QCD-aware partonic jet clustering for truth-jet flavour labelling

Buckley, A. and Pollard, C. (2016) QCD-aware partonic jet clustering for truth-jet flavour labelling. European Physical Journal C, 76(2), 71. (doi: 10.1140/epjc/s10052-016-3925-z)

Abstract

We present an algorithm for deriving partonic flavour labels to be applied to truth particle jets in Monte Carlo event simulations. The inputs to this approach are final pre-hadronisation partons, to remove dependence on unphysical details such as the order of matrix element calculation and shower generator frame recoil treatment. These are clustered using standard jet algorithms, modified to restrict the allowed pseudojet combinations to those in which tracked flavour labels are consistent with QCD and QED Feynman rules. The resulting algorithm is shown to be portable between the major families of shower generators, and largely insensitive to many possible systematic variations: it hence offers significant advantages over existing ad hoc labelling schemes. However, it is shown that contamination from multi-parton scattering simulations can disrupt the labelling results. Suggestions are made for further extension to incorporate more detailed QCD splitting function kinematics, robustness improvements, and potential uses for truth-level physics object definitions and tagging.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Pollard, Dr Chris and Buckley, Professor Andy
• Authors: Buckley, A., and Pollard, C.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: European Physical Journal C
• Publisher: Springer
• ISSN: 1434-6044
• ISSN (Online): 1434-6052
• Published Online: 12 February 2016
• Copyright Holders: Copyright © 2016 The Authors
• First Published: First published in European Physical Journal C 76(2): 71
• Publisher Policy: Reproduced under a Creative Commons License