Conveners
Parallel 4
- Thomas Gehrmann (University of Zurich)
Parallel 4
- Thomas Gehrmann (University of Zurich)
We present the calculation of the virtual corrections to $gg \to ZZ$ at next-to-leading order in QCD, focusing on the contribution from top quarks, which lacks a full analytic evaluation. The two-loop box diagrams are computed using a small-tansverse-momentum expansion, and the results are merged with those available in the high-energy expansion, in order to obtain an analytic description in...
We present the first NNLO-accurate event generation for $Z$ boson production in association with a bottom-quark pair. This is achieved by matching the NNLO calculation in the 4FS to a parton shower within the MiNNLO$_\mathrm{PS}$ method, which we extend to accommodate the class of processes with a color singlet and a heavy-quark pair in the final state. We find that NNLO corrections to...
Measurements of W and Z-boson production have reached percent-level precision, imposing challenging demands on theoretical predictions. Such predictions directly limit the precision of measurements like the W-boson mass. We present calculations of W- and Z- boson production at the level of $\alpha_s^3$ at fixed order and including transverse-momentum resummation. We discuss technical and...
We present the first complete QCD corrections to both the inclusive decay width $\Gamma_t$, $W$-helicity fractions and semi-inclusive distributions for the top-quark decay process to the third order in the strong coupling constant $\alpha_s$, accomplished through a very efficient approach readily to be employed in many more related applications. We find, in particular, that the pure...
