Measurement of e~+e~-→D■ cross sections at the ψ(3770) resonance
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摘要
We report new measurements of the cross sections for the production of DD final states at theψ(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~0and six D~+hadronic decay modes and use the ratio of the yield of fully reconstructed DD events("double tags")to the yield of all reconstructed D or D mesons("single tags")to determine the number of D~0 D~0and 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 beσ(e~+e~-→D~0D~0)=(3.615±0.010±0.038)nb andσ(e~+e~-→D~+D~-)=(2.830±0.011±0.026)nb,where the uncertainties are statistical and systematic,respectively.
        We report new measurements of the cross sections for the production of DD final states at theψ(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~0and six D~+hadronic decay modes and use the ratio of the yield of fully reconstructed DD events("double tags")to the yield of all reconstructed D or D mesons("single tags")to determine the number of D~0 D~0and 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 beσ(e~+e~-→D~0D~0)=(3.615±0.010±0.038)nb andσ(e~+e~-→D~+D~-)=(2.830±0.011±0.026)nb,where the uncertainties are statistical and systematic,respectively.
引文
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