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Measurement of the branching fraction and time-dependent $$CP$$ asymmetry for $$B^0to J/psipi^0$$ decays

$$B^0to J/psipi^0$$崩壊の分岐比の測定と時間依存$$CP$$非対称性の測定

Pal, B.*; 谷田 聖; Belle Collaboration*; 他158名*

Pal, B.*; Tanida, Kiyoshi; Belle Collaboration*; 158 of others*

We measure the branching fraction and time-dependent $$CP$$-violating asymmetry for $$B^0to J/psipi^0$$ decays using a data sample of 711 $${rm fb^{-1}}$$ collected on the $$Upsilon(4S)$$ resonance by the Belle experiment running at the KEKB $$e^+e^-$$ collider. The branching fraction is measured to be $$mathcal{B}(B^0to J/psipi^0) = [1.62,pm 0.11~({rm stat}) pm0.07~({rm syst})]times 10^{-5}$$, which is the most precise measurement to date. The measured $$CP$$ asymmetry parameters are $$mathcal{S} = -0.59,pm 0.19~({rm stat}) pm 0.03~({rm syst})$$ and $$mathcal{A} = -0.15,pm 0.14~({rm stat}),^{+0.04}_{-0.03}~({rm syst})$$. The mixing-induced $$CP$$ asymmetry ($$mathcal{S}$$) differs from the case of no $$CP$$ violation by 3.0 standard deviations, and the direct $$CP$$ asymmetry ($$mathcal{A}$$) is consistent with zero.

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パーセンタイル:100

分野:Astronomy & Astrophysics

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