https://doi.org/10.1051/epjconf/201921807005
Event Generators for Multi Hadronic Production in e+e− Collisions
1
Institute of High Energy Physics, Beijing 100049, People’s Republic of China
2
University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
3
University of Science and Technology of China, Hefei 230026, China
* e-mail: pingrg@ihep.ac.cn
** e-mail: gaozhen@mail.ustc.edu.cn
Published online: 18 October 2019
An event generator for multi hadron production is presented for measuring the R value in the τ-charm energy region with e+e− collisions. The initial state radiation effects are considered up to second order accuracy, and the radiative correction factor is calculated with hadronic Born cross sections. The established exclusive processes are generated according to their measured cross sections, while the missing processes are generated using the LUND Area Law model, and its parameters are tuned with data collected at 
= 3.08 GeV. The optimized values are validated with data in the range 
= 2.2324 ∼ 3.671 GeV. These optimized parameters are universally valid for event generation below the DD¯threshold.
© The Authors, published by EDP Sciences, 2019
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
