Abstract
Using an collision data sample of collected at a center-of-mass energy of 3.773 GeV by the BESIII detector at BEPCII, we report the observation of and evidence for with significances of and , respectively. The absolute branching fractions are determined to be and . This is the first time the meson has been measured in a semileptonic decay, which would open one more interesting page in the investigation of the nature of the puzzling states.
- Received 12 March 2018
- Revised 20 June 2018
DOI:https://doi.org/10.1103/PhysRevLett.121.081802
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society