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 - particles, fields, gravitation, and cosmology, 99(5) American Physical Society 10.1103/PhysRevD.99.055002

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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(as) corrections have been known for a long time, the O(as) 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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Aebischer, Jason; Crivellin, Andreas and Greub, Christoph

Subjects:

500 Science > 530 Physics

ISSN:

1550-7998

Publisher:

American Physical Society

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

14 May 2019 14:28

Last Modified:

24 Oct 2019 09:13

Publisher DOI:

10.1103/PhysRevD.99.055002

ArXiv ID:

1811.08907

BORIS DOI:

10.7892/boris.127983

URI:

https://boris.unibe.ch/id/eprint/127983

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