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Classifying standard model extensions effectively with precision observables

Das Bakshi, Supratim; Chakrabortty, Joydeep; Spannowsky, Michael

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Supratim Das Bakshi

Joydeep Chakrabortty


Effective theories are well established theoretical frameworks to describe the effect of energetically widely separated UV models on observables at lower energy scales. Due to the complexity of the effective theory when taking all the Standard Model symmetries and degrees of freedom into account, tensioning the entire system in a completely agnostic way against experimental measurements results in constraints on the Wilson coefficients of the effective operators that either bears little information or challenge intrinsic assumptions imposed on the effective field theory framework. In general, a specific high-scale extension of the Standard Model only induces a subset of all possible operators. Thus, by investigating which operators are induced by different classes of the Standard Model extensions and comparing to which precision observables they contribute, we show that it is possible to obtain an improved understanding of which UV model is realised in nature. We present the tree + 1 -loop matching results for dimension-6 operators of 15 different BSM scenarios onto SMEFT, and also including, the specific model-based contributions to the observables. We argue that more observables and matching with higher theoretical precision will pave the way to distinguish the single scalar extensions of the SM signatures uniquely. We promote this approach to study new sets of observables in the context of current and near future experiments.


Das Bakshi, S., Chakrabortty, J., & Spannowsky, M. (2021). Classifying standard model extensions effectively with precision observables. Physical Review D, 103(5), Article 056019.

Journal Article Type Article
Acceptance Date Mar 1, 2021
Online Publication Date Mar 23, 2021
Publication Date 2021
Deposit Date Sep 13, 2021
Publicly Available Date Sep 13, 2021
Journal Physical Review D
Print ISSN 2470-0010
Electronic ISSN 2470-0029
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 103
Issue 5
Article Number 056019


Published Journal Article (843 Kb)

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Copyright Statement
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.

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