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

BESIII Collaboration

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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+νe)×B(a0(980)-→ηπ-)=[1.33-0.29+0.33(stat)±0.09(syst)]×10-4 and B(D+→a0(980)0e+νe)×B(a0(980)0→ηπ0)=[1.66-0.66+0.81(stat)±0.11(syst)]×10-4. This is the first time the a0(980) meson has been measured in a D0 semileptonic decay, which would open one more interesting page in the investigation of the nature of the puzzling a0(980) states.

Original languageEnglish
Article number081802
Number of pages8
JournalPhysical Review Letters
Issue number8
Publication statusPublished - 24 Aug 2018


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