Using X(3823)→J/ψπ + π − to identify coupled-channel effects
| Autor: | Dian-Yong Chen, Xiang Liu, Bo Wang, Estia Eichten, Hao Xu, Susana Coito |
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| Rok vydání: | 2016 |
| Předmět: |
Physics
Quantum chromodynamics Particle physics Physics and Astronomy (miscellaneous) 010308 nuclear & particles physics Spectrum (functional analysis) State (functional analysis) 01 natural sciences Amplitude Distribution (mathematics) 0103 physical sciences High Energy Physics::Experiment Invariant mass 010306 general physics Multipole expansion Bar (unit) |
| Zdroj: | Frontiers of Physics. 11 |
| ISSN: | 2095-0470 2095-0462 |
| DOI: | 10.1007/s11467-016-0564-7 |
| Popis: | Very recently, the Belle and BESIII experiments observed a new charmonium-like state $X(3823)$, which is a good candidate for the $D$-wave charmonium $\psi(1^3D_2)$. Because the $X(3823)$ is just near the $D\bar{D}^*$ threshold, the decay $X(3823)\to J/\psi\pi^+\pi^-$ can be a golden channel to test the significance of coupled-channel effects. In this work, this decay is considered including both the hidden-charm dipion and the usual quantum chromodynamics multipole expansion (QCDME) contributions. The partial decay width, the dipion invariant mass spectrum distribution $\mathrm{d}\Gamma[X(3823)\to J/\psi\pi^+\pi^-]/\mathrm{d}m_{\pi^+\pi^-}$, and the corresponding $\mathrm{d}\Gamma[X(3823)\to J/\psi\pi^+\pi^-]/\mathrm{d}\cos\theta$ distribution are computed. Many parameters are determined from existing experimental data, so the results depend mainly only on one unknown phase between the QCDME and hidden-charm dipion amplitudes. |
| Databáze: | OpenAIRE |
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