Next-to-next-to-leading-order QCD corrections to e⁺e^-→ J/ψ+η_c at B factories

2019/01/24 by Feng Feng, Feng, Feng, Yu Jia +4
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle Detector Development and Performance #Particle physics theoretical and experimental studies

paper · pdf · doi:10.48550/arxiv.1901.08447

openalex publication_date 2019/01/24 · openalex created_date 2019/02/21 · openalex updated_date 2026/07/28

Abstract

Within the nonrelativistic QCD (NRQCD) factorization framework, we compute the long-awaited \mathcal O(α_s²) correction for the exclusive double charmonium production process at B factories, \it i.e., e⁺e^-→ J/ψ+η_c at √(s)=10.58 GeV. For the first time, we confirm that NRQCD factorization does hold at next-to-next-to-leading-order (NNLO) for exclusive double charmonium production. It is found that including the NNLO QCD correction considerably reduces the renormalization scale dependence, and also implies the reasonable perturbative convergence behavior for this process. Our state-of-the-art prediction is consistent with the BaBar measurement within errors.

Related

• Some recent progress in understanding exclusive double charmonium production at B factories
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• Optimized QCD two-loop correction to exclusive double J/ψ production at B factories
• Two-Loop QCD Corrections to C even Bottomonium Exclusive Decays to Double J/ψ