PoS - Proceedings of Science
Volume 445 - 21st Conference on Flavor Physics and CP Violation (FPCP2023) - Rare decays of hadrons and leptons
Status of the global $b\to s\ell^+\ell^-$ fits
B. Capdevila
Full text: pdf
Pre-published on: October 31, 2023
Published on: November 14, 2023
The exploration of rare neutral current $b\to s\ell^+\ell^-$ transitions is pivotal in testing the Standard Model (SM) and probing the presence of New Physics (NP) phenomena. This proceedings article offers an overview of recent developments in the examination of anomalies, deviations from SM predictions, in semi-leptonic $B$ meson decays. It encompasses both experimental and theoretical aspects within the domain of global analyses of $b\to s\ell^+\ell^-$ observables. We start by reviewing the current status of the experimental measurements for the key observables that define the decay modes included in global analyses. Subsequently, we delve into the determination of non-perturbative contributions, crucial for the computation of the amplitudes of the various $b\to s\ell^+\ell^-$ modes. Our focus extends to recent advancements in local and non-local form factor calculations and their implications for SM predictions. This sets the stage for a detailed exploration of the outcomes from recent global analyses in the context of one-dimensional (1D) and two-dimensional (2D) fits. We underscore the importance of lepton flavour universality (LFU) throughout this discussion. Furthermore, we explore the interconnections between the tensions in $b\to s\ell^+\ell^-$ data and the anomalies in charged current $b\to c\ell\nu$ transitions, most notably in the $R(D)$ and $R(D^*)$ ratios. Lastly, we comment on the enhancement of $b\to s\tau^+\tau^-$ processes that follows from general NP explanations of the $R(D)$ and $R(D^*)$ anomalies within the Standard Model Effective Theory (SMEFT), under current constraints.
DOI: https://doi.org/10.22323/1.445.0010
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