Improved measurement of $CP$ violation parameters in $B_s^0\to J/\psi K^{+}{K}^{-}$ decays in the vicinity of the $\varphi (1020)$ resonance

Abstract

The decay-time-dependent $CP$ asymmetry in $B_s^0\to J/\psi (\to {\mu }^{+}{\mu }^{-})K^{+}{K}^{-}$ decays is measured using proton-proton collision data, corresponding to an integrated luminosity of 6 $f{b}^{-1}$, collected with the LHCb detector at a center-of-mass energy of 13 TeV. Using a sample of approximately 349 000 $B_s^0$ signal decays with an invariant $K^{+}{K}^{-}$ mass in the vicinity of the $\varphi (1020)$ resonance, the $CP$-violating phase ${\varphi }_s$ is measured, along with the difference in decay widths of the light and heavy mass eigenstates of the $B_s^0$-${\bar{B}}_s^0$ system, $\Delta {\Gamma }_s$, and the difference of the average $B_s^0$ and $B^0$ meson decay widths, ${\Gamma }_s-{\Gamma }_d$. The values obtained are ${\varphi }_s=-0.039\pm 0.022\pm 0.006$ rad, $\Delta {\Gamma }_s=0.0845\pm 0.0044\pm 0.0024$ ps${}^{-1}$ and ${\Gamma }_s-{\Gamma }_d=-0.0056_{-0.0015}^{+0.0013}\pm 0.0014$ ps${}^{-1}$, where the first uncertainty is statistical and the second systematic. These are the most precise single measurements to date and are consistent with expectations based on the Standard Model and with the previous LHCb analyses of this decay. These results are combined with previous independent LHCb measurements. The phase ${\varphi }_s$ is also measured independently for each polarization state of the $K^{+}{K}^{-}$ system and shows no evidence for polarization dependence.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2023-016.html (LHCb public pages)

References in corpus (36)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• A Brief Introduction to PYTHIA 8.1
• LHCb Detector Performance
• sPlot: a statistical tool to unfold data distributions
• The LHCb Trigger and its Performance in 2011
• Performance of the LHCb Vertex Locator
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• Current status of the Standard Model CKM fit and constraints on $\Delta F=2$ New Physics
• Precision measurement of $CP$ violation in $B_s^0\to J/\psi K^{+}{K}^{-}$ decays
• Measurement of the CP-violating phase ${\varphi }_s^{J/\psi \varphi }$ using the flavor-tagged decay $B_s^0\to J/\psi \varphi$ in 8 fb${}^{-1}$ of $p \barp$ collisions
• Measurement of resonant and $CP$ components in ${\overline{B}}_s^0\to J/\psi {\pi }^{+}{\pi }^{-}$ decays
• Measurement of the Bottom-Strange Meson Mixing Phase in the Full CDF Data Set
• Precision measurement of the $B_s^0$-${\bar{B}}_s^0$ oscillation frequency with the decay $B^{0}_{s}\rightarrowD^{-}_{s}π^{+}$
• Measurement of the CP-violating phase ${\varphi }_s$ in ${\overline{B}}_s^0\to J/\psi {\pi }^{+}{\pi }^{-}$ decays
• Dimension-six matrix elements for meson mixing and lifetimes from sum rules
• Precise measurement of the $f_s/f_d$ ratio of fragmentation fractions and of $B_s^0$ decay branching fractions
• Opposite-side flavour tagging of B mesons at the LHCb experiment
• Model-independent bounds on new physics effects in non-leptonic tree-level decays of B-mesons
• Measurement of the CP-violating weak phase phi[s] and the decay width difference Delta Gamma[s] using the Bs to J/Psi phi(1020) decay channel in pp collisions at sqrt(s) = 8 TeV
• Amplitude analysis and branching fraction measurement of Bs->J/ψK+K-
• Measurement of the $CP$-violating phase ${\varphi }_s$ in $B_s^0\to J/\psi \varphi$ decays in ATLAS at 13 TeV
• Updated measurement of time-dependent $CP$-violating observables in $B_s^0\to J/\psi K^{+}{K}^{-}$ decays
• Measurement of the CP-violating phase ${\varphi }_s$ in ${\bar{B}}_s^0\to D_s^{+}{D}_s^{-}$ decays
• Parameter uncertainties in weighted unbinned maximum likelihood fits
• Flavour tagged time dependent angular analysis of the $B_s\to J/\psi \varphi$ decay and extraction of $\Delta \Gamma$ and the weak phase ${\varphi }_s$ in ATLAS
• First study of the CP-violating phase and decay-width difference in $B_s^0\to \psi (2S)\varphi$ decays
• Measurement of the CP-violating phase ${\varphi }_s$ and the $B_s^0$ meson decay width difference with $B_s^0\to J/\psi \varphi$ decays in ATLAS
• Measurement of the $B_c^{-}$ meson production fraction and asymmetry in 7 and 13 TeV $pp$ collisions
• Resonances and $CP$ violation in $B_s^0$ and ${\overline{B}}_s^0\to J/\psi K^{+}{K}^{-}$ decays in the mass region above the $\varphi (1020)$
• Measurement of the $CP$-violating phase ${\varphi }_{\mathrm{s}}$ in the B${}_{\mathrm{s}}^0$ $\to$ J$/\psi \varphi$(1020) $\to$ ${\mu }^{+}{\mu }^{-}$K${}^{+}$K${}^{-}$ channel in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• Precise determination of the B0s-B0sbar oscillation frequency
• A new algorithm for identifying the flavour of $B_s^0$ mesons at LHCb
• Measurement of the $CP$-violating phase ${\varphi }_s$ from $B_s^0\to J/\psi {\pi }^{+}{\pi }^{-}$ decays in 13 TeV $pp$ collisions
• Large Phase of B_s-\bar B_s Mixing in Supersymmetric Grand Unified Theories
• Inclusive Flavour Tagging Algorithm

Cited by in corpus (4)

• First evidence for direct CP violation in beauty to charmonium decays
• Prospect for measurement of the CP-violating phase ${\varphi }_s$ in the $B_s\to J/\psi \varphi$ channel at a future Z factory
• First evidence for mixing-induced $CP$ violation in B${}_{\mathrm{s}}^0$ $\to$ J/$\psi \varphi$(1020) decays in pp collisions at $\sqrt{s}=$ 13 TeV
• Observation of $CP$ violation in $B^0\to J/\psi \rho (770{)}^0$ decays