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Ai, X. C.; Amoroso, A.; Bortone, A.; Briere, R. A.; Calcaterra, A.; Chen, C.; Chen, G.; Chen, H. S.; Chen, M. L.; Cibinetto, G.; Dai, J. P.; De Mori, F.; Fang, Y. Q.; Felici, G.; Gao, H.; Garzia, I.; Guan, C. Y.; Guo, A. Q.; Guo, L. B.; Gutierrez, J.; Harris, F. A.; He, K. K.; He, K. L.; Holtmann, T.; Hu, H. M.; Hu, T.; Huang, L. Q.; Hölzken, F.; Janchiv, S.; Ji, Q.; Ji, X. L.; Li, C.; Li, F.; Li, H. N.; Li, Hui; Li, P. R.; Li, T.; Li, X. L.; Li, Z. J.; Lin, T.; Liu, Huanhuan; Liu, Huihui; Liu, J. Y.; Liu, P. L.; Liu, Z. D.; Luo, M. X.; Ma, J. L.; Ma, X. Y.; Maas, F. E.; Mo, X. H.; Pan, Y.; Patteri, P.; Qi, H.; Qin, L. Q.; Ren, K. J.; Rong, G.; Shangguan, J. F.; Shi, J. L.; Song, J. J.; Sosio, S.; Spataro, S.; Sun, Y. J.; Sun, Z. T.; Tang, M.; Tang, Y. A.; Tat, M.; Wang, B.; Wang, Bo; Wang, F.; Wang, H. J.; Wang, J. P.; Wang, Y. L.; Wang, Z. L.; Wang, Z. Y.; Wilkinson, G.; Wu, Y.; Wu, Y. J.; Xiao, Y. L.; Xu, H. Y.; Xu, M.; Xu, Q. N.; Xu, Z. S.; Yang, H. J.; Ye, M. H.; Yuan, Z. Y.; Zeng, S. H.; Zhang, B. X.; Zhang, J. X.; Zhang, J. Y.; Zhang, P.; Zhang, Shulei; Zhang, X. M.; Zhao, G.; Zhao, Z. G.; Zheng, J. P.; Zheng, W. J.; Zhou, X. R.; Zhu, L. X.; Zhu, T. J.; Zhu, Z. A.
Physical review letters, 7/2024, Volume: 133, Issue: 2Journal Article
Using data samples collected with the BESIII detector operating at the BEPCII storage ring, the cross section of the inclusive process e + e − → η + X , normalized by the total cross section of e + e − → hadrons , is measured at eight center-of-mass energy points from 2.0000 to 3.6710 GeV. These are the first measurements with momentum dependence in this energy region. Our measurement shows a significant discrepancy compared to the existing fragmentation functions. To address this discrepancy, a new QCD analysis is performed at the next-to-next-to-leading order with hadron mass corrections and higher twist effects, which can explain both the established high-energy data and our measurements reasonably well. Published by the American Physical Society 2024
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