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Effective operator bases for beyond Standard Model scenarios: an EFT compendium for discoveries

Banerjee, Upalaparna and Chakrabortty, Joydeep and Prakash, Suraj and Rahaman, Shakeel Ur and Spannowsky, Michael (2021) 'Effective operator bases for beyond Standard Model scenarios: an EFT compendium for discoveries.', Journal of High Energy Physics, 2021 (1). 028.


It is not only conceivable but likely that the spectrum of physics beyond the Standard Model (SM) is non-degenerate. The lightest non-SM particle may reside close enough to the electroweak scale that it can be kinematically probed at high-energy experiments and on account of this, it must be included as an infrared (IR) degree of freedom (DOF) along with the SM ones. The rest of the non-SM particles are heavy enough to be directly experimentally inaccessible and can be integrated out. Now, to capture the effects of the complete theory, one must take into account the higher dimensional operators constituted of the SM DOFs and the minimal extension. This construction, BSMEFT, is in the same spirit as SMEFT but now with extra IR DOFs. Constructing a BSMEFT is in general the first step after establishing experimental evidence for a new particle. We have investigated three different scenarios where the SM is extended by additional (i) uncolored, (ii) colored particles, and (iii) abelian gauge symmetries. For each such scenario, we have included the most-anticipated and phenomenologically motivated models to demonstrate the concept of BSMEFT. In this paper, we have provided the full EFT Lagrangian for each such model up to mass dimension 6. We have also identified the CP, baryon (B), and lepton (L) number violating effective operators.

Item Type:Article
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Available under License - Creative Commons Attribution 4.0.
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Publisher statement:Open Access, © The Authors. Article funded by SCOAP3 This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.
Date accepted:08 November 2020
Date deposited:08 February 2021
Date of first online publication:07 January 2021
Date first made open access:08 February 2021

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