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Study of the electromagnetic Dalitz decays $\psi(\Upsilon) \to \eta_{c}(\eta_{b}) l^{+} l^{-}$
- Source :
- Phys. Rev. D 100, 016018 (2019)
- Publication Year :
- 2019
-
Abstract
- We study the electromagnetic Dalitz (EM) decays, $\psi \to \eta_{c} l^{+} l^{-}$ and $\Upsilon \to \eta_{b} l^{+} l^{-}$ ($l = e$ or $\mu$), in which the lepton pair comes from the virtual photon emitted by the M1 transition from $c\bar{c}$ ($b\bar{b}$) spin triplet state to the spin singlet state. We estimate the partial width of $\psi(\Upsilon) \to \eta_{c}(\eta_{b}) l^{+} l^{-}$, based on the simple pole approximation. Besides, based on different QCD models, the partial width of $\psi(\Upsilon) \to \eta_{c}(\eta_{b}) \gamma$ is determined.
- Subjects :
- High Energy Physics - Phenomenology
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. D 100, 016018 (2019)
- Publication Type :
- Report
- Accession number :
- edsarx.1904.06085
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevD.100.016018