PoS - Proceedings of Science
Volume 414 - 41st International Conference on High Energy physics (ICHEP2022) - Quark and Lepton Flavour Physics
LFU and CP violation in $b \to s \mu \mu$
A. Smolkovic
Full text: pdf
Pre-published on: November 22, 2022
Published on: June 15, 2023
The persistent hints of LFU violation in $b \to s \ell \ell$ may imply an existence of leptoquarks close to the TeV scale that couple to $b \mu$ and $s \mu$. These leptoquark Yukawa couplings can in full generality be complex and thus provide a new source of CP violation. We show that a large CP phase with a definite sign is perfectly viable for an $S_3$ leptoquark of mass below a few TeV, consistent with CP even and CP odd $b \to s \ell \ell$ and $B_s$ mixing observables. Furthermore, we show how the direct CP asymmetries in $B\to K \mu \mu$ are significantly enhanced in the vicinity of narrow charmonia, and that their measurement in the future could provide important additional information in constraining the potentially CP violating NP in $b \to s \ell \ell$.
DOI: https://doi.org/10.22323/1.414.0715
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