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QCD improved matching for semileptonic B decays with leptoquarks


Aebischer, Jason; Crivellin, Andreas; Greub, Christoph (2019). QCD improved matching for semileptonic B decays with leptoquarks. Physical review D, 99(5):055002.

Abstract

Leptoquarks (LQs) provide very promising solutions to the tensions between the experimental measurements and the SM predictions of b→sℓ+ℓ− and b→cτν processes. In this case the LQ masses are in general at the TeV scale and they can thus be produced at high energy colliders and dedicated LHC searches are ongoing. While for LQ production and decay the O(αs) corrections have been known for a long time, the O(αs) corrections to the matching on 2-quark-2-lepton operators have not been calculated, yet. In this article we close this gap by computing the QCD corrections to the matching of LQ models on the effective SM Lagrangian for both scalar and vector LQs. We find an enhancement of the Wilson coefficients of vector operators with respect to the tree-level results of around 8% (13%) if they originate from scalar (vector) LQs. This softens the LHC bounds and increases the allowed parameter space of LQ models addressing the flavor anomalies.

Abstract

Leptoquarks (LQs) provide very promising solutions to the tensions between the experimental measurements and the SM predictions of b→sℓ+ℓ− and b→cτν processes. In this case the LQ masses are in general at the TeV scale and they can thus be produced at high energy colliders and dedicated LHC searches are ongoing. While for LQ production and decay the O(αs) corrections have been known for a long time, the O(αs) corrections to the matching on 2-quark-2-lepton operators have not been calculated, yet. In this article we close this gap by computing the QCD corrections to the matching of LQ models on the effective SM Lagrangian for both scalar and vector LQs. We find an enhancement of the Wilson coefficients of vector operators with respect to the tree-level results of around 8% (13%) if they originate from scalar (vector) LQs. This softens the LHC bounds and increases the allowed parameter space of LQ models addressing the flavor anomalies.

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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)
Language:English
Date:8 March 2019
Deposited On:12 Sep 2019 11:09
Last Modified:16 Feb 2020 07:04
Publisher:American Physical Society
ISSN:2470-0010
OA Status:Green
Publisher DOI:https://doi.org/10.1103/physrevd.99.055002
Project Information:
  • : FunderSNSF
  • : Grant IDPZ00P2_154834
  • : Project TitleFlavour Physics beyond the Standard Model

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