Physics software gets upgrade to handle extreme particle collisions
Researchers have refined the computer models that predict outcomes of high-energy particle collisions, making them more accurate at extreme energies where weak nuclear forces matter. The improvement automates calculations for thousands of physics scenarios, potentially accelerating discoveries at major research facilities and strengthening the tools used to test fundamental physics theories.
Originaltitel: Improving NLO QCD event generators with high-energy EW corrections
<p>In this work we present a new method for the combination of electroweak (EW) corrections at high energies, the so-called EW Sudakov logarithms (EWSL), and next-to-leading-order QCD predictions matched to parton-shower simulations (NLO+PS). Our approach is based on a reweighting procedure of NLO+PS events. In particular, both events with and without an extra hard emission from matrix elements are consistently reweighted via the inclusion of the corresponding EWSL contribution. We describe the technical details and the implementation in the MadGraph5_aMC@NLO framework. Via a completely automated procedure, events at this level of accuracy can be obtained for a vast class of hadroproduction processes. As a byproduct we provide results for phenomenologically relevant physical distributions from top-quark pair and Higgs boson associated production (t¯tH) and from the associated production of three <em>Z</em> gauge bosons (<em>ZZZ</em>).</p>