Publication Date:
2018-07-27
Description:
We report new measurements of the cross sections for the production of DD̄ final states at the ψ(3770) resonance. Our data sample consists of an integrated luminosity of 2.93 fb −1 of e + e − annihilation data produced by the BEPCII collider and collected and analyzed with the BESIII detector. We exclusively reconstruct three D 0 and six D + hadronic decay modes and use the ratio of the yield of fully reconstructed DD̄ events (“double tags”) to the yield of all reconstructed D or D̄ mesons (“single tags”) to determine the number of D 0 D̄ 0 and D + D − events, benefiting from the cancellation of many systematic uncertainties. Combining these yields with an independent determination of the integrated luminosity of the data sample, we find the cross sections to be σ (e + e − → D 0 D̄ 0 ) nb and σ (e + e − → D + D −
Print ISSN:
1674-1137
Topics:
Physics
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