Logarithmic accuracy of parton showers: a fixed-order study
Journal of High Energy Physics
September 2018, 2018:33 | Cite as
Logarithmic accuracy of parton showers: a fixed-order study
AuthorsAuthors and affiliations
Mrinal DasguptaFrédéric A. DreyerKeith HamiltonPier Francesco MonniGavin P. Salam
Open Access
Regular Article - Theoretical Physics
First Online: 07 September 2018
Received: 05 June 2018
Revised: 14 August 2018
Accepted: 26 August 2018
Abstract
We formulate some first fundamental elements of an approach for assessing the logarithmic accuracy of parton-shower algorithms based on two broad criteria: their ability to reproduce the singularity structure of multi-parton matrix elements, and their ability to reproduce logarithmic resummation results. We illustrate our approach by considering properties of two transverse-momentum ordered final-state showers, examining features up to second order in the strong coupling. In particular we identify regions where they fail to reproduce the known singular limits of matrix elements. The characteristics of the shower that are responsible for this also affect the logarithmic resummation accuracies of the shower, both in terms of leading (double) logarithms at subleading NC and next-to-leading (single) logarithms at leading NC.
Keywords NLO Computations QCD Phenomenology
ArXiv ePrint: 1805.09327
On leave from CNRS, UMR 7589, LPTHE, F-75005, Paris, France and from Rudolf Peierls Centre for Theoretical Physics, 1 Keble Road, Oxford OX1 3NP, U.K. . (Gavin P. Salam)
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Open Access
This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
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