| THE PHYSICS OF ELEMENTARY PARTICLES AND FIELDS |
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Production of the $X(4014)$ as the Spin-2 Partner of $X(3872)$ in $e^+e^-$ Collisions |
| Pan-Pan Shi1,2,3*, Vadim Baru4*, Feng-Kun Guo1,2,5*, Christoph Hanhart6*, and Alexey Nefediev7,8* |
1 CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190, China
2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
3Departamento de Física Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC Institutos de Investigación de Paterna, Aptdo. 22085, 46071 Valencia, Spain
4Institut für Theoretische Physik II, Ruhr-Universität Bochum, D-44780 Bochum, Germany
5Peng Huanwu Collaborative Center for Research and Education, Beihang University, Beijing 100191, China
6Institute for Advanced Simulation, Institut für Kernphysik and Jülich Center for Hadron Physics, Forschungszentrum Jülich, D-52425 Jülich, Germany
7Jozef Stefan Institute, Jamova 39, 1000, Ljubljana, Slovenia
8CeFEMA, Center of Physics and Engineering of Advanced Materials, Instituto Superior Técnico, Avenida Rovisco Pais 1, 1049-001 Lisboa, Portugal
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| Cite this article: |
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Pan-Pan Shi, Vadim Baru, Feng-Kun Guo et al 2024 Chin. Phys. Lett. 41 031301 |
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Abstract In 2021, the Belle collaboration reported the first observation of a new structure in the $\psi(2S) \gamma$ final state produced in the two-photon fusion process. In the hadronic molecule picture, this new structure can be associated with the shallow isoscalar $D^*\bar{D}^*$ bound state and as such is an excellent candidate for the spin-2 partner of the $X(3872)$ with the quantum numbers $J^{\rm PC}=2^{++}$ conventionally named $X_2$. In this work we evaluate the electronic width of this new state and argue that its nature is sensitive to its total width, the experimental measurement currently available being unable to distinguish between different options. Our estimates demonstrate that the planned Super $\tau$-Charm Facility offers a promising opportunity to search for and study this new state in the invariant mass distributions for the final states $J/\psi\gamma$ and $\psi(2S)\gamma$.
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Received: 19 December 2023
Published: 14 March 2024
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| PACS: |
03.67.Lx
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(Quantum computation architectures and implementations)
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03.67.-a
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(Quantum information)
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03.65.Yz
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(Decoherence; open systems; quantum statistical methods)
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03.67.Pp
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(Quantum error correction and other methods for protection against decoherence)
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