In conventional parton showers, including dipole/antenna ones, a given (Born+𝑚)-parton configuration can typically be reached via (𝑚!) different shower histories. In the context of matrix-element-correction and merging procedures, accounting for these histories mandates fairly complex and resource-intensive algorithms.
A so far little explored alternative in the shower context is to divide...
Standard model four top quark production is a rare process with great potential to reveal new physics. Measurement of the cross section is not only a direct probe of the top quark Yukawa coupling with the Higgs, but an enhancement of this cross section is predicted by several beyond the standard model (BSM) theories. This process is studied in fully-hadronic proton-proton collision events...
The HL-LHC upgrade will require use of new computing resources such as HPCs in their production workflows. Many of the planned HPCs will include significant computing power in the form of accelerators, in particular of Graphic Processing Units (GPUs). To take advantage of these new computing resources ATLAS software and workflows must be adapted to use GPUs. One part of the ATLAS workflow that...