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1. BESIII track reconstruction algorithm based on machine learning

Author

Jia Xiaoqian, Qin Xiaoshuai, Li Teng, Huang Xingtao, Zhang Xueyao, Yin Na, Zhang Yao, and Yuan Ye

Subjects
Physics, QC1-999
Abstract

Track reconstruction is one of the most important and challenging tasks in the offline data processing of collider experiments. For the BESIII detector working in the tau-charm energy region, plenty of efforts were made previously to improve the tracking performance with traditional methods, such as template matching and Hough transform etc. However, for difficult tracking tasks, such as the tracking of low momentum tracks, tracks from secondary vertices and tracks with high noise level, there is still large room for improvement. In this contribution, we demonstrate a novel tracking algorithm based on machine learning method. In this method, a hit pattern map representing the connectivity between drift cells is established using an enormous MC sample, based on which we design an optimal method of graph construction, then an edgeclassifying Graph Neural Network is trained to distinguish the hit-on-track from noise hits. Finally, a clustering method based on DBSCAN and RANSAC is developed to cluster hits from multiple tracks. Track fitting algorithm based on GENFIT2 is also studied to obtain the track parameters, where deterministic annealing filter are implemented to deal with ambiguities and potential noises. The preliminary results on BESIII MC sample presents promising performance, showing potential to apply this method to other trackers based on drift chamber as well, such as the CEPC and STCF detectors under pre-study.

Published
2024
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4. Evidence of a Resonant Structure in the e+e- →π+D0D∗- Cross Section between 4.05 and 4.60 GeV

