PoS - Proceedings of Science
Volume 414 - 41st International Conference on High Energy physics (ICHEP2022) - Quark and Lepton Flavour Physics
Probing CP violation in semi-leptonic decays through time-evolution
M.R. Novoa Brunet
Full text: pdf
Pre-published on: January 09, 2023
Published on: June 15, 2023
We discuss the role of time-dependent observables in probing CP-violation in $b\to s \ell^+\ell^-$ and $b\to s \nu\bar\nu$ decays. We identify a set of new observables by looking at the time evolution of the differential decay rate of $B_d\to K_S\ell^+\ell^-$ and $B_d\to K_S\nu\bar\nu$ where the interference of $B_{d}-\bar{B}_{d}$ meson mixing and decay is probed. We show that these observables do not require a time-dependent analysis but could be obtained by time-integrated or time-asymmetries if flavour tagging is available.
These observables are precisely predicted in the SM, are unaffected by NP in models with real contributions to SM and chirally flipped operators, are independent of form factors, and are unaffected by hadronic uncertainties. They are however sensitive probes of NP scenarios involving new CP-odd phases.
DOI: https://doi.org/10.22323/1.414.0754
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