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Evidence for $X(3872)\rightarrow J/\psi \pi^+\pi^-$ produced in single-tag two-photon interactions
- Source :
- Phys. Rev. Lett. 126, 122001 (2021)
- Publication Year :
- 2020
-
Abstract
- We report the first evidence for $X(3872)$ production in two-photon interactions by tagging either the electron or the position in the final state, exploring the highly virtual photon region. The search is performed in $e^+e^- \rightarrow e^+e^-J/\psi\pi^+\pi^-$, using 825 fb$^{-1}$ of data collected by the Belle detector operated at the KEKB $e^+e^-$ collider. We observe three $X(3872)$ candidates with an expected background of $0.11\pm 0.10$ events, with a significance of 3.2$\sigma$. We obtain an estimated value for $\tilde{\Gamma}_{\gamma\gamma}{\cal B}(X(3872)\rightarrow J/\psi\pi^+\pi^-$) assuming the $Q^2$ dependence predicted by a $c\bar{c}$ meson model, where $-Q^2$ is the invariant mass-squared of the virtual photon. No $X(3915)\rightarrow J/\psi\pi^+\pi^-$ candidates are found.<br />Comment: To be published in Physical Review Letters
- Subjects :
- High Energy Physics - Experiment
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. Lett. 126, 122001 (2021)
- Publication Type :
- Report
- Accession number :
- edsarx.2007.05696
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevLett.126.122001