Abstract
Using a data sample of collisions corresponding to an integrated luminosity of collected at a center-of-mass energy of with the BESIII detector, we measure the absolute branching fraction of the inclusive semileptonic decay with a double-tag method. We obtain , where the first uncertainty is statistical and the second systematic. Using the known lifetime and the charge-averaged semileptonic decay width of nonstrange charmed mesons ( and ), we obtain the ratio of the inclusive semileptonic decay widths .
- Received 25 May 2018
DOI:https://doi.org/10.1103/PhysRevLett.121.251801
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Published by the American Physical Society