Two-loop contributions to the anomalous correlation function 〈Jμ(x)Jν(y)Jρ(z)〉 of three chiral currents are calculated by a method based on the conformal properties of massless field theories. The method was previously applied to virtual photon diagrams in quantum electrodynamics, and it is extended here to diagrams with scalars and chiral spinors in the abelian Higgs model and in the SU(3) × S...

We present the two-loop QED and QCD corrections to the f f̄H Yukawa coupling that are induced by the exchange of a virtual photon or gluon, respectively, with a heavy-fermion loop inserted. As an application, we study the corresponding O(αsM H/mt ) correction to the H → bb̄ decay rate. A Higgs boson with MH ∼< 135 GeV decays dominantly to bb̄ pairs [1]. This decay mode will be of prime importance ...

We present an extension of the duality theorem, previously defined by S. Catani et al on the one–loop level, to higher loop orders. The duality theorem provides a relation between loop integrals and tree–level phase–space integrals. Here, the one–loop relation is rederived in a way which is more suitable for its extension to higher loop orders. This is shown in detail by considering the two–loo...

The diffusion of carsharing in cities can potentially support the transition towards a sustainable mobility system and help build circular economy. Since urban transportation is complex due to involvement various stakeholders, including travelers, suppliers, manufacturers, government, holistic approach based on systems thinking essential capture this complexity its causalities. In regard, curre...

Polarity and causality are important concepts but have not received much attention in the system dynamics literature. The great effort it takes students to properly understand them has motivated this inquiry. In the framework of a conceptual model of interacting with complex systems, several cognitive tasks are proposed. This paper concentrates on one of them that deals with causal links’ polar...