Pseudoscalar quarkonium exclusive decays to vector meson pair |
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Authors: | Peng SunGang Hao Cong-Feng Qiao |
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Institution: | a College of Physical Sciences, Graduate University of Chinese Academy of Sciences, YuQuan Road 19A, Beijing 100049, China b Theoretical Physics Center for Science Facilities (TPCSF), CAS, YuQuan Road 19B, Beijing 100049, China |
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Abstract: | The pseudoscalar quarkonia exclusive decays to light mesons still poses a challenge to the theoretical understanding of quarkonium properties in decay. In this work, we evaluate the processes of pseudoscalar heavy quarkonium decays into vector meson pairs, especially the helicity suppressed processes of ηb→J/ψJ/ψ and ηc→VV. In the framework of NRQCD, the branching fraction of Brηb→J/ψJ/ψ] are evaluated at the next-to-leading order of perturbative QCD; and within the light-cone distribution formalism, we calculate also the higher twist effects in these processes. Numerical results show that the higher twist terms contribute more than what from the NLO QCD corrections in the process of ηb→J/ψJ/ψ. It is found that the experimental results on ηc→VV are hard to be understood by merely the quark model and perturbative QCD calculation. |
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Keywords: | Perturbative QCD Non-relativistic quark model Charmonium decay |
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