Observation of the Semileptonic Decay D0→a0(980)−e+νe and Evidence for D+→a0(980)0e+νe

Abstract

Using an e+e collision data sample of 2.93 fb−1 collected at a center-of-mass energy of 3.773 GeV by the BESIII detector at BEPCII, we report the observation of D0→a0(980)−e+νe and evidence for D+→a0(980)0e+νe  with significances of 6.4σ and 2.9σ, respectively. The absolute branching fractions are determined to be B(D0→a0(980)−e+νeB(a0(980)−→ηπ−)=(1.33−0.29+0.33(stat)±0.09(syst))×10−4 and B(D+→a0(980)0e+νeB(a0(980)0→ηπ0)=(1.66−0.66+0.81(stat)±0.11(syst))×10−4 . An upper limit of B(D+→a0(980)0e+νeB(a0(980)0→ηπ0)<3.0×10−4  is also determined at the 90% confidence level.

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Ablikim, M., et al. "Observation of the Semileptonic Decay D0→a0(980)−e+νe and Evidence for D+→a0(980)0e+νe." 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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