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PreprintCC BY 4.0arXiv

NNLO QCD corrections to direct J/ψ production with open charm at B factories

  • Xiangyu Chang
  • Chao Zeng
  • Bin Gong
  • Jian-Xiong Wang
  • Cong Li
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Abstract

We calculate the next-to-next-to-leading-order (NNLO) QCD corrections to direct colour-singlet J/ψ production with open charm at B factories, using nested soft-collinear subtraction for massive partons. At √s=10.6 GeV, mc=1.5 GeV and μR=2mc, we obtain an approximate NNLO cross section of 0.324+0.041−0.066 pb, with scale uncertainties from mc≤μR≤4mc. The total cross section is 18.4% above NLO and exhibits good perturbative convergence through NNLO, with reduced scale dependence. An NLO-based mass extrapolation to mc=1.4 GeV, combined with estimated ψ(2S) feed-down, raises the rate to about $0.59$ pb. The NNLO correction brings the absolute momentum spectrum near its peak closer to Belle's prompt open-charm data, but shifts the angular shape further away from Belle's prompt charm-associated data. The difference in angular shape motivates more precise measurements at Belle II.

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Cite

BibTeXRIS
BibTeX
@misc{chang2026nnlo,
  title = {{NNLO QCD corrections to direct $J/ψ$ production with open charm at B factories}},
  author = {Xiangyu Chang and Chao Zeng and Bin Gong and Jian-Xiong Wang and Cong Li},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.39895},
  eprint = {2610.39895},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.39895},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - NNLO QCD corrections to direct J/ψ production with open charm at B factories
AU  - Xiangyu Chang
AU  - Chao Zeng
AU  - Bin Gong
AU  - Jian-Xiong Wang
AU  - Cong Li
PY  - 2026
DA  - 2026/10/29
PB  - arXiv
DO  - 10.48550/arxiv.2610.39895
UR  - https://arxiv.org/abs/2610.39895
AB  - We calculate the next-to-next-to-leading-order (NNLO) QCD corrections to direct colour-singlet J/ψ production with open charm at B factories, using nested soft-collinear subtraction for massive partons. At √s=10.6 GeV, m_c=1.5 GeV and μ_R=2m_c, we obtain an approximate NNLO cross section of 0.324^+0.041_−0.066 pb, with scale uncertainties from m_c≤μ_R≤4m_c. The total cross section is 18.4% above NLO and exhibits good perturbative convergence through NNLO, with reduced scale dependence. An NLO-based mass extrapolation to m_c=1.4 GeV, combined with estimated ψ(2S) feed-down, raises the rate to about $0.59$ pb. The NNLO correction brings the absolute momentum spectrum near its peak closer to Belle's prompt open-charm data, but shifts the angular shape further away from Belle's prompt charm-associated data. The difference in angular shape motivates more precise measurements at Belle II.
ER  -