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Precision measurement of the $D^{*0}$ decay branching fractions · Around

2014

Precision measurement of the $D^{*0}$ decay branching fractions

Ablikim, M., Achasov, M. N., Ai, X. C. et al.

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Using 482 pb$^{-1}$ of data taken at $\sqrt{s}=4.009$ GeV, we measure the branching fractions of the decays of $D^{*0}$ into $D^0\pi^0$ and $D^0\gamma$ to be $\BR(D^{*0} \to D^0\pi^0)=(65.5\pm 0.8\pm 0.5)%$ and $\BR(D^{*0} \to D^0\gamma)=(34.5\pm 0.8\pm 0.5)%$ respectively, by assuming that the $D^{*0}$ decays only into these two modes.

The ratio of the two branching fractions is $\BR(D^{*0} \to D^0\pi^0)/\BR(D^{*0} \to D^0\gamma) =1.90\pm 0.07\pm 0.05$, which is independent of the assumption made above.
The first uncertainties are statistical and the second ones systematic.
The precision is improved by a factor of three compared to the present world average values.

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