Navigation auf uzh.ch

Suche

Physik-Institut

Group Grazzini: Wtt production paper

Congratulations: The paper on Wtt production has been published on PRL as Editors’ suggestion!

The production of a top-antitop quark pair in association with a W boson (t¯tW) is one of the heaviest signatures currently probed at the Large Hadron Collider. Since the first observation reported in 2015, the corresponding rates have been found to be consistently higher than the standard model predictions, which are based on next-to-leading order calculations in the QCD and electroweak interactions. The paper present the first next-to-next-to-leading order QCD computation of t¯tW production at hadron colliders.

Wtt production

The calculation is exact, except for the finite part of the two-loop virtual corrections, which is estimated using two different approaches that lead to consistent results within their uncertainties. We combine the newly computed next-to-next-to-leading order QCD corrections with the complete next-to-leading order QCD plus electroweak results, thus obtaining the most advanced perturbative prediction available to date for the t¯tW inclusive cross section. The tension with the latest ATLAS and CMS results remains at the 1σ−2σ level.

Wtt production
Caption:  Comparison of our NNLOQCD+NLOEW result to the measurement performed by the CMS (red) and ATLAS (blue) collaborations in Refs. [10, 11], at 68% (solid) and 95% (dashed) confidence level. We indicate in black and orange the scale and the approximation uncertainties, respectively, of the NNLOQCD+NLOEW result.

Publication
Luca Buonocore, Simone Devoto, Massimiliano Grazzini, Stefan Kallweit, Javier Mazzitelli, Luca Rottoli, and Chiara Savoini
Phys. Rev. Lett. 131, 231901 – Published 5 December 2023

Katharina Mueller