2005/06/30 by Y. J. Zhang, Yu-Jie Zhang, Ying-Jia Gao +3 · 4 citations
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevlett.96.092001
published as Phys.Rev.Lett. 96 (2006) 092001 · Version appeared in PRL, Figure 3 added showing the renormalization scale dependence of the cross section, new BaBar data added
openalex publication_date 2006/03/06 · arxiv created 2006/03/07 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01
One of the most challenging open problems in heavy quarkonium physics is the double charm production in e+e^\ensuremath- annihilation at B factories. The measured cross section of e+e^\ensuremath-\ensuremath→J/\ensuremathψ+\ensuremathηc is much larger than leading order (LO) theoretical predictions. With the nonrelativistic QCD factorization formalism, we calculate the next-to-leading order (NLO) QCD correction to this process. Taking all one-loop self-energy, triangle, box, and pentagon diagrams into account, and factoring the Coulomb-singular term into the cc bound state wave function, we get an ultraviolet and infrared finite correction to the cross section of e+e^\ensuremath-\ensuremath→J/\ensuremathψ+\ensuremathηc at √(s)=10.6 GeV. We find that the NLO QCD correction can substantially enhance the cross section with a K factor (the ratio of NLO to LO) of about 1.8--2.1; hence, it greatly reduces the large discrepancy between theory and experiment.