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Effective theory for a heavy scalar coupled to the SM via vector-like quarks


Alte, Stefan; König, Matthias; Neubert, Matthias (2019). Effective theory for a heavy scalar coupled to the SM via vector-like quarks. European Physical Journal C - Particles and Fields, 79(4):352.

Abstract

We illustrate the application of the recently developed SCETBSM framework in the context of a specific model, in which the Standard Model (SM) is supplemented by a heavy scalar S and three generations of heavy, vector-like quarks Ψ. We construct the appropriate effective field theory for two-body decays of S into SM particles. We explicitly compute the Wilson coefficients of the SCETBSM operators appearing at leading and next-to-leading order (NLO) in an expansion in powers of v/MS, as well as for a subset of operators arising at NNLO, retaining the full dependence on the ratio MS/MΨ. For the phenomenologically most relevant decay channels of the heavy scalar, we study the impact of resummation effects of Sudakov logarithms on the decay rates.

Abstract

We illustrate the application of the recently developed SCETBSM framework in the context of a specific model, in which the Standard Model (SM) is supplemented by a heavy scalar S and three generations of heavy, vector-like quarks Ψ. We construct the appropriate effective field theory for two-body decays of S into SM particles. We explicitly compute the Wilson coefficients of the SCETBSM operators appearing at leading and next-to-leading order (NLO) in an expansion in powers of v/MS, as well as for a subset of operators arising at NNLO, retaining the full dependence on the ratio MS/MΨ. For the phenomenologically most relevant decay channels of the heavy scalar, we study the impact of resummation effects of Sudakov logarithms on the decay rates.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Uncontrolled Keywords:Physics and Astronomy (miscellaneous), Engineering (miscellaneous)
Language:English
Date:1 April 2019
Deposited On:15 Aug 2019 14:42
Last Modified:25 Sep 2019 00:40
Publisher:Springer
ISSN:1434-6044
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1140/epjc/s10052-019-6867-4

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