Observation of the Semileptonic Decay and Evidence for
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Using an collision data sample of 2.93 fb 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 6.4σ and 2.9σ, respectively. The absolute branching fractions are determined to be and . An upper limit of is also determined at the 90% confidence level.
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Ablikim, M., et al. "Observation of the Semileptonic Decay and Evidence for ." Physical Review Letters, vol. 121, no. 8, pp. 81802, 2018-08-24, https://doi.org/10.1103/PhysRevLett.121.081802.
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Physical Review Letters
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