# The LFU ratio R π in the Standard Model and beyond.

@article{Bordone2021TheLR,
title={The LFU ratio R $\pi$ in the Standard Model and beyond.},
author={Marzia Bordone and Claudia Cornella and Gino Isidori and Matthias K{\"o}nig},
journal={The European physical journal. C, Particles and fields},
year={2021},
volume={81 9},
pages={
850
}
}
• Published 27 January 2021
• Physics
• The European physical journal. C, Particles and fields
We discuss the possibility of performing precise tests of μ / e universality in B → π ℓ + ℓ - decays. We show that in wide regions of the dilepton invariant mass spectrum the ratio between muonic and electronic decay widths can be predicted with high accuracy, both within and beyond the Standard Model. We present numerical expressions which can be used to extract precise information on short-distance dynamics if a deviation from universality is observed in the data.
1 Citations
• Physics
Journal of High Energy Physics
• 2023
The B → Kℓ+ℓ− system is particularly interesting to explore physics beyond the Standard Model. Such effects could provide new sources of CP violation, thereby giving rise to Wilson coefficients which

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