First Observation of a Three-Resonance Structure in $e^+e^-\rightarrow${non-open} Charm Hadrons
Branching fraction
Branching (polymer chemistry)
Charm (quantum number)
DOI:
10.48550/arxiv.2307.10948
Publication Date:
2023-01-01
AUTHORS (633)
ABSTRACT
We report the measurement of inclusive cross sections for $e^+e^-$$\rightarrow$nOCH (where nOCH denotes non-open charm hadrons) with improved precision at center-of-mass (c.m.) energies from 3.645 to 3.871 GeV. observe three resonances: $\mathcal R(3760)$, R(3780)$, and R(3810)$ significances $8.1\sigma$, $13.7\sigma$, $8.8\sigma$, respectively. The state is observed first time, while R(3760)$ R(3780)$ states are time in sections. Two sets resonance parameters describe energy-dependent line shape well. In set I [set II], has mass $(3805.7 \pm 1.1 2.7)$ [$(3805.7 2.7)$] MeV/$c^2$, total width $(11.6 2.9 1.9)$ [$(11.5 2.8 1.9)$] MeV, an electronic multiplied by decay branching fraction $(10.9\pm 3.8\pm 2.5)$ [$(11.0\pm 3.4\pm 2.5)$] eV. addition, we measure fractions ${\mathcal B}[{\mathcal R}(3760)$$\rightarrow$nOCH$]=(25.2 16.1 30.4)\% [(6.4 4.8 7.7)\%]$ B}[\mathcal R(3780)$$\rightarrow$nOCH$]=(12.3 6.6 8.3)\% [(10.4 7.0)\%]$ time. can be interpreted as open-charm (OC) molecular state, but containing a simple four-quark component. hadrocharmonium state.
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