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2021

More Indications for Lepton Nonuniversality in $b \to s \ell^+ \ell^-$

Hurth, T., Mahmoudi, F., Santos, D. Martinez et al.

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Recently the LHCb collaboration has confirmed the evidence for lepton flavour nonuniversality at the $3.1\sigma$ level via an updated measurement of $R_K$.

In this work we analyse this evidence within a model-independent approach.
We make projections for future measurements which indicate that LHCb will be in the position to discover lepton nonuniversality with the Run 3 data in a single observable.
We analyse other ratios based on our analysis of the present measurements of the ratios $R_{K^{(*)}}$ and analyse if they are able to differentiate between various new physics options within the effective field theory at present or in the near future.

More Indications for Lepton Nonuniversality in $b \to s \ell^+ \ell^-$ · Around

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R. Alonso, B. Grinstein and J. Martin Camalich, S U ( 2 ) × U ⁡ ( 1 ) SU(2)\times U(1) gauge invariance and the shape of new physics in rare B B decays Phys. Rev. Lett. 113
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T. Hurth, F. Mahmoudi and S. Neshatpour, Global fits to b → s ℓ ℓ b\to s\ell\ell data and signs for lepton non-universality JHEP 12
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LHCb collaboration, R. Aaij et al., Angular analysis and differential branching fraction of the decay B s 0 → ϕ μ + μ − B^{0}_{s}\to\phi\mu^{+}\mu^{-} , JHEP 09
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Then

T. Hurth, F. Mahmoudi, D. Martinez Santos and S. Neshatpour, Lepton nonuniversality in exclusive b → s ℓ ℓ b{\rightarrow}s{\ell}{\ell} decays , Phys. Rev. D96
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A. Arbey, T. Hurth, F. Mahmoudi and S. Neshatpour, Hadronic and New Physics Contributions to b → s b\to s Transitions , Phys. Rev. D98
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F. Mahmoudi, T. Hurth and S. Neshatpour, Updated fits to the present b → s ℓ + ℓ − b\to s\ell^{+}\ell^{-} data , Acta. Phys. Polon. B 49
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T. Hurth, A. Arbey, F. Mahmoudi and S. Neshatpour, New global fits to b → s b\to s data with all relevant parameters , Nucl. Part. Phys. Proc. 303-305

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