First measurement of time-dependent $CP$ violation in the flavor-changing neutral-current decay $B^0\to K_S^0{\mu }^{+}{\mu }^{-}$

Abstract

A flavor-tagged time-dependent analysis of $B^0\to K_S^0{\mu }^{+}{\mu }^{-}$ decays is performed across the full dimuon mass range excluding the $J/\psi$ and $\psi (2S)$ resonance regions. The analysis uses proton-proton collision data collected by the LHCb experiment in 2011--2018 at center-of-mass energies of 7, 8 and 13TeV, corresponding to an integrated luminosity of 9$f{b}^{-1}$. The CP violation parameters are determined to be $C=-0.13\pm 0.32\pm 0.04$ and $S=+0.82\pm 0.29\pm 0.05$, where the first uncertainties are statistical and the second are systematic. The results are consistent with the Standard Model prediction. This is the first experimental study of time-dependent CP violation in $b\to s{l}^{+}{l}^{-}$ processes.

All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://lbfence.cern.ch/alcm/public/analysis/full-details/3477/ (LHCb public pages)

References in corpus (19)

• PYTHIA 6.4 Physics and Manual
• Performance of the LHCb Vertex Locator
• Measurement of $CP$-averaged observables in the $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decay
• Branching fraction measurements of the rare $B_s^0\to \varphi {\mu }^{+}{\mu }^{-}$ and $B_s^0\to f_2^{\prime }(1525){\mu }^{+}{\mu }^{-}$ decays
• Improved Theory Predictions and Global Analysis of Exclusive $\mathbf{b}\to \mathbf{s}{\mathbf{\mu }}^{+}{\mathbf{\mu }}^{-}$ Processes
• Rare $b$ decays meet high-mass Drell-Yan
• To (b)e or not to (b)e: No electrons at LHCb
• Angular analysis of the $B^{+}\to K^{\ast +}{\mu }^{+}{\mu }^{-}$ decay
• $B$ Flavour Anomalies: 2021 Theoretical Status Report
• Opposite-side flavour tagging of B mesons at the LHCb experiment
• Time dependence in $B\to V\ell \ell$ decays
• Review of Semileptonic $B$ Anomalies
• The time-dependent angular analysis of $B_d\to K_S\ell \ell$, a new benchmark for new physics
• The LHCb Stripping Project: Sustainable Legacy Data Processing for High-Energy Physics
• Measurement of CP violation in $B^0\to \psi (\to {\ell }^{+}{\ell }^{-})K_S^0(\to {\pi }^{+}{\pi }^{-})$ decays
• $CP$ violation in $b\to s\ell \ell$: a model independent analysis
• Fingerprinting CP-violating New Physics with $B\to K{\mu }^{+}{\mu }^{-}$
• A complete description of P- and S-wave contributions to the $B^0\to K^{+}{\pi }^{-}{\ell }^{+}{\ell }^{-}$ decay
• Measurement of the ${\Lambda }_b^0\to \Lambda (1520){\mu }^{+}{\mu }^{-}$ differential branching fraction