Measurement of the D?? polarization in the decay B0 ? D???+??

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2018

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We report the first measurement of the D?? meson polarization in the decay B0 ? D???+?? using the full data sample of 772�106 BB� pairs recorded with the Belle detector at the KEKB electron-positron collider. Our result, FLD? = 0.60 �0.08(stat) �0.04(sys), where FLD? denotes the D?? meson longitudinal polarization fraction, agrees within about 1.7 standard deviations of the standard model prediction. � 2018 Heidelberg University. All rights reserved.

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