Next-to-Leading Order QCD Correction to $\bm{e^+ e^- \to J/ψ+ η_c}$ at $\sqrt {s}=10.6$GeV}

Details Next-to-Leading Order QCD Correction to $\bm{e^+ e^- \to J/ψ+ η_c}$ at $\sqrt {s}=10.6$GeV} Next-to-Leading Order QCD Correction to $\bm{e^+ e^- \to J/ψ+ η_c}$ at $\sqrt {s}=10.6$GeV}

2005-06-07

arxiv.org/abs/hep-ph/0506076v3

Phys.Rev.Lett. 96 (2006) 092001

Physics

High Energy Physics

High Energy Physics - Phenomenology

Version appeared in PRL, Figure 3 added showing the renormalization scale dependence of the cross section, new BaBar data adde

Scientific paper

10.1103/PhysRevLett.96.092001

One of the most challenging open problems in heavy quarkonium physics is the double charm production in $e^+e^-$ annihilation at B factories. The measured cross section of $e^+ e^- \to J/\psi + \eta_c$ 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 $c\bar c$ bound state wave function, we get an ultraviolet and infrared finite correction to the cross section of $e^+e^-\to J/\psi + \eta_c$ at $\sqrt{s} =10.6$ 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. With $m_c=1.4{\rm GeV}$ and $\mu=2m_c$, the NLO cross section is estimated to be 18.9 fb, which reaches to the lower bound of experiment.

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