• Open Access

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

Christoph Englert, Michael Russell, and Chris D. White
Phys. Rev. D 99, 035019 – Published 15 February 2019

Abstract

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.

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  • Received 11 October 2018

DOI:https://doi.org/10.1103/PhysRevD.99.035019

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

  1. Physical Systems
Particles & Fields

Authors & Affiliations

Christoph Englert1,*, Michael Russell2,†, and Chris D. White3,‡

  • 1SUPA, School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
  • 2Institut für Theoretische Physik, Universität Heidelberg, Heidelberg 69120, Germany
  • 3Centre for Research in String Theory, School of Physics and Astronomy, Queen Mary University of London, 327 Mile End Road, London E1 4NS, United Kingdom

  • *christoph.englert@glasgow.ac.uk
  • russell@thphys.uni-heidelberg.de
  • christopher.white@qmul.ac.uk

Article Text

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Issue

Vol. 99, Iss. 3 — 1 February 2019

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