Titel
Improvements on dipole shower colour
Autor*in
Jack Holguin
Consortium for Fundamental Physics, School of Physics & Astronomy, University of Manchester
Jeffrey R. Forshaw
Consortium for Fundamental Physics, School of Physics & Astronomy, University of Manchester
Abstract
The dipole formalism provides a powerful framework from which parton showers can be constructed. In a recent paper (Forshaw et al. 2020), we proposed a dipole shower with improved colour accuracy and in this paper we show how it can be further improved. After an explicit check at O(α2s) we confirm that our original shower performs as it was designed to, i.e. inheriting its handling of angular-ordered radiation from a coherent branching algorithm. We also show how other dipole shower algorithms fail to achieve this. Nevertheless, there is an O(α2s) topology where it differs at sub-leading Nc from a coherent branching algorithm. This erroneous topology can contribute a leading logarithm to some observables and corresponds to emissions that are ordered in kt but not angle. We propose a simple, computationally efficient way to correct this and assign colour factors in accordance with the coherence properties of QCD to all orders in αs.
Stichwort
Physics and Astronomy (miscellaneous)Engineering (miscellaneous)
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
Erschienen in
Titel
The European Physical Journal C
Band
81
Ausgabe
4
ISSN
1434-6044
Erscheinungsdatum
2021
Publication
Springer Science and Business Media LLC
Erscheinungsdatum
2021
Zugänglichkeit
Rechte
Rechteangabe
© The Author(s) 2021
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