Tuning and validation of hadronic event generator for R value measurements in the tau-charm region

  • To measure the R value in an energy scan experiment with e+e- collisions, precise calculation of initial state radiation is required in the event generators. We present an event generator for this consideration, which incorporates initial state radiation effects up to second order accuracy. 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 √s=3.65 GeV. The optimized values are validated with data in the range √s=2.2324-3.671 GeV. These optimized parameters are universally valid for event generation below the DD threshold.
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Rong-Gang Ping, Xi-An Xiong, Lei Xia, Zhen Gao, Ying-Tian Li, Xing-Yu Zhou, Bing-Xin Zhang, Bo Zheng, Wen-Biao Yan, Hai-Ming Hu and Guang-Shun Huang. Tuning and validation of hadronic event generator for R value measurements in the tau-charm region[J]. Chinese Physics C, 2016, 40(11): 113002. doi: 10.1088/1674-1137/40/11/113002
Rong-Gang Ping, Xi-An Xiong, Lei Xia, Zhen Gao, Ying-Tian Li, Xing-Yu Zhou, Bing-Xin Zhang, Bo Zheng, Wen-Biao Yan, Hai-Ming Hu and Guang-Shun Huang. Tuning and validation of hadronic event generator for R value measurements in the tau-charm region[J]. Chinese Physics C, 2016, 40(11): 113002.  doi: 10.1088/1674-1137/40/11/113002 shu
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Received: 2016-05-10
Revised: 2016-07-13
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    Supported by National Natural Science Foundation of China (11175146, 11375205, 11575077, 11335008, 11565006), Large Science Setup of Joint Foundation (10979059), and 100 Talents Program of CAS

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Tuning and validation of hadronic event generator for R value measurements in the tau-charm region

    Corresponding author: Rong-Gang Ping,
    Corresponding author: Bo Zheng,
  • 1.  Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • 2.  University of Science and Technology of China, Hefei 230026, China
  • 3.  University of South China, Hengyang, 421001, China
Fund Project:  Supported by National Natural Science Foundation of China (11175146, 11375205, 11575077, 11335008, 11565006), Large Science Setup of Joint Foundation (10979059), and 100 Talents Program of CAS

Abstract: To measure the R value in an energy scan experiment with e+e- collisions, precise calculation of initial state radiation is required in the event generators. We present an event generator for this consideration, which incorporates initial state radiation effects up to second order accuracy. 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 √s=3.65 GeV. The optimized values are validated with data in the range √s=2.2324-3.671 GeV. These optimized parameters are universally valid for event generation below the DD threshold.

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