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Observation of a Neutral Structure near the $D\barD^*$ Mass Threshold in $e^+e^? \to (D ?D )0π0 at ps = 4.226 and 4.257 GeV

Submit Time: 2016-09-12
Author: Ablikim, M. and others 1 ;
Institute: 1.BESIII Collaboration;


A neutral structure in the?DD???system around the?DD???mass threshold is observed with a statistical significance greater than 10σ?in the processes?e+e?→D+D??π0+c.c.?and?e+e?→D0D??0π0+c.c.?at?s√?= 4.226 and 4.257 GeV in the BESIII experiment. The structure is denoted as?Zc(3885)0. Assuming the presence of a resonance, its pole mass and width are determined to be (3885.7+4.3?5.7(stat)±8.4(syst)) MeV/c2?and (35+11?12(stat)±15(syst)) MeV, respectively. The Born cross sections are measured to be?σ(e+e?→Zc(3885)0π0,Zc(3885)0→DD??)=(77±13(stat)±17(syst)) pb at 4.226 GeV and (47±9(stat)±10(syst)) pb at 4.257 GeV. The ratio of decay rates?B(Zc(3885)0→D+D??+c.c.)B(Zc(3885)0→D0D??0+c.c.)?is determined to be0.96±0.18(stat)±0.12(syst), consistent with no isospin violation in the process?Zc(3885)0→DD??.
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Recommended references: Ablikim, M. and others.(2016).Observation of a Neutral Structure near the $D\barD^*$ Mass Threshold in $e^+e^? \to (D ?D )0π0 at ps = 4.226 and 4.257 GeV.[ChinaXiv:201609.00742] (Click&Copy)
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[V1] 2016-09-12 08:37:18 chinaXiv:201609.00742V1 Download
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