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arxiv 1512.02145 v3 pith:H6CGLCIE submitted 2015-12-07 hep-ex
Observation of the decay B_s⁰rightarrow K⁰overline{K}⁰
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We measure the decay $B_s^0\rightarrow K^0\overline{K}^0$ using data collected at the $\Upsilon(5S)$ resonance with the Belle detector at the KEKB $e^+e^-$ collider. The data sample used corresponds to an integrated luminosity of 121.4 ${\rm fb^{-1}}$. We measure a branching fraction $\mathcal{B}(B_s^0\rightarrow K^0\overline{K}^0) = [19.6\,^{+5.8}_{-5.1}({\rm stat.})\,\pm1.0({\rm sys.})\,\pm 2.0(N^{}_{B_s^0\overline{B}_s^0})]\times 10^{-6}$ with a significance of 5.1 standard deviations. This measurement constitutes the first observation of this decay.
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Method to study $CP$ violation in $B_s^0\to K_S K^\pm \pi^\mp$ decays
hep-ph 2026-06 unverdicted novelty 7.0
A method is developed to relate amplitudes for B_s^0 → K_S K* resonances in the two final states, enabling the first tagged decay-time-dependent Dalitz analysis to measure the effective weak phase φ_s^eff.
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