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The LFU Ratio R_π in the Standard Model and Beyond
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The LFU Ratio $R_\pi$ in the Standard Model and Beyond
abstract
We discuss the possibility of performing precise tests of $\mu/e$ universality in $B \to\pi \ell^+\ell^-$ 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.
Forward citations
Cited by 2 Pith papers
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First evidence of the decay $B^+\to\pi^+ e^+ e^-$
First evidence of B⁺→π⁺e⁺e⁻ decay at 3.2σ significance with branching fraction (2.4 +0.9-0.8 +0.4-0.2)×10^{-8} consistent with SM prediction.
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First evidence of the decay $B^+\to\pi^+ e^+ e^-$
LHCb observes 3.2 sigma evidence for B+ -> pi+ e+ e- with measured branching fraction (2.4 +0.9 -0.8 +0.4 -0.2) x 10^-8, consistent with Standard Model.
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