Chinese Physics C > 2016, Vol. 40 > Issue(11): 113002 DOI: 10.1088/1674-1137/40/11/113002

Tuning and validation of hadronic event generator forRvalue measurements in the tau-charm region

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

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Abstract：
To measure the Rvalue 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 D Dthreshold.
- event generator,
- R value

References

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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 Rvalue measurements in the tau-charm region[J]. Chinese Physics C, 2016, 40(11): 113002. doi: 10.1088/1674-1137/40/11/113002

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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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1.
沈阳化工大学材料科学与工程学院沈阳 110142

Tuning and validation of hadronic event generator forRvalue measurements in the tau-charm region

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Tuning and validation of hadronic event generator forRvalue measurements in the tau-charm region

Corresponding author:Rong-Gang Ping,

Corresponding author:Bo Zheng,

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