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dc.contributor.authorFrixione, Stefano
dc.contributor.authorWebber, Bryan
dc.date.accessioned2022-02-24T16:05:25Z
dc.date.available2022-02-24T16:05:25Z
dc.date.issued2021
dc.date.submitted2021-07-06
dc.identifier.issn1126-6708
dc.identifier.otherjhep11(2021)045
dc.identifier.other17087
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/334419
dc.description.abstractWe discuss how colour flows can be used to simplify the computation of matrix elements, and in the context of parton shower Monte Carlos with accuracy beyond leading-colour. We show that, by systematically employing them, the results for tree-level matrix elements and their soft limits can be given in a closed form that does not require any colour algebra. The colour flows that we define are a natural generalization of those exploited by existing Monte Carlos; we construct their representations in terms of different but conceptually equivalent quantities, namely colour loops and dipole graphs, and examine how these objects may help to extend the accuracy of Monte Carlos through the inclusion of subleading-colour effects. We show how the results that we obtain can be used, with trivial modifications, in the context of QCD+QED simulations, since we are able to put the gluon and photon soft-radiation patterns on the same footing. We also comment on some peculiar properties of gluon-only colour flows, and their relationships with established results in the mathematics of permutations.
dc.languageen
dc.publisherSpringer Science and Business Media LLC
dc.subjectRegular Article - Theoretical Physics
dc.subjectNLO Computations
dc.subjectQCD Phenomenology
dc.titleThe role of colour flows in matrix element computations and Monte Carlo simulations.
dc.typeArticle
dc.date.updated2022-02-24T16:05:24Z
prism.issueIdentifier11
prism.publicationNameJ High Energy Phys
prism.volume2021
dc.identifier.doi10.17863/CAM.81834
dcterms.dateAccepted2021-10-16
rioxxterms.versionofrecord10.1007/JHEP11(2021)045
rioxxterms.versionVoR
rioxxterms.licenseref.urihttp://creativecommons.org/licenses/by/4.0/
dc.contributor.orcidFrixione, Stefano [0000-0003-1869-4381]
dc.contributor.orcidWebber, Bryan [0000-0001-7474-0990]
dc.identifier.eissn1029-8479
dc.publisher.urlhttp://dx.doi.org/10.1007/JHEP11(2021)045
cam.issuedOnline2021-11-08
dc.identifier.arxiv2106.13471


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