Year: 2007
Type: article
Abstract: The exclusive decay of $\ensuremath{\Upsilon}$ to a vector plus pseudoscalar charmonium is studied in perturbative QCD. The corresponding branching ratios are predicted to be of order ${10}^{\ensuremath{-}6}$ for the first three $\ensuremath{\Upsilon}$ resonances, and one expects these decay modes should be discovered in the prospective high-luminosity ${e}^{+}{e}^{\ensuremath{-}}$ facilities such as the Super $B$ factory. As a manifestation of the short-distance loop contribution, the relative phases among strong, electromagnetic, and radiative decay amplitudes can be deduced. It is particularly interesting to find that the relative phase between strong and electromagnetic amplitudes is nearly orthogonal. The resonance-continuum interference effect for double charmonium production near various $\ensuremath{\Upsilon}$ resonances in ${e}^{+}{e}^{\ensuremath{-}}$ annihilation is addressed.
Author: Yu Jia
Institutions: Chinese Academy of Sciences, Institute of High Energy Physics
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2190701412