Effective field theory in the top sector: do multijets help?

Englert, C. , Russell, M. and White, C. D. (2019) Effective field theory in the top sector: do multijets help? Physical Review D, 99, 035019. (doi: 10.1103/PhysRevD.99.035019)

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Many studies of possible new physics employ effective field theory (EFT), whereby corrections to the Standard Model take the form of higher-dimensional operators, suppressed by a large energy scale. Fits of such a theory to data typically use parton-level observables, which limits the data sets one can use. In order to theoretically model search channels involving many additional jets, it is important to include tree-level matrix elements matched to a parton shower algorithm, and a suitable matching procedure to remove the double counting of additional radiation. There are then two potential problems: (i) EFT corrections are absent in the shower, leading to an extra source of discontinuities in the matching procedure; (ii) the uncertainty in the matching procedure may be such that no additional constraints are obtained from observables sensitive to radiation. In this paper, we review why the first of these is not a problem in practice and perform a detailed study of the second. In particular, we quantify the additional constraints on EFT expected from top pair plus multijet events, relative to inclusive top pair production alone.

Item Type:Articles
Glasgow Author(s) Enlighten ID:White, Dr Christopher and Englert, Professor Christoph
Authors: Englert, C., Russell, M., and White, C. D.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review D
Publisher:American Physical Society
ISSN (Online):1550-2368
Copyright Holders:Copyright © 2019 American Physical Society
First Published:First published in Physical Review D 99:035019
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
729782Phenomenology from Lattice QCD and Collider PhysicsChristine DaviesScience & Technology Facilities Council (STFC)ST/P000746/1S&E P&A - PHYSICS & ASTRONOMY