Author

Ablikim, Medina, Achasov, Mikhail N, Ban, Yong, Hu, Yu, Huang, Guangshun, Huang, Jinshu, Huang, Xingtao, Huang, Xiaozhong, Huang, Zhiling, Hussain, Talab, Ikegami Andersson, Walter, Ji, Quan, Ji, Qingping, Bennett, Dan, Ji, Xiaobin, Ji, Xiaolu, Jiang, Xiaoshan, Jiang, Xingyu, Jiao, Jianbin, Jiao, Zheng, Jin, Dapeng, Jin, Shan, Jin, Yi, Johansson, Tord, Bennett, Jake, Julin, Andy, Kalantar-Nayestanaki, Nasser, Kang, Xiaolin, Kang, Xiaoshen, Kavatsyuk, Myroslav, Ke, Bai-Cian, Khan, Tabassum, Khoukaz, Alfons, Kiese, Patric, Kliemt, Ralf, Berger, Niklaus, Koch, Leonard, Kolcu, Onur Bugra, Kopf, Bertram, Kornicer, Mihajlo, Kuemmel, Miriam, Kuessner, Meike, Kuhlmann, Markus, Kupsc, Andrzej, Kuhn, Wolfgang Kuehn, Lange, Jens Soeren, Bertani, Monica, Lara, Manuel, Larin, Paul, Lavezzi, Lia, Leiber, Stefan, Leithoff, Heinrich, Leng, Chongyang, Li, Cui, Li, Cheng, Li, Demin, Li, Fei, Bettoni, Diego, Li, Fengyun, Li, Gang, Li, Haibo, Li, Huijing, Li, Jiacai, Li, Kaijie, Li, Kang, Li, Ke, Li, Lei, Li, Peilian, Bian, Jianming, Li, Peirong, Li, Qiyun, Li, Teng, Li, Weidong, Li, Weiguo, Li, Xiaoling, Li, Xiaonan, Li, Xue-Qian, Li, Zhibing, Liang, Hao, Bianchi, Fabrizio, Liang, Yongfei, Liang, Yutie, Liao, Guangrui, Lin, Dexu, Liu, Bing, Liu, Beijiang, Liu, Chunxiu, Liu, Dong, Liu, Fuhu, Liu, Fang, Boger, Evgeny, Liu, Feng, Liu, Hongbang, Liu, Huaimin, Liu, Huanhuan, Liu, Huihui, Liu, Jianbei, Liu, Jueping, Liu, Jingyi, Liu, Kai, Liu, Kuiyong, Boyko, Igor, Liu, Ke, Liu, Peilian, Liu, Qian, Liu, Shubin, Liu, Xiang, Liu, Yu-Bin, Liu, Zhenan, Liu, Zhiqing, Long, Yunfei, Lou, Xinchou, Ahmed, Samer Ali Nasher, Briere, Roy, Lu, Hai-jiang, Lu, Junguang, Lu, Yu, Lu, Yunpeng, Luo, Chenglin, Luo, Mingxing, Luo, Xiaolan, Lyu, Xiao-Rui, Ma, Fengcai, Ma, Hailong, Cai, Hao, Ma, Lianliang, Ma, Mingming, Ma, Qiumei, Ma, Tian, Ma, Xuning, Ma, Xiaoyan, Ma, YuMing, Maas, Frank, Maggiora, Marco, Malik, Qadeer Afzal, Cai, Xiao, Mao, Yajun, Mao, Zepu, Marcello, Simonetta, Meng, Zhaoxiao, Messchendorp, Johan, Mezzadri, Giulio, Min, Jian, Min, Tianjue, Mitchell, Ryan, Mo, Xiaohu, Cakir, Orhan, Mo, Yujin, Morales Morales, Cristina, Morello, Gianfranco, Muchnoi, Nikolai Yu, Muramatsu, Hajime, Mustafa, Arber, Nefedov, Yury, Nerling, Frank, Nikolaev, Ivan, Ning, Zhe, Calcaterra, Alessandro, Nisar, Shabana, Niu, Shunli, Niu, Xunyi, Olsen, Stephen L, Ouyang, Qun OuYang, Pacetti, Simone, Pan, Yue, Papenbrock, Michael, Patteri, Piero, Pelizaeus, Marc, Cao, Guofu, Pellegrino, Jacopo, Peng, Haiping, Peters, Klaus, Pettersson, Joachim, Ping, Jialun, Ping, Ronggang, Pitka, Andreas, Poling, Ronald, Prasad, Vindhyawasini, Qi, Hongrong, Cetin, Serkant Ali, Qi, Ming, Qian, Sen, Qiao, Cong-Feng, Qin, Nian, Qin, Xiaoshuai, Qin, Zhonghua, Qiu, Jinfa, Rashid, Khawaja Haris, Redmer, Christoph, Richter, Marvin, Chai, Junying, Ripka, Martin, Rolo, Manuel, Rong, Gang, Rosner, Christoph, Ruan, Xiangdong, Sarantsev, Andrei, Savrie, Mauro Savrié, Schnier, Claudius, Schoenning, Karin, Shao, Ming, Chang, Jinfan, Shen, Chengping, Shen, Peixun, Shen, Xiaoyan, Sheng, Huayi, Song, Jiaojiao, Song, Weimin, Song, Xinying, Sosio, Stefano, Sowa, Cathrina, Spataro, Stefano, Chelkov, Georgy, Sun, Gongxing, Sun, Junfeng, Sun, Liang, Sun, Shengsen, Sun, Xinhua, Sun, Yongjie