Exclusive Double Charmonium Production from $Υ$ Decay

Details Exclusive Double Charmonium Production from $Υ$ Decay Exclusive Double Charmonium Production from $Υ$ Decay

2007-06-25

arxiv.org/abs/0706.3685v1

Phys.Rev.D76:074007,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

10.1103/PhysRevD.76.074007

The exclusive decay of $\Upsilon$ to a vector plus pseudoscalar charmonium is studied in perturbative QCD. The corresponding branching ratios are predicted to be of order $10^{-6}$ for first three $\Upsilon$ resonances, and we expect these decay modes should be discovered in the prospective high-luminosity $e^+e^-$ facilities such as super $B$ experiment. 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 $\Upsilon$ resonances in $e^+e^-$ annihilation is addressed.

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