Improved Measurement of
C P B s 0 → J / ψ K + K −
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Cited by 2 publications
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Prospect for measurement of the CP-violating phase $$\phi _s$$ in the $$B_{s}\rightarrow J/\psi \phi $$ channel at a future Z factory
The CP-violating phase $$\phi _s$$ ϕ s , the $$B_{s}$$ B s decay width ($$\varGamma _s$$ Γ s ), and the $$B_{s}$$ B s decay width difference ($$\varDelta \varGamma _s$$ Δ Γ s ) are sensitive probes to new physics and can constrain the heavy quark expansion theory. The potential for the measurement at future Z factories is studied in this manuscript. It is found that operating at Tera-Z mode, the expected precision can reach: $$\sigma (\phi _s) = 4.6~\textrm{mrad}$$ σ ( ϕ s ) = 4.6 mrad , $$\sigma (\varDelta \varGamma _s) = 2.4~\mathrm {ns^{-1}}$$ σ ( Δ Γ s ) = 2.4 ns - 1 and $$\sigma (\varGamma _s) = 0.72~\mathrm {ns^{-1}}$$ σ ( Γ s ) = 0.72 ns - 1 . The precision of $$\phi _s $$ ϕ s is 40% larger than the expected precision with the LHCb experiment at HL-LHC. If operating at 10-Tera-Z mode, the precision of $$\phi _s $$ ϕ s can be measured at 45% of the precision obtained from the LHCb experiment at HL-LHC. However, the measurement of $$\varGamma _s$$ Γ s and $$\varDelta \varGamma _s$$ Δ Γ s cannot benefit from the excellent time resolution and tagging power of the future Z-factories. Only operating at 10-Tera-Z mode can the $$\varGamma _s$$ Γ s and $$\varDelta \varGamma _s$$ Δ Γ s reach an 18% larger precision than the precision expected to be obtained from LHCb at HL-LHC. The control of penguin contamination at the future Z-factories is also discussed.
Prospect for measurement of the CP-violating phase $$\phi _s$$ in the $$B_{s}\rightarrow J/\psi \phi $$ channel at a future Z factory
The CP-violating phase $$\phi _s$$ ϕ s , the $$B_{s}$$ B s decay width ($$\varGamma _s$$ Γ s ), and the $$B_{s}$$ B s decay width difference ($$\varDelta \varGamma _s$$ Δ Γ s ) are sensitive probes to new physics and can constrain the heavy quark expansion theory. The potential for the measurement at future Z factories is studied in this manuscript. It is found that operating at Tera-Z mode, the expected precision can reach: $$\sigma (\phi _s) = 4.6~\textrm{mrad}$$ σ ( ϕ s ) = 4.6 mrad , $$\sigma (\varDelta \varGamma _s) = 2.4~\mathrm {ns^{-1}}$$ σ ( Δ Γ s ) = 2.4 ns - 1 and $$\sigma (\varGamma _s) = 0.72~\mathrm {ns^{-1}}$$ σ ( Γ s ) = 0.72 ns - 1 . The precision of $$\phi _s $$ ϕ s is 40% larger than the expected precision with the LHCb experiment at HL-LHC. If operating at 10-Tera-Z mode, the precision of $$\phi _s $$ ϕ s can be measured at 45% of the precision obtained from the LHCb experiment at HL-LHC. However, the measurement of $$\varGamma _s$$ Γ s and $$\varDelta \varGamma _s$$ Δ Γ s cannot benefit from the excellent time resolution and tagging power of the future Z-factories. Only operating at 10-Tera-Z mode can the $$\varGamma _s$$ Γ s and $$\varDelta \varGamma _s$$ Δ Γ s reach an 18% larger precision than the precision expected to be obtained from LHCb at HL-LHC. The control of penguin contamination at the future Z-factories is also discussed.
Since its discovery in the 1960s, the violation of CP symmetry has intrigued scientists and stimulated the advancement of knowledge in particle physics. Numerous experiments were designed and built to study it in increasingly deeper detail. Nowadays, the phenomenon is well framed within the Standard Model of Particle Physics. Nevertheless, new results are being produced by modern experiments at colliders that challenge the current understanding of the model. In this article, the current status of CP violation studies and the role of CP violation in the search for effects beyond the Standard Model are described together with the prospects for ongoing and future experiments.
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