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論文

Measurement of time-dependent $$CP$$ violation in $$B^0 to K^0_S pi^0 pi^0$$ decays

遊佐 洋右*; 谷田 聖; Belle Collaboration*; 他159名*

Physical Review D, 99(1), p.011102_1 - 011102_7, 2019/01

AA2019-0530.pdf:0.33MB

 被引用回数:2 パーセンタイル:13.7(Astronomy & Astrophysics)

We report a measurement of time-dependent $$CP$$ violation in $$B^0 to K^0_S pi^0 pi^0$$ decays using a data sample of $$772 times 10^6$$ $$Bbar{B}$$ pairs collected by the Belle experiment running at the $$Upsilon (4S)$$ resonance at the KEKB $$e^+ e^-$$ collider. This decay proceeds mainly via a $$bto sdbar{d}$$ "penguin" amplitude. The results are $$sin 2phi^{rm eff}_1 = 0.92^{+0.27}_{-0.31}~$$ (stat.) $$pm 0.11$$ (syst.) and $$mathcal{A} = 0.28 pm 0.21$$ (stat.) $$pm 0.04$$ (syst.), which are the most precise measurements of $$CP$$ violation in this decay mode to date. The value for the $$CP$$-violating parameter $$sin 2phi^{rm eff}_1$$ is consistent with that obtained using decay modes proceeding via a $$bto cbar{c}s$$ "tree" amplitude.

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