Integrating out heavy scalars with modified equations of motion: matching computation of dimension-eight SMEFT coefficients

Banerjee, U., Chakrabortty, J., Englert, C. , Ur Rahaman, S. and Spannowsky, M. (2023) Integrating out heavy scalars with modified equations of motion: matching computation of dimension-eight SMEFT coefficients. Physical Review D, 107(5), 055007. (doi: 10.1103/PhysRevD.107.055007)

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The shift in focus towards searches for physics beyond the Standard Model employing model-independent effective field theory methods necessitates a rigorous approach to matching to guarantee the validity of the obtained results and constraints. The limits on the leading dimension-six effective field theory effects can be rather inaccurate for LHC searches that suffer from large uncertainties while exploring an extensive energy range. Similarly, precise measurements can, in principle, test the subleading effects of the operator expansion. In this work, we present an algorithmic approach to automatize matching computations for dimension-eight operators for generic scalar extensions with proper implementation of equations of motion. We devise a step-by-step procedure to obtain the dimension-eight Wilson coefficients in a nonredundant basis to arrive at complete matching results. We apply this formalism to a range of scalar extensions of the Standard Model and provide tree-level and loop-suppressed results. Finally, we discuss the relevance of the dimension-eight operators for a range of phenomenological analyses, particularly focusing on Higgs and electroweak physics.

Item Type:Articles
Additional Information:The work of U.B., J.C., and S.U.R. is supported by the Science and Engineering Research Board, Government of India, under the agreement SERB/PHY/2019501 (MATRICS). C.E. is supported by the STFC under grant ST/T000945/1, by the Leverhulme Trust under grant RPG-2021-031, and the IPPP Associateship Scheme. M.S. is supported by the STFC under grant ST/P001246/1.
Glasgow Author(s) Enlighten ID:Englert, Professor Christoph
Authors: Banerjee, U., Chakrabortty, J., Englert, C., Ur Rahaman, S., and Spannowsky, M.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Physical Review D
Publisher:American Physical Society
ISSN (Online):2470-0029
Published Online:09 March 2023
Copyright Holders:Copyright © 2023 American Physical Society
First Published:First published in Physical Review D 107(5): 055007
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
306883Research in Particle Physics Theory - Phenomenology from lattice QCD and collider physicsChristine DaviesScience and Technology Facilities Council (STFC)ST/T000945/1P&S - Physics & Astronomy
311961BSM interference effects in Higgs and Top-associated final states.Christoph EnglertLeverhulme Trust (LEVERHUL)RPG-2021-031P&S - Physics & Astronomy