Production of X(3872) and a photon in e+e− annihilation
| Autor: | Li-Ping He, Kevin Ingles, Eric Braaten |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Physical Review D. 101 |
| ISSN: | 2470-0029 2470-0010 |
| DOI: | 10.1103/physrevd.101.014021 |
| Popis: | If $X(3872)$ is a weakly bound charm-meson molecule, it can be produced in ${e}^{+}{e}^{\ensuremath{-}}$ annihilation by the creation of ${D}^{*0}{\overline{D}}^{*0}$ from a virtual photon followed by the rescattering of the $P$-wave charm-meson pair into the $X$ and a photon. A triangle singularity produces a narrow peak in the cross section for ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}X\ensuremath{\gamma}$ about 2.2 MeV above the ${D}^{*0}{\overline{D}}^{*0}$ threshold. We predict the normalized cross section in the region of the peak. We show that the absorptive contribution to the cross section for ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{D}^{*0}{\overline{D}}^{*0}\ensuremath{\rightarrow}X\ensuremath{\gamma}$, which was calculated previously by Dubynskiy and Voloshin, does not give a good approximation to the peak from the triangle singularity. |
| Databáze: | OpenAIRE |
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