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An iterative weighting method to apply ISR correction to e+e hadronic cross-section measurements

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Abstract

Initial State Radiation (ISR) plays an important role in e+e collision experiments such as the BESIII. To correct the ISR effects in measurements of hadronic cross-sections of e+e annihilation, an iterative method that weights simulated ISR events is proposed here to assess the efficiency of event selection and the ISR correction factor for the observed cross-section. The simulated ISR events were generated only once, and the obtained cross-sectional line shape was used iteratively to weigh the same simulated ISR events to evaluate the efficiency and corrections until the results converge. Compared with the method of generating ISR events iteratively, the proposed weighting method provides consistent results, and reduces the computational time and disk space required by a factor of five or more, thus speeding-up e+e hadronic cross-section measurements.

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Acknowledgements

The material presented in this paper is by the authors alone, and has not been reviewed by the BESIII Collaboration. However, we thank our colleagues for allowing us to make use of the BESIII software environment. This work was supported by the National Natural Science Foundation of China, under Grant Nos. U1732105, U1632106, 11947415, and 12047569 and the Research Foundation for Advanced Talents of Nanjing Normal University, under Grant No. 2014102XGQ0085. We also appreciate valuable discussions with Dr. Kai Zhu, Dr. Yuping Guo, and Prof. Changzheng Yuan.

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Correspondence to Liangliang Wang, Bin Zhong or Weimin Song.

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This article can also be found at http://journal.hep.com.cn/fop/EN/10.1007/s11467-021-1085-6.

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Sun, W., Liu, T., Jing, M. et al. An iterative weighting method to apply ISR correction to e+e hadronic cross-section measurements. Front. Phys. 16, 64501 (2021). https://doi.org/10.1007/s11467-021-1085-6

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  • DOI: https://doi.org/10.1007/s11467-021-1085-6

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