Abstract
The cross section of the process e^{+}e^{-}→π^{+}D^{0}D^{*-} for center-of-mass energies from 4.05 to 4.60GeV is measured precisely using data samples collected with the BESIII detector operating at the BEPCII storage ring. Two enhancements are clearly visible in the cross section around 4.23 and 4.40GeV. Using several models to describe the dressed cross section yields stable parameters for the first enhancement, which has a mass of 4228.6±4.1±6.3 MeV/c^{2} and a width of 77.0±6.8±6.3 MeV, where the first uncertainties are statistical and the second ones are systematic. Our resonant mass is consistent with previous observations of the Y(4220) state and the theoretical prediction of a DD[over ¯]_{1}(2420) molecule. This result is the first observation of Y(4220) associated with an open-charm final state. Fits with three resonance functions with additional Y(4260), Y(4320), Y(4360), ψ(4415), or a new resonance do not show significant contributions from either of these resonances. The second enhancement is not from a single known resonance. It could contain contributions from ψ(4415) and other resonances, and a detailed amplitude analysis is required to better understand this enhancement.
Highlights
precisely using data samples collected with the BESIII detector operating at the
Two enhancements are clearly visible in the cross section
which has a mass of 4228.6 Æ 4.1 Æ 6.3 MeV
Summary
The cross section of the process eþe− → πþD0DÃ− for center-of-mass energies from 4.05 to 4.60 GeV is measured precisely using data samples collected with the BESIII detector operating at the BEPCII storage ring. A study of the inclusive MC samples shows that only the isospin partner process eþe− → πþD−DÃ0 (BKG1, hereafter) has an enhancement around the DÃ− mass region in the RMcorðD0πþÞ distribution. The shape of this background process is different at each energy point and is taken from the MC simulation. The uncertainties associated with the BODY3 signal MC model consist of three parts: the choice
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