| Autor: |
Huang, Xu-Dong, Gong, Bin, Niu, Rui-Chang, Yu, Huai-Min, Wang, Jian-Xiong |
| Předmět: |
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| Zdroj: |
Journal of High Energy Physics; Feb2024, Vol. 2024 Issue 2, p1-16, 16p |
| Abstrakt: |
In this paper, we study the next-to-next-to-leading-order (NNLO) QCD corrections for the process e+e− → J/ψ + J/ψ at the B factories. By including the NNLO corrections, the cross section turns negative due to the poor convergence of perturbative expansion. Consequently, to obtain a reasonable estimation for the cross section, the square of the amplitude up to NNLO is used. In addition, the contributions from the bottom quark and the light-by-light part, which are usually neglected, are also included. The final cross section is obtained as 1.76 − 1.66 + 2.42 fb at a center-of-mass energy of s = 10.58 GeV. Our result for total cross section and differential cross section could be compared with precise experimental measurement in future at the B factories. [ABSTRACT FROM AUTHOR] |
| Databáze: |
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