第二届微扰量子场论研讨会

Exclusive double charmonium production at electron-positron collider is among the simplest hard exclusive reactions in perturbative QCD. The double charmonium production is first observed at two B factories at the beginning of this century and has stimulated long-lasting theoretical interests. The nonrelativistic QCD (NRQCD) factorization approach, a modern effective-field-theory-based approach that explicitly exploits the nonrelativistic nature of heavy quarkonium, provides a powerful and systematic tool kit to tackle double charmonium production processes. In this talk, I will introduce the framework and discuss the NNLO predictions.