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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
