1. Tuning and validation of hadronic event generator for R value measurements in the tau-charm region
- Author
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H. B. Hu, Bo Zheng, Guangshun Huang, Xing-Yu Zhou, Y. Z. Li, Z. Gao, Rong-Gang Ping, Wen-Biao Yan, B. Y. Zhang, Xi-An Xiong, and L. Xia
- Subjects
Physics ,Nuclear and High Energy Physics ,010308 nuclear & particles physics ,Electron–positron annihilation ,Hadron ,FOS: Physical sciences ,Astronomy and Astrophysics ,01 natural sciences ,High Energy Physics - Experiment ,Nuclear physics ,High Energy Physics - Phenomenology ,High Energy Physics - Experiment (hep-ex) ,Cross section (physics) ,High Energy Physics - Phenomenology (hep-ph) ,0103 physical sciences ,Radiative transfer ,Charm (quantum number) ,Nuclear Experiment ,010306 general physics ,Instrumentation ,Energy (signal processing) ,Event (probability theory) ,Event generator - Abstract
To measure the $R$ value in an energy scan experiment with $\ee$ collisions, precise calculation of initial state radiation is required in event generators. We present an event generator for this consideration, which incorporates initial state radiation effects up to the second order accuracy, and the radiative correction factor is calculated using the totally hadronic Born cross section. The measured exclusive processes are generated according to their cross sections, while the unknown processes are generated using the LUND Area Law model, and its parameters are tuned with data collected at $\sqrt s=3.65$ GeV. The optimized values are validated with data in the range $\sqrt s=2.2324\sim3.671$ GeV. These optimized parameters are universally valid for event generation below the $D\bar D$ threshold., Comment: 13 pages, 6 figures, 1 table
- Published
- 2016
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