Triangle singularity in the production of $X\left(3872\right)$ and a photon in $e^{+}{e}^{-}$ annihilation

Journal Article · 28 August 2019 · Physical Review D

DOI: https://doi.org/10.1103/PhysRevD.100.031501 · OSTI ID:1559078

Braaten, Eric ^[1]; He, Li-Ping  ^[1]; Ingles, Kevin ^[1]

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1. The Ohio State Univ., Columbus, OH (United States)

If the $X(3872)$ is a weakly bound charm-meson molecule, it can be produced in $e^+ e^-$ annihilation by the creation of $$D^{*0} \bar D^{*0}$$ from a virtual photon followed by the rescattering of the charm-meson pair into $$X$$ and a photon. A triangle singularity produces a narrow peak in the cross section for $$e^+ e^- \to X \gamma$$ about 2.2 MeV above the $$D^{*0} \bar{D}^{*0}$$ threshold. We predict the normalized cross section in the region near the peak. The peak from the triangle singularity may be observable by the BESIII detector.

• Research Organization: The Ohio State Univ., Columbus, OH (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
• Grant/Contract Number: SC0011726; PHY-1607190
• OSTI ID: 1559078
• Alternate ID(s): OSTI ID: 1602471
• Journal Information: Physical Review D, Vol. 100, Issue 3; ISSN 2470-0010
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English