Jet vetoing and Herwig++
Alex Schofield, Michael H. Seymour (University of Manchester)
TL;DR
This paper analyzes and improves the Herwig++ simulation of jet gap events by identifying and correcting unphysical behaviors in the parton shower's treatment of wide-angle gluon emissions.
Contribution
It introduces a modified parton shower algorithm that corrects unphysical behaviors in simulating QCD radiation with jet vetoes in Herwig++.
Findings
Unphysical behavior identified in current Herwig++ simulations.
Modified shower algorithm improves the physical accuracy of jet gap event simulations.
Enhanced agreement with analytical calculations of QCD radiation.
Abstract
We investigate the simulation of events with gaps between jets with a veto on additional radiation in the gap in Herwig++. We discover that the currently-used random treatment of radiation in the parton shower is generating some unphysical behaviour for wide-angle gluon emission in QCD 2 to 2 scatterings. We explore this behaviour quantitatively by making the same assumptions as the parton shower in the analytical calculation. We then modify the parton shower algorithm in order to correct the simulation of QCD radiation.
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