) An effective theory approach, where electroweak (EW) and GeV scale portal effective theories (PETs) are constructed that couple the SM to a generic light hidden mediator of spin 0, 1⁄2, or 1. The EW scale PETs include all portal operators of dimension d≤5. The GeV scale PETs additionally include all leading order (LO) flavour changing portal operators of dimension d≤6,7. They are used to derive a LO PET chiral perturbation theory Lagrangian that describes hidden sector induced light meson transitions in fixed target experiments like NA62 or SHiP. 2) An investigation of the type-I seesaw model, which couples the SM to n≥2 sterile neutrinos that can generate a BAU via “leptogenesis”. It is shown that thermal and spectator effects can result in a sign-flip and strong relative enhancement of the BAU in high-scale leptogenesis with two hierarchical sterile neutrinos of vanishing initial abundance. Much lighter sterile neutrinos may be detected via lepton number violating (LNV) decays at colliders, but LNV decays could be suppressed relative to lepton number conserving decays for 't Hooft natural parameter choices. It is shown that the corresponding parameter space consists of three regions: (a)with unsuppressed LNV decays, (b)with suppressed LNV decays, (c)with suppressed and unsuppressed LNV decays.
In today’s world, we cooperate across legal and cultural systems in order to create value. However, this increases volatility, uncertainty, complexity, and ambiguity as challenges for societies, politics, and business. This has made governance a scarce resource. It thus is inevitable that we understand the means of governance available to us and are able to economize on them. Trends like the increasing role of product labels and a certification industry as well as political movements towards nationalism and conservatism may be seen as reaction to disappointments from excessive cooperation. To avoid failures of cooperation, governance is important – control through e.g. contracts is limited and in governance economics trust is widely advertised without much guidance on its preconditions or limits. This book draws on the rich insight from research on trust and control, and accommodates the key results for governance considerations in an institutional economics framework. It provides a view on the limits of cooperation from the required degree of governance, which can be achieved through extrinsic motivation or building on intrinsic motivation. Trust Control Economics thus inform a more realistic expectation about the net value added from cooperation by providing a balanced view including the cost of governance. It then becomes clear how complex cooperation is about ‘governance accretion’ where limited trustworthiness is substituted by control and these control instances need to be governed in turn. Trust, Control, and the Economics of Governance is a highly necessary development of institutional economics to reflect progress made in trust research and is a relevant addition for practitioners to better understand the role of trust in the governance of contemporary cooperation-structures. It will be of interest to researchers, academics, and students in the fields of economics and business management, institutional economics, and business ethics. Note that this work is the first of its kind that explicitly reflects on the societal realities, how these drive the assumption setting process, and how these assumptions influence the theory outcome.
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