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First Observation of a Three-Resonance Structure in e+e−→Nonopen Charm Hadrons
Physical Review Letters ( IF 8.6 ) Pub Date : 2024-05-09 , DOI: 10.1103/physrevlett.132.191902
M. Ablikim 1 , M. N. Achasov 2 , P. Adlarson 3 , X. C. Ai 4 , R. Aliberti 5 , A. Amoroso 6, 7 , M. R. An 8 , Q. An 9, 10 , Y. Bai 11 , O. Bakina 12 , I. Balossino 13 , Y. Ban 14 , V. Batozskaya 1, 15 , K. Begzsuren 16 , N. Berger 5 , M. Berlowski 15 , M. Bertani 17 , D. Bettoni 13 , F. Bianchi 6, 7 , E. Bianco 6, 7 , A. Bortone 6, 7 , I. Boyko 12 , R. A. Briere 18 , A. Brueggemann 19 , H. Cai 20 , X. Cai 1, 10 , A. Calcaterra 17 , G. F. Cao 1, 21 , N. Cao 1, 21 , S. A. Cetin 22 , J. F. Chang 1, 10 , T. T. Chang 23 , W. L. Chang 1, 21 , G. R. Che 24 , G. Chelkov 12 , C. Chen 24 , Chao Chen 25 , G. Chen 1 , H. S. Chen 1, 21 , M. L. Chen 1, 10, 21 , S. J. Chen 26 , S. M. Chen 27 , T. Chen 1, 21 , X. R. Chen 21, 28 , X. T. Chen 1, 21 , Y. B. Chen 1, 10 , Y. Q. Chen 29 , Z. J. Chen 30 , W. S. Cheng 7 , S. K. Choi 31 , X. Chu 24 , G. Cibinetto 13 , S. C. Coen 32 , F. Cossio 7 , J. J. Cui 33 , H. L. Dai 1, 10 , J. P. Dai 34 , A. Dbeyssi 35 , R. E. de Boer 32 , D. Dedovich 12 , Z. Y. 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Affiliation  

We report the measurement of the inclusive cross sections for e+enOCH (where nOCH denotes non-open charm hadrons) with improved precision at center-of-mass (c.m.) energies from 3.645 to 3.871 GeV. We observe three resonances: R(3760), R(3780), and R(3810) with significances of 8.1σ, 13.7σ, and 8.8σ, respectively. The R(3810) state is observed for the first time, while the R(3760) and R(3780) states are observed for the first time in the nOCH cross sections. Two sets of resonance parameters describe the energy-dependent line shape of the cross sections well. In set I [set II], the R(3810) state has mass (3805.7±1.1±2.7) [(3805.7±1.1±2.7)]MeV/c2, total width (11.6±2.9±1.9) [(11.5±2.8±1.9)]MeV, and an electronic width multiplied by the nOCH decay branching fraction of (10.9±3.8±2.5) [(11.0±3.4±2.5)]eV. In addition, we measure the branching fractions B[R(3760)nOCH]=(25.2±16.1±30.4)%[(6.4±4.8±7.7)%] and B[R(3780)nOCH]=(12.3±6.6±8.3)%[(10.4±4.8±7.0)%] for the first time. The R(3760) state can be interpreted as an open-charm (OC) molecular state, but containing a simple four-quark state component. The R(3810) state can be interpreted as a hadrocharmonium state.

中文翻译:

首次观测到 e+e−→非开炁强子中的三共振结构

我们报告了包含横截面的测量结果e+e-氯甲烷(其中 nOCH 表示非开粲强子),质心 (cm) 能量的精度从 3.645 GeV 提高到 3.871 GeV。我们观察到三种共振:3760,3780, 和3810具有以下意义8.1σ,13.7σ, 和8.8σ, 分别。这3810状态是第一次被观察到,而37603780首次在 nOCH 截面中观察到状态。两组共振参数很好地描述了横截面的能量相关线形状。在集合 I [集合 II] 中,3810状态有质量(3805.7±1.1±2.7[3805.7±1.1±2.7]兆伏/C2,总宽度(11.6±2.9±1.9[11.5±2.8±1.9]兆伏,以及电子宽度乘以 (10.9±3.8±2.5[11.0±3.4±2.5]电子伏特。此外,我们还测量了支化分数[3760氯甲烷]=25.2±16.1±30.4%[6.4±4.8±7.7%][3780氯甲烷]=12.3±6.6±8.3%[10.4±4.8±7.0%]首次。这3760态可以解释为开魅力(OC)分子态,但包含简单的四夸克态成分。这3810态可以解释为强鲎态。
更新日期:2024-05-10
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