SUN, Sun, Yankun, Sun, Yongzhao, Sun, Zhijia, Sun, Zhentian, Albrecht, Malte, Chen, Gang, Tang, Changjian, Tang, Guangyi, Tang, Xiao, Tapan, Ilhan, Tiemens, Marcel, Tsednee, Banzragch, Uman, Ismail, Varner, Gary S, Wang, Bin, Wang, Binlong, Chen, Hesheng, Wang, Dayong, Wang, Dan, Wang, Ke, Wang, Liangliang, Wang, Lingshu, Wang, Meng, Wang, Ping, Wang, Peiliang, Wang, Weiping, Chen, Jiangchuan, Wang, Xiongfei, Wang, Yue, Wang, Yadi, Wang, Yifang, Wang, Yaqian, Wang, Zheng, Wang, Zhigang, Wang, Zhihong, Wang, Zhiyong, Wang, Zongyuan, Chen, Mary, Weber, Tobias, Wei, Daihui, Weidenkaff, Peter, Wen, Shuopin, Wiedner, Ulrich, Wolke, Magnus, Wu, Linghui, Wu, Lianjin, Wu, Zhi, Xia, Lei, Chen, Pingliang, Xia, Xin, Xia, Yu, Xiao, Dong, Xiao, Hao, Xiao, Yanjia, Xiao, Zhenjun, Xie, Yuguang, Xie, Yuehong, Xiong, XiAn, Xiu, Qinlei, Chen, Shenjian, Xu, Guofa, Xu, Jingjing, Xu, Lei, Xu, Qingjun, Xu, Qingnian, Xu, Xinping, Yan, Liang, Yan, Wenbiao, Yan, Wencheng, Chen, Yuanbo, Yan, Yonghong, Yang, Haijun, Yang, Hongxun, Yang, Liu, Yang, Youhua, Yang, Yongxu, Yang, Yifan, Ye, Mei, Ye, Minghan, Yin, Junhao, Cibinetto, Gianluigi, You, Zhengyun, Yu, Boxiang, Yu, Chun-Xu, Yuan, Changzheng, Yuan, Ye, Yuncu, Alperen, Zafar, Abrar Ahmad, Zallo, Adriano, Zeng, Yun, Zeng, Zhe, Dai, Hongliang, Zhang, Bingxin, Zhang, Bingyun, Zhang, Changchun, Zhang, Dahua, Zhang, Hong-Hao, Zhang, Hongyu, Zhang, Jin, Zhang, Jielei, Zhang, Jingqing, Zhang, Jiawen, Dai, JianPing, Zhang, Jianyong, Zhang, Jingzhi, Zhang, Kun, Zhang, Lei, Zhang, Shiquan, Zhang, Xueyao, Zhang, Yinhong, Zhang, Yateng, Zhang, Yang, Zhang, Yao, Amoroso, Antonio, Dbeyssi, Alaa, Zhang, Yu, Zhang, Zhenghao, Zhang, Ziping, Zhang, Zhenyu, Zhao, Guang, Zhao, Jingwei, Zhao, Jingyi, Zhao, Jingzhou, Zhao, Lei, Zhao, Ling, Dedovich, Dmitry, Zhao, Minggang, Zhao, Qiang, Zhao, Shujun, Zhao, Tianchi, Zhao, Yubin, Zhao, Zhengguo, Zhemchugov, Alexey, Zheng, Bo, Zheng, Jianping, Zheng, Wenjing, Deng, Ziyan, Zheng, Yangheng, Zhong, Bin, Zhou, Li, Zhou, Xiang, Zhou, Xiaokang, Zhou, Xiaorong, Zhou, Xingyu, Zhou, Yixiong, Zhu, Jiang, Denig, Achim, Zhu, Kai, Zhu, Kejun, Zhu, Shuai, Zhu, Shihai, Zhu, Xianglei, Zhu, yingchun, Zhu, Yongsheng, Zhu, Zi-An, Zhuang, Jian, Zou, Bingsong, Denysenko, Igor, Zou, Jiaheng, BESIII Collaboration, Destefanis, Marco, De Mori, Francesca, Ding, Yong, Dong, Chao, Dong, Jing, An, Fenfen, Dong, Liaoyuan, Dong, Mingyi, Dou, Zhenglei, Du, Shuxian, Duan, Pengfei, Fan, Jingzhou, Fang, Jian, Fang, Shuangshi, Fang, Xin, Fang, Yi, An, Qi, Farinelli, Riccardo, Fava, Luciano, Fegan, Stuart, Feldbauer, Florian, Felici, Giulietto, Feng, Changqing, Fioravanti, Elisa, Fritsch, Miriam, Fu, Chengdong, Gao, Qing, Bai, Yu, Gao, Xinlei, Gao, Yuanning, Gao, Yonggui, Gao, Zhen, Garzia, Isabella, Goetzen, Klaus, Gong, Li, Gong, Wenxuan, Gradl, Wolfgang, Greco, Michela, Bakina, Olga, Gu, Minhao, Gu, Shan, Gu, Yunting, Guo, Aiqiang, Guo, Libo, Guo, Rupan, Guo, Yuping, Haddadi, Zahra, Han, Shuang, Hao, Xiqing, Baldini Ferroli, Rinaldo, Harris, Frederick A, He, Kanglin, Heinsius, Fritz-Herbert, Held, Thomas, Heng, Yuekun, Holtmann, Tobias, Hou, Zhilong, Hu, Chen, Hu, Haiming, and Hu, Tao

