A simulation study on the measurement of D0-D̄0 mixing parameter y at BESIII*

Huang Bin; Zheng Yang-Heng; Li Wei-Dong; Bian Jian-Ming; Cao Guo-Fu; Cao Xue-Xiang; Chen Shen-Jian; Deng Zi-Yan; Fu Cheng-Dong; Gao Yuan-Ning; He Kang-Lin; He Miao; Hua Chun-Fei; Huang Xing-Tao; Ji Xiao-Bin; Li Hai-Bo; Liang Yu-Tie; Liu Chun-Xiu; Liu Huai-Min; Liu Qiu-Guang; Liu Suo; Liu Ying-Jie; Ma Qiu-Mei; Ma Xiang; Mao Ya-Jun; Mao Ze-Pu; Mo Xiao-Hu; Pan Ming-Hua; Pang Cai-Ying; Ping Rong-Gang; Qin Gang; Qin Ya-Hong; Qiu Jin-Fa; Sun Sheng-Sen; Sun Yong-Zhao; Wang Ji-Ke; Wang Liang-Liang; Wen Shuo-Pin; Wu Ling-Hui; Xie Yu-Guang; Xu Min; Yan Liang; You Zheng-Yun; Yu Guo-Wei; Yuan Chang-Zheng; Yuan Ye; Zhang Chang-Chun; Zhang Jian-Yong; Zhang Xue-Yao; Zhang Yao; Zhu Yong-Sheng; Zhu Zhi-Li; Zou Jia-Heng

doi:10.1088/1674-1137/32/12/002

Chinese Physics C

A simulation study on the measurement of D⁰-⁰ mixing parameter y at BESIII^*

Huang Bin^1,2, Zheng Yang-Heng², Li Wei-Dong¹, Bian Jian-Ming^1,2, Cao Guo-Fu^1,2, Cao Xue-Xiang^1,2, Chen Shen-Jian⁴, Deng Zi-Yan¹, Fu Cheng-Dong^1,3, Gao Yuan-Ning³, He Kang-Lin¹, He Miao^1,2, Hua Chun-Fei⁵, Huang Xing-Tao¹⁰, Ji Xiao-Bin¹, Li Hai-Bo¹, Liang Yu-Tie⁶, Liu Chun-Xiu¹, Liu Huai-Min¹, Liu Qiu-Guang¹, Liu Suo⁷, Liu Ying-Jie¹, Ma Qiu-Mei¹, Ma Xiang^1,2, Mao Ya-Jun⁶, Mao Ze-Pu¹, Mo Xiao-Hu¹, Pan Ming-Hua⁸, Pang Cai-Ying⁸, Ping Rong-Gang¹, Qin Gang^1,2, Qin Ya-Hong⁵, Qiu Jin-Fa¹, Sun Sheng-Sen¹, Sun Yong-Zhao^1,2, Wang Ji-Ke^1,2, Wang Liang-Liang^1,2, Wen Shuo-Pin¹, Wu Ling-Hui¹, Xie Yu-Guang^1,2, Xu Min⁹, Yan Liang^1,2, You Zheng-Yun⁶, Yu Guo-Wei¹, Yuan Chang-Zheng¹, Yuan Ye¹, Zhang Chang-Chun¹, Zhang Jian-Yong¹, Zhang Xue-Yao¹⁰, Zhang Yao¹, Zhu Yong-Sheng¹, Zhu Zhi-Li⁸ and Zou Jia-Heng¹⁰

2008 Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Sciences and the Institute of Modern Physics of the Chinese Academy of Sciences
Chinese Physics C, Volume 32, Number 12 Citation Huang Bin et al 2008 Chinese Phys. C 32 945 DOI 10.1088/1674-1137/32/12/002

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¹ Institute of High Energy Physics, CAS, Beijing 100049, China

² Graduate University of Chinese Academy of Sciences, Beijing 100049,China

³ Tsinghua University, Beijing 100084, China

⁴ Nanjing University, Nanjing 210093, China

⁵ Zhengzhou University, Zhengzhou 450001, China

⁶ Peking University, Beijing 100871, China

⁷ Liaoning University, Shenyang 110036, China

⁸ Guangxi Normal University, Guilin 541004, China

⁹ Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China

¹⁰ Shandong University, Jinan 250100, China

Dates

Received 29 May 2008

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Abstract

We established a method on measuring the D⁰- bar D ⁰ mixing parameter y for BESIII experiment at the BEPCII e⁺e⁺ collider. In this method, the doubly tagged ψ(3770) → D⁰ bar D ⁰ events, with one D decays to CP-eigenstates and the other D decays semileptonically, are used to reconstruct the signals. Since this analysis requires good e/π separation, a likelihood approach, which combines the dE/dx, time of flight and the electromagnetic shower detectors information, is used for particle identification. We estimate the sensitivity of the measurement of y to be 0.007 based on a 20 fb⁻¹ fully simulated MC sample.

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*
Supported by National Natural Science Foundation of China (10491300, 10491303, 10735080), Research and Development Project of Important Scientific Equipment of CAS (H7292330S7), 100 Talents Programme of CAS (U-25, U-54, U-612), and Scientific Research Fund of GUCAS (110200M202)

A simulation study on the measurement of D0-0 mixing parameter y at BESIII*