In Pursuit of New Physics with $B_d^0\to J/\psi K^0$ and $B_s^0\to J/\psi \varphi$ Decays at the High-Precision Frontier

Abstract

The decays $B_d^0\to J/\psi K_{\text{S}}^0$and $B_s^0\to J/\psi \varphi$ play a key role for the determination of the $B_q^0$-${\bar{B}}_q^0$ ($q=d,s$) mixing phases ${\varphi }_d$ and ${\varphi }_s$, respectively. The theoretical precision of the extraction of these quantities is limited by doubly Cabibbo-suppressed penguin topologies, which can be included through control channels by means of the $SU(3)$ flavour symmetry of strong interactions. Using the currently available data and a new simultaneous analysis, we discuss the state-of-the-art picture of these effects and include them in the extracted ${\varphi }_q$ values. We have a critical look at the Standard Model predictions of these phases and explore the room left for new physics. Considering future scenarios for the high-precision era of flavour physics, we illustrate that we may obtain signals for physics beyond the Standard Model with a significance well above five standard deviations. We also determine effective colour-suppression factors of $B_d^0\to J/\psi K^0$, $B_d^0\to J/\psi K_{\text{S}}^0$ and $B_d^0\to J/\psi {\pi }^0$ decays, which serve as benchmarks for QCD calculations of the underlying decay dynamics, and present a new method using information from semileptonic $B_d^0\to {\pi }^{-}{\ell }^{+}{\nu }_{\ell }$ and $B_s^0\to K^{-}{\ell }^{+}{\nu }_{\ell }$ decays.

33 pages, 13 figures, matches published version

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Cited by in corpus (23)

• Collider Signals of Baryogenesis and Dark Matter from $B$ Mesons: A Roadmap to Discovery
• Heavy Flavour Physics and CP Violation at LHCb: a Ten-Year Review
• Measurement of CP violation in $B^0\to \psi (\to {\ell }^{+}{\ell }^{-})K_S^0(\to {\pi }^{+}{\pi }^{-})$ decays
• New Physics in $B_q^0-{\bar{B}}_q^0$ Mixing: Present Challenges, Prospects, and Implications for $B_q^0\to {\mu }^{+}{\mu }^{-}$
• Penguin Effects in $B_d^0\to J/\psi K_S^0$ and $B_s^0\to J/\psi \varphi$
• Fingerprinting CP-violating New Physics with $B\to K{\mu }^{+}{\mu }^{-}$
• Using $B_s^0\to D_s^{\mp }{K}^{\pm }$ Decays as a Portal to New Physics
• Revealing New Physics in $B_s^0\to D_s^{\mp }{K}^{\pm }$ Decays
• New graph-neural-network flavor tagger for Belle II and measurement of $\sin 2{\varphi }_1$ in $B^0\to J/\psi K_{\text{S}}^0$ decays
• First evidence for direct CP violation in beauty to charmonium decays
• New Perspectives for Testing Electron-Muon Universality
• Zooming into CP violation in $B_{(s)}\to hh$ Decays
• Impact of systematic and amplitude model correlations within and between systems of combined input: A case study with ${\varphi }_2$ ($\alpha$)
• How to tame penguins: Advancing to high-precision measurements of ${\varphi }_d$ and ${\varphi }_s$
• Targeting (Pseudo)-Scalar CP Violation with $B_s\to {\mu }^{+}{\mu }^{-}$
• Observation of time-dependent $CP$ violation and measurement of the branching fraction of $B^0\to J/\psi {\pi }^0$ decays
• Observation of the decay $B^0\to J/\psi \omega$ at Belle II
• Measurement of $CP$ asymmetry in $B_s^0\to D_s^{\mp }{K}^{\pm }$ decays
• 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
• First evidence of $CP$ violation in beauty baryon to charmonium decays
• Measurement of the Branching Fraction of $B^0\to J/\psi {\pi }^0$ Decays
• Measurement of the B${}_{\mathrm{s}}^0$ $\to$ J/$\psi$K${}_{\mathrm{S}}^0$ effective lifetime from proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Observation of $CP$ violation in $B^0\to J/\psi \rho (770{)}^0$ decays