Subjects
stability [yield], mass [resonance], annihilation [electron positron], Y(4360), D*2(2460), width [mass], NO, decay, High Energy Physics - Experiment, Physics and Astronomy (all), ddc:530, structure, enhancement, charm, decay, BES, 4.05-4.60 GeV-cms, amplitude analysis, Beijing Stor, electroproduction [psi(4415)], electroproduction [Y(4260)], molecule [charmed meson], colliding beams [electron positron], (pi+ D0) [mass spectrum], charm, statistical, molecule [D anti-D], experimental results
Abstract

The cross section of the process $e^+e^-\to \pi^+D^0D^{*-}$ for center-of-mass energies from 4.05 to 4.60~GeV is measured precisely using data samples collected with the BESIII detector operating at the BEPCII storage ring. Two enhancements are clearly visible in the cross section around 4.23 and 4.40~GeV. Using several models to describe the dressed cross section yields stable parameters for the first enhancement, which has a mass of $4228.6 \pm 4.1 \pm 6.3 \un{MeV}/c^2$ and a width of $77.0 \pm 6.8 \pm 6.3 \un{MeV}$, where the first uncertainties are statistical and the second ones are systematic. Our resonant mass is consistent with previous observations of the $Y(4220)$ state and the theoretical prediction of a $D\bar{D}_1(2420)$ molecule. This result is the first observation of $Y(4220)$ associated with an open-charm final state. Fits with three resonance functions with additional $Y(4260)$, $Y(4320)$, $Y(4360)$, $\psi(4415)$, or a new resonance, do not show significant contributions from either of these resonances. The second enhancement is not from a single known resonance. It could contain contributions from $\psi(4415)$ and other resonances, and a detailed amplitude analysis is required to better understand this enhancement.

Published
2019
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5. Evidence of a resonant structure in the $e^+e^-\to \pi^+D^0D^{*-}$ cross section between 4.05 and 4.60 GeV

