We study the logarithmic accuracy of angular-ordered parton showers by considering the singular limits of multiple emission matrix elements. This allows us to consider different choices for the evolution variable and propose a new choice which has both the correct logarithmic behaviour and improved performance away from the singular regions. In particular the description of e+e− event shapes in the non-logarithmic region is significantly improved.
Bewick, G., Ferrario Ravasio, S., Richardson, P., Seymour, M. (2020). Logarithmic accuracy of angular-ordered parton showers. JOURNAL OF HIGH ENERGY PHYSICS, 2020(4) [10.1007/JHEP04(2020)019].
Logarithmic accuracy of angular-ordered parton showers
Ferrario Ravasio, S;
2020
Abstract
We study the logarithmic accuracy of angular-ordered parton showers by considering the singular limits of multiple emission matrix elements. This allows us to consider different choices for the evolution variable and propose a new choice which has both the correct logarithmic behaviour and improved performance away from the singular regions. In particular the description of e+e− event shapes in the non-logarithmic region is significantly improved.
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