Measurement of the D?? polarization in the decay B0 → D??τ+ντ

Abdesselam A. et al.PAO-TI CHANG2021-07-282021-07-282018https://www.scopus.com/inward/record.uri?eid=2-s2.0-85083953835&partnerID=40&md5=fa7f3547e50618849db89595c041d304https://scholars.lib.ntu.edu.tw/handle/123456789/573830We report the first measurement of the D?? meson polarization in the decay B0 → D??τ+ντ 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.Bosons; Hadrons; Belle detectors; Data sample; Longitudinal polarization fraction; Standard deviation; The standard model; PolarizationMeasurement of the D?? polarization in the decay B0 → D??τ+ντconference paper2-s2.0-85083953835