Convolved substructure: analytically decorrelating jet substructure observables

A bstract A number of recent applications of jet substructure, in particular searches for light new particles, require substructure observables that are decorrelated with the jet mass. In this paper we introduce the Convolved SubStructure (CSS) approach, which uses a theoretical understanding of the...

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Bibliographic Details
Published in:The journal of high energy physics 2018-05, Vol.2018 (5), p.1-26, Article 2
Main Authors: Moult, Ian, Nachman, Benjamin, Neill, Duff
Format: Article
Language:English
Subjects:
Classical and Quantum Gravitation
Convolution
Elementary Particles
High energy physics
Jets
Jets QCD
Phenomenology
Physics
Physics and Astronomy
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
QCD Phenomenology
Quantum Field Theories
Quantum Field Theory
Quantum Physics
Regular Article - Theoretical Physics
Relativity Theory
Shape functions
String Theory
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Summary:A bstract A number of recent applications of jet substructure, in particular searches for light new particles, require substructure observables that are decorrelated with the jet mass. In this paper we introduce the Convolved SubStructure (CSS) approach, which uses a theoretical understanding of the observable to decorrelate the complete shape of its distribution. This decorrelation is performed by convolution with a shape function whose parameters and mass dependence are derived analytically. We consider in detail the case of the D 2 observable and perform an illustrative case study using a search for a light hadronically decaying Z ′. We find that the CSS approach completely decorrelates the D 2 observable over a wide range of masses. Our approach highlights the importance of improving the theoretical understanding of jet substructure observables to exploit increasingly subtle features for performance.
ISSN:1029-8479
1029-8479
DOI:10.1007/JHEP05(2018)002