CERN Accelerating science

Article
Title	SMEFT
Related title	CoDEx : BSM physics being realised as an SMEFT
Author(s)	Das Bakshi, Supratim (Indian Inst. Tech., Kanpur) ; Chakrabortty, Joydeep (Indian Inst. Tech., Kanpur) ; Patra, Sunando Kumar (Indian Inst. Tech., Kanpur)
Publication	2019
Imprint	2019-05-13
Number of pages	10
In:	Theory for the FCC-ee : Report on the 11th FCC-ee Workshop Theory and Experiments, pp.221-230
DOI	10.23731/CYRM-2020-003.221
Subject category	Particle Physics - Phenomenology
Study	CERN FCC
Abstract	In spite of the non-observation of any new resonances after the discovery of the Standard Model (SM)-Higgs like particle, which announces the success of the SM, we have enough reason to believe the existence of theories beyond it (BSM), with the SM as a part. As any such theory will affect the electro-weak and the Higgs sector, and the sensitivity of these precision observables are bound to increase in near future, indirect estimation of allowed room left for BSM using Standard Model Effective Field Theory (SMEFT) is well-motivated. Provided that the S-matrix can be expanded perturbatively in the inverse powers of the ultraviolet scale (Λ −1 ), and the resultant series is convergent, we can integrate out heavy degrees of freedom and the higher mass dimensional operators capture their impact through – P i (1/Λ di−4 )CiOi , where di is the operator mass dimension (> 5), and Ci , a function of BSM parameters, is the corresponding Wilson coefficient. Among different choices of operator bases, we restrict ourselves to "SILH" [1, 2] and "Warsaw" [3–6] bases. All WCs are computed at the cut-of scale Λ, usually identified as the mass of the heavy field. The truncation the 1/Λ series depends on the experimental precision of the observables [7]. Already, there have been quite a progress in building packages and libraries in the literature, [8–13].
Copyright/License	preprint: © 2019-2024 Authors (License: CC-BY-4.0) publication: © 2020-2024 CERN (License: CC-BY-4.0)

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