Measurement of the Angle $φ_1(β)$ and $B \bar B$ Mixing (Recent Results from BaBar and Belle)

Physics – High Energy Physics – High Energy Physics - Experiment

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This is for proceeding for Physics in Collision 2003. Submission to arXiv was required for being accepted as the proceeding wr

Scientific paper

Recent results from BaBar and Belle experiments on $B \bar B$ mixing and $\sin 2\phi_1$ are presented. Accuracy of $\Delta m_d$ measurements has reached 1.2%. Higher order effects within the Standard Model or possible new physics effect that might appear in the $B \bar B$ mixing through non-zero $\Delta \Gamma/\Gamma$, CP violation, or $CPT$ violation have been explored. The BaBar and Belle results on $\sin 2\phi_1$ from the $b \to c \bar{c} s$ modes are in good agreement with each other and a combined result with an accuracy of 8% is in good agreement with a global CKM fit. A simple average of the $\sin 2\phi_1$ values that were measured in the penguin-loop dominated decay modes, $\phi K_S$, $\eta^{\prime} K_S$, and $K^+ K^- K_S$, shows about 2.5$\sigma$ deviation from the Standard Model.

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