So far the appearance of super-leading logarithms in hadron-hadron collisions was only studied for massless states. We extend the formalism to include massive final states and derive the anomalous dimension. We find the presence of an additional phase and discuss its physical significance and the difference to the massless case.
We investigate the effects of a new source of Super-Leading Logarithms in $t \bar{t}$-production at hadron colliders. We show how large logarithms arise from an additional imaginary contribution to the anomalous dimension associated with massive final states, and discuss their resummation. We analyze the numerical impact in partonic scattering processes and examine the behavior near threshold.
Recent measurements at the Large Hadron Collider have observed entanglement in the spins of $t\bar{t}$ pairs. The effects of radiation, which are expected to lead to quantum decoherence and a reduction of entanglement, are generally neglected in such measurements. In this work we calculate the effects of decoherence from various different types of radiation for a maximally entangled pair of...
The production of four top quarks is one of the rarest processes in the Standard Model, and it was finally observed in 2023 at the LHC. Studying this process offers valuable insights into the top-Higgs interaction and may reveal new physics. Thus, comparing theoretical predictions with current and future measurements is a crucial test for the Standard Model.
In this talk, I will present the...
In the study of the Drell-Yan process with LO decay into leptons, the cross-section allows for an angular decomposition in terms of spherical harmonics in the Collins-Soper frame. This decomposition is particularly useful for fitting the experimental data to obtain measurements for each individual angular coefficient. These coefficients can then be used to extract physical observables, one of...
In this work, we have computed the planar and non-planar contributions to the Møller scattering with three massive $Z$ bosons exchanged between the fermion lines. These cases involve complicated geometries like curves of genus $2$ and $K3$ surfaces, which until recently remained inaccessible. We demonstrate how these can be tamed with a newly developed technique for $\varepsilon$-factorization...
In this talk I will discuss differential theoretical predictions for Higgs-boson production in weak-boson fusion and its subsequent decay $H\to b\bar{b}$.
The distinct kinematics of weak-boson fusion allow us to suppress QCD backgrounds by imposing appropriate event selection criteria. However, it was recently observed that in fixed-order calculations these strict event selection criteria...
In the alignment limit of extended Higgs sectors the couplings of one of the neutral Higgs bosons of the model are exactly equal to the couplings of the Higgs boson of the Standard Model at lowest order.
Using the different Yukawa types of a Two-Higgs doublet model as an example and taking into account all relevant experimental and theoretical constraints, it is analysed to what extent the...
We explore the possibility of CP-violation in the complex-singlet extension of 2HDM. The addition of complex singlet paves the way for additional sources of CP-violation compared to 2HDM. If a Z2-symmetry is imposed on the complex-singlet, it can accommodate a dark matter candidate as well. We identify the regions of parameter space, that can fit DM observables and at the same time generate...
The practice of collider physics typically involves the marginalization of multi-dimensional collider data to uni-dimensional observables relevant for some physics task. In any cases, such as classification or anomaly detection, the observable can be arbitrarily complicated, such as the output of a neural network. However, for precision measurements, the observable must correspond to something...
