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Title: Convolved substructure: analytically decorrelating jet substructure observables

Abstract

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.

Authors:
 [1];  [2];  [3]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
OSTI Identifier:
1485093
Grant/Contract Number:  
AC02-05CH11231; FG02-05ER41360; SC0011090; AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2018; Journal Issue: 5; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Jets QCD; Phenomenology

Citation Formats

Moult, Ian, Nachman, Benjamin, and Neill, Duff. Convolved substructure: analytically decorrelating jet substructure observables. United States: N. p., 2018. Web. doi:10.1007/jhep05(2018)002.
Moult, Ian, Nachman, Benjamin, & Neill, Duff. Convolved substructure: analytically decorrelating jet substructure observables. United States. doi:10.1007/jhep05(2018)002.
Moult, Ian, Nachman, Benjamin, and Neill, Duff. Wed . "Convolved substructure: analytically decorrelating jet substructure observables". United States. doi:10.1007/jhep05(2018)002. https://www.osti.gov/servlets/purl/1485093.
@article{osti_1485093,
title = {Convolved substructure: analytically decorrelating jet substructure observables},
author = {Moult, Ian and Nachman, Benjamin and Neill, Duff},
abstractNote = {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 D2 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 D2 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.},
doi = {10.1007/jhep05(2018)002},
journal = {Journal of High Energy Physics (Online)},
number = 5,
volume = 2018,
place = {United States},
year = {2018},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 10 works
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Figures / Tables:

Figure 1 Figure 1: The evolution of a two-prong observable, taken here to be D2, with the jet mass is governed by the corresponding evolution of its perturbative and non-perturbative components. Here FNP(ϵ;m) encodes the effects of hadronization, while FP(ϵ;m1;m2) is a perturbatively calculable function describing the mapping between the perturbative distributionsmore » at the masses m1 and m2 (They are technically defined as convolutions in ϵ as described in the text, which has been suppressed in the figure.). By combining these mappings we can completely decorrelate the observable by mapping it to a reference mass value.« less

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