An optimal observable for color singlet identification

Buckley, A. , Callea, G. , Larkoski, A. and Marzani, S. (2020) An optimal observable for color singlet identification. SciPost Physics, 9(2), 026. (doi: 10.21468/SciPostPhys.9.2.026)

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We present a novel approach to construct a color tagger, i.e. an observable that is able to discriminate the decay of a color-singlet into two jets from a two-jet background in a different color configuration. We do this by explicitly taking the ratio of the corresponding leading-order matrix elements in the soft limit, thus obtaining an observable that is provably optimal within our approximation. We call this observable the "jet color ring" and we compare its performance to other color-sensitive observables such as jet pull and dipolarity. We also assess the performance of the jet color ring in simulations by applying it to the case of the hadronic decays of a boosted Higgs boson and of an electroweak boson.

Item Type:Articles
Additional Information:The work of SM is supported by Università di Genova under the curiosity-driven grant “Using jets to challenge the Standard Model of particle physics” and by the Italian Ministry of Research (MIUR) under grant PRIN 20172LNEEZ. AB is supported by Royal Society fellowship grant UF160548, and acknowledges research funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Action Innovative Training Networks MCnetITN3 (grant agreement No. 722104). AB and GC have received funding from the UK Science and Technology Facilities Council (STFC) particle physics consolidated grant programme.
Glasgow Author(s) Enlighten ID:Callea, Dr Giuseppe and Buckley, Professor Andy
Authors: Buckley, A., Callea, G., Larkoski, A., and Marzani, S.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:SciPost Physics
ISSN (Online):2542-4653
Copyright Holders:Copyright © A. Buckley et al.
First Published:First published in SciPost Physics 9(2):026
Publisher Policy:Reproduced under a Creative Commons Licence

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
300260New physics studies with heavy flavour at the LHCAndrew BuckleyThe Royal Society (ROYSOC)UF160548P&S - Physics & Astronomy