Author

Ablikim, Medina, Achasov, Mikhail N, Ahmed, Samer Ali Nasher, Albrecht, Malte, Amoroso, Antonio, An, Fenfen, An, Qi, Bai, Yu, Bakina, Olga, Baldini Ferroli, Rinaldo, Ban, Yong, Bennett, Dan, Bennett, Jake, Berger, Niklaus, Bertani, Monica, Bettoni, Diego, Bian, Jianming, Bianchi, Fabrizio, Boger, Evgeny, Boyko, Igor, Briere, Roy, Cai, Hao, Cai, Xiao, Cakir, Orhan, Calcaterra, Alessandro, Cao, Guofu, Cetin, Serkant Ali, Chai, Junying, Chang, Jinfan, Chelkov, Georgy, Chen, Gang, Chen, Hesheng, Chen, Jiangchuan, Chen, Mary, Chen, Pingliang, Chen, Shenjian, Chen, Yuanbo, Cibinetto, Gianluigi, Dai, Hongliang, Dai, JianPing, Dbeyssi, Alaa, Dedovich, Dmitry, Deng, Ziyan, Denig, Achim, Denysenko, Igor, Destefanis, Marco, De Mori, Francesca, Ding, Yong, Dong, Chao, Dong, Jing, Dong, Liaoyuan, Dong, Mingyi, Dou, Zhenglei, Du, Shuxian, Duan, Pengfei, Fan, Jingzhou, Fang, Jian, Fang, Shuangshi, Fang, Xin, Fang, Yi, Farinelli, Riccardo, Fava, Luciano, Fegan, Stuart, Feldbauer, Florian, Felici, Giulietto, Feng, Changqing, Fioravanti, Elisa, Fritsch, Miriam, Fu, Chengdong, Gao, Qing, Gao, Xinlei, Gao, Yuanning, Gao, Yonggui, Gao, Zhen, Garzia, Isabella, Goetzen, Klaus, Gong, Li, Gong, Wenxuan, Gradl, Wolfgang, Greco, Michela, Gu, Minhao, Gu, Shan, Gu, Yunting, Guo, Aiqiang, Guo, Libo, Guo, Rupan, Guo, Yuping, Haddadi, Zahra, Han, Shuang, Hao, Xiqing, Harris, Frederick A, He, Kanglin, Heinsius, Fritz-Herbert, Held, Thomas, Heng, Yuekun, Holtmann, Tobias, Hou, Zhilong, Hu, Chen, Hu, Haiming, Hu, Tao, Hu, Yu, Huang, Guangshun, Huang, Jinshu, Huang, Xingtao, Huang, Xiaozhong, Huang, Zhiling, Hussain, Talab, Ikegami Andersson, Walter, Ji, Quan, Ji, Qingping, Ji, Xiaobin, Ji, Xiaolu, Jiang, Xiaoshan, Jiang, Xingyu, Jiao, Jianbin, Jiao, Zheng, Jin, Dapeng, Jin, Shan, Jin, Yi, Johansson, Tord, Julin, Andy, Kalantar-Nayestanaki, Nasser, Kang, Xiaolin, Kang, Xiaoshen, Kavatsyuk, Myroslav, Ke, Bai-Cian, Khan, Tabassum, Khoukaz, Alfons, Kiese, Patric, Kliemt, Ralf, Koch, Leonard, Kolcu, Onur Bugra, Kopf, Bertram, Kornicer, Mihajlo, Kuemmel, Miriam, Kuessner, Meike, Kuhlmann, Markus, Kupsc, Andrzej, Kuhn, Wolfgang Kuehn, Lange, Jens Soeren, Lara, Manuel, Larin, Paul, Lavezzi, Lia, Leiber, Stefan, Leithoff, Heinrich, Leng, Chongyang, Li, Cui, Li, Cheng, Li, Demin, Li, Fei, Li, Fengyun, Li, Gang, Li, Haibo, Li, Huijing, Li, Jiacai, Li, Kaijie, Li, Kang, Li, Ke, Li, Lei, Li, Peilian, Li, Peirong, Li, Qiyun, Li, Teng, Li, Weidong, Li, Weiguo, Li, Xiaoling, Li, Xiaonan, Li, Xue-Qian, Li, Zhibing, Liang, Hao, Liang, Yongfei, Liang, Yutie, Liao, Guangrui, Lin, Dexu, Liu, Bing, Liu, Beijiang, Liu, Chunxiu, Liu, Dong, Liu, Fuhu, Liu, Fang, Liu, Feng, Liu, Hongbang, Liu, Huaimin, Liu, Huanhuan, Liu, Huihui, Liu, Jianbei, Liu, Jueping, Liu, Jingyi, Liu, Kai, Liu, Kuiyong, Liu, Ke, Liu, Peilian, Liu, Qian, Liu, Shubin, Liu, Xiang, Liu, Yu-Bin, Liu, Zhenan, Liu, Zhiqing, Long, Yunfei, Lou, Xinchou, Lu, Hai-Jiang, Lu, Junguang, Lu, Yu, Lu, Yunpeng, Luo, Chenglin, Luo, Mingxing, Luo, Xiaolan, Lyu, Xiao-Rui, Ma, Fengcai, Ma, Hailong, Ma, Lianliang, Ma, Mingming, Ma, Qiumei, Ma, Tian, Ma, Xuning, Ma, Xiaoyan, Ma, YuMing, Maas, Frank, Maggiora, Marco, Malik, Qadeer