Next-to-leading-order QCD study of e⁺e^- → η_c + cc̅ at B factories

@misc{zhang2026nexttoleadingorder,
  title = {{Next-to-leading-order QCD study of $e^+e^- \to η_c + c\barc$ at $B$ factories}},
  author = {Lu-Yao Zhang and Xu-Chang Zheng and Xing-Gang Wu},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.39718},
  eprint = {2610.39718},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.39718},
}

TY  - UNPB
TI  - Next-to-leading-order QCD study of e^+e^- → η_c + cc̅ at B factories
AU  - Lu-Yao Zhang
AU  - Xu-Chang Zheng
AU  - Xing-Gang Wu
PY  - 2026
DA  - 2026/10/29
PB  - arXiv
DO  - 10.48550/arxiv.2610.39718
UR  - https://arxiv.org/abs/2610.39718
AB  - We study the process e^+e^- → γ^∗ → η_c + cc̅ + X at next-to-leading order (NLO) in QCD within the framework of nonrelativistic QCD (NRQCD) factorization, retaining the color-singlet contribution at leading order in the heavy-quark relative velocity v. At the e^+e^- collision energy √s = 10.6 GeV, with m_c = 1.5 GeV and μ_R = 2m_c, the direct cross section increases from 58.7 fb at leading order (LO) to 118 fb at NLO, corresponding to a K factor of approximately $2.0$. Including the radiative feed-down contributions of the J/ψ and h_c(1P) states yields an estimated prompt production rate of 131 fb. The NLO corrections substantially enhance both the angular and momentum distributions, while the momentum spectrum retains a similar overall profile. These results establish an NLO color-singlet baseline for η_c production associated with open charm at Belle II, complementary to studies of charmonium production in hadronic collisions.
ER  -