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The impact of flavour data on global fits of the MFV SMEFT

  • Regular Article - Theoretical Physics
  • Open access
  • Published: 17 December 2020
  • Volume 2020, article number 113, (2020)
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Journal of High Energy Physics Aims and scope Submit manuscript
The impact of flavour data on global fits of the MFV SMEFT
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  • Rafael Aoude  ORCID: orcid.org/0000-0001-9259-92571,
  • Tobias Hurth1,
  • Sophie Renner2 &
  • …
  • William Shepherd3 
  • 528 Accesses

  • 45 Citations

  • 1 Altmetric

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A preprint version of the article is available at arXiv.

Abstract

We investigate the information that can be gained by including flavour data in fits of the Standard Model Effective Field Theory (SMEFT) with the assumption of Minimal Flavour Violation (MFV), allowing — as initial conditions at the high scale — leading terms in spurionic Yukawas only. Starting therefore from a theory with no tree level flavour changing neutral currents at the scale of new physics, we calculate effects in flavour changing processes at one loop, and the resulting constraints on linear combinations of SMEFT coefficients, consistently parameterising the electroweak parameters and the CKM within the SMEFT. By doing a global fit including electroweak, Higgs and low energy precision measurements among others, we show that flavour observables put strong constraints on previously unconstrained operator directions. The addition of flavour data produces four independent constraints at order TeV or above on otherwise flat directions; reducing to three when complete U(3)5 flavour symmetry is assumed. Our findings demonstrate that flavour remains a stringent test for models of new physics, even in the most flavourless scenario.

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Authors and Affiliations

  1. PRISMA+ Cluster of Excellence & Mainz Institute of Theoretical Physics, Johannes Gutenberg-Universität Mainz, 55099, Mainz, Germany

    Rafael Aoude & Tobias Hurth

  2. SISSA International School for Advanced Studies, Via Bonomea 265, 34136, Trieste, Italy

    Sophie Renner

  3. Physics Department, Sam Houston State University, Huntsville, TX, 77431, USA

    William Shepherd

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  1. Rafael Aoude
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  2. Tobias Hurth
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  3. Sophie Renner
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  4. William Shepherd
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Correspondence to Rafael Aoude.

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Aoude, R., Hurth, T., Renner, S. et al. The impact of flavour data on global fits of the MFV SMEFT. J. High Energ. Phys. 2020, 113 (2020). https://doi.org/10.1007/JHEP12(2020)113

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  • Received: 19 March 2020

  • Revised: 17 September 2020

  • Accepted: 06 November 2020

  • Published: 17 December 2020

  • DOI: https://doi.org/10.1007/JHEP12(2020)113

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Keywords

  • Beyond Standard Model
  • Effective Field Theories
  • Heavy Quark Physics
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