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arXiv.org e-Print Archive
Other literature type . Preprint . 2023
https://doi.org/10.48550/arxiv...
Article . 2023
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First Observation of a Three-Resonance Structure in $e^+e^-\rightarrow${non-open} Charm Hadrons

Authors: BESIII Collaboration; Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ai, X. C.; Aliberti, R.; Amoroso, A.; +193 Authors

First Observation of a Three-Resonance Structure in $e^+e^-\rightarrow${non-open} Charm Hadrons

Abstract

We report the measurement of the cross sections for $e^+e^-$$\rightarrow${nOCH} (nOCH stands for non-open charm hadrons) with improved precision at center-of-mass energies from 3.645 to 3.871 GeV. We observe for the first time a three-resonance structure in the energy-dependent lineshape of the cross sections, which are $\mathcal R(3760)$, $\mathcal R(3780)$ and $\mathcal R(3810)$ with significances of $9.4\sigma$, $15.7\sigma$, and $9.8\sigma$, respectively. The $\mathcal R(3810)$ is observed for the first time. We found two solutions in analysis of the cross sections. For solution I [solution II], we measure the mass, the total width and the product of electronic width and nOCH decay branching fraction to be $(3805.8 \pm 1.1 \pm 2.7)$ [$(3805.8 \pm 1.1 \pm 2.7)$] MeV/$c^2$, $(11.6 \pm 2.6 \pm 1.9)$ [$(11.5 \pm 2.5 \pm 1.8)$] MeV, and $(10.8\pm 3.2\pm 2.3)$ [$(11.0\pm 2.9\pm 2.4)$] eV for the $\mathcal R(3810)$, respectively. In addition, we measure the branching fractions ${\mathcal B}({\mathcal R}(3760)$$\rightarrow${nOCH}$)=(24.5 \pm 13.4 \pm 27.4)\% [(6.8 \pm 5.4 \pm 7.6)\%]$ for the first time, and ${\mathcal B}(\mathcal R(3780)$$\rightarrow${nOCH}$)=(11.6 \pm 5.8 \pm 7.8)\% [(10.3 \pm 4.5 \pm 6.9)\%]$. Moreover, we determine the open-charm (OC) branching fraction ${\mathcal B}({\mathcal R}$$(3760)\rightarrow${OC}$)=(75.5 \pm 13.4 \pm 27.4)\% [(93.2 \pm 5.4 \pm 7.6)\%]$, which supports the interpretation of $\mathcal R(3760)$ as an OC pair molecular state, but contained a simple four-quark state component. The first uncertainties are from fits to the cross sections, and the second are systematic.

Keywords

High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, High Energy Physics - Experiment

56 references, page 1 of 6

G. Zhao1, J. Zhao40, J. Y. Zhao1,63, J. Z. Zhao1,58, Lei Zhao71,58, Ling Zhao1, M. G. Zhao44, S. J. Zhao81, Y. B. Zhao1,58, Y. X. Zhao32,63,

62 Turkish Accelerator Center Particle Factory Group, (A)Istinye University, 34010, Istanbul, Turkey; (B)Near East University, Nicosia, North Cyprus, 99138, Mersin 10, Turkey 63 University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China 64 University of Groningen, NL-9747 AA Groningen, The Netherlands 65 University of Hawaii, Honolulu, Hawaii 96822, USA 66 University of Jinan, Jinan 250022, People's Republic of China 67 University of Manchester, Oxford Road, Manchester, M13 9PL, United Kingdom 68 University of Muenster, Wilhelm-Klemm-Strasse 9, 48149 Muenster, Germany 69 University of Oxford, Keble Road, Oxford OX13RH, United Kingdom 70 University of Science and Technology Liaoning, Anshan 114051, People's Republic of China 71 University of Science and Technology of China, Hefei 230026, People's Republic of China 72 University of South China, Hengyang 421001, People's Republic of China 73 University of the Punjab, Lahore-54590, Pakistan

74 University of Turin and INFN, (A)University of Turin, I-10125, Turin, Italy; (B)University of Eastern Piedmont, I-15121, Alessandria, Italy; (C)INFN, I-10125, Turin, Italy 75 Uppsala University, Box 516, SE-75120 Uppsala, Sweden 76 Wuhan University, Wuhan 430072, People's Republic of China 77 Xinyang Normal University, Xinyang 464000, People's Republic of China 78 Yantai University, Yantai 264005, People's Republic of China 79 Yunnan University, Kunming 650500, People's Republic of China 80 Zhejiang University, Hangzhou 310027, People's Republic of China 81 Zhengzhou University, Zhengzhou 450001, People's Republic of China

12192264, 12192265, 12221005, 12225509, 12235017; the

tier Sciences under Contracts Nos. QYZDJ-SSW-SLH003,

QYZDJ-SSW-SLH040; 100 Talents Program of CAS; The

CAS Research Program under Code No. Y41G1010Y1; The

CAS Other Research Program under Code No. Y129360;

ogy; ERC under Contract No. 758462; European Union's

Horizon 2020 research and innovation programme under

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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