Afzal, Mao, Yajun, Mao, Zepu, Marcello, Simonetta, Meng, Zhaoxiao, Messchendorp, Johan, Mezzadri, Giulio, Min, Jian, Min, Tianjue, Mitchell, Ryan, Mo, Xiaohu, Mo, Yujin, Morales Morales, Cristina, Morello, Gianfranco, Muchnoi, Nikolai Yu, Muramatsu, Hajime, Mustafa, Arber, Nefedov, Yury, Nerling, Frank, Nikolaev, Ivan, Ning, Zhe, Nisar, Shabana, Niu, Shunli, Niu, Xunyi, Olsen, Stephen L, Ouyang, Qun OuYang, Pacetti, Simone, Pan, Yue, Papenbrock, Michael, Patteri, Piero, Pelizaeus, Marc, Pellegrino, Jacopo, Peng, Haiping, Peters, Klaus, Pettersson, Joachim, Ping, Jialun, Ping, Ronggang, Pitka, Andreas, Poling, Ronald, Prasad, Vindhyawasini, Qi, Hongrong, Qi, Ming, Qian, Sen, Qiao, Cong-Feng, Qin, Nian, Qin, Xiaoshuai, Qin, Zhonghua, Qiu, Jinfa, Rashid, Khawaja Haris, Redmer, Christoph, Richter, Marvin, Ripka, Martin, Rolo, Manuel, Rong, Gang, Rosner, Christoph, Ruan, Xiangdong, Sarantsev, Andrei, Savrie, Mauro Savrié, Schnier, Claudius, Schoenning, Karin, Shao, Ming, Shen, Chengping, Shen, Peixun, Shen, Xiaoyan, Sheng, Huayi, Song, Jiaojiao, Song, Weimin, Song, Xinying, Sosio, Stefano, Sowa, Cathrina, Spataro, Stefano, Sun, Gongxing, Sun, Junfeng, Sun, Liang, Sun, Shengsen, Sun, Xinhua, Sun, Yongjie SUN, Sun, Yankun, Sun, Yongzhao, Sun, Zhijia, Sun, Zhentian, Tang, Changjian, Tang, Guangyi, Tang, Xiao, Tapan, Ilhan, Tiemens, Marcel, Tsednee, Banzragch, Uman, Ismail, Varner, Gary S, Wang, Bin, Wang, Binlong, Wang, Dayong, Wang, Dan, Wang, Ke, Wang, Liangliang, Wang, Lingshu, Wang, Meng, Wang, Ping, Wang, Peiliang, Wang, Weiping, Wang, Xiongfei, Wang, Yue, Wang, Yadi, Wang, Yifang, Wang, Yaqian, Wang, Zheng, Wang, Zhigang, Wang, Zhihong, Wang, Zhiyong, Wang, Zongyuan, Weber, Tobias, Wei, Daihui, Weidenkaff, Peter, Wen, Shuopin, Wiedner, Ulrich, Wolke, Magnus, Wu, Linghui, Wu, Lianjin, Wu, Zhi, Xia, Lei, Xia, Xin, Xia, Yu, Xiao, Dong, Xiao, Hao, Xiao, Yanjia, Xiao, Zhenjun, Xie, Yuguang, Xie, Yuehong, Xiong, XiAn, Xiu, Qinlei, Xu, Guofa, Xu, Jingjing, Xu, Lei, Xu, Qingjun, Xu, Qingnian, Xu, Xinping, Yan, Liang, Yan, Wenbiao, Yan, Wencheng, Yan, Yonghong, Yang, Haijun, Yang, Hongxun, Yang, Liu, Yang, Youhua, Yang, Yongxu, Yang, Yifan, Ye, Mei, Ye, Minghan, Yin, Junhao, You, Zhengyun, Yu, Boxiang, Yu, Chun-Xu, Yuan, Changzheng, Yuan, Ye, Yuncu, Alperen, Zafar, Abrar Ahmad, Zallo, Adriano, Zeng, Yun, Zeng, Zhe, Zhang, Bingxin, Zhang, Bingyun, Zhang, Changchun, Zhang, Dahua, Zhang, Hong-Hao, Zhang, Hongyu, Zhang, Jin, Zhang, Jielei, Zhang, Jingqing, Zhang, Jiawen, Zhang, Jianyong, Zhang, Jingzhi, Zhang, Kun, Zhang, Lei, Zhang, Shiquan, Zhang, Xueyao, Zhang, Yinhong, Zhang, Yateng, Zhang, Yang, Zhang, Yao, Zhang, Yu, Zhang, Zhenghao, Zhang, Ziping, Zhang, Zhenyu, Zhao, Guang, Zhao, Jingwei, Zhao, Jingyi, Zhao, Jingzhou, Zhao, Lei, Zhao, Ling, Zhao, Minggang, Zhao, Qiang, Zhao, Shujun, Zhao, Tianchi, Zhao, Yubin, Zhao, Zhengguo, Zhemchugov, Alexey, Zheng, Bo, Zheng, Jianping, Zheng, Wenjing, Zheng, Yangheng, Zhong, Bin, Zhou, Li, Zhou, Xiang, Zhou, Xiaokang, Zhou, Xiaorong, Zhou, Xingyu, Zhou, Yixiong, Zhu, Jiang, Zhu, Kai, Zhu, Kejun, Zhu, Shuai, Zhu, Shihai, Zhu, Xianglei, Zhu, Yingchun, Zhu, Yongsheng, Zhu, Zi-An, Zhuang, Jian, Zou, Bingsong, and Zou, Jiaheng

Subjects
mass spectrum: (pi+ D0), D anti-D: molecule, BES, 4.05-4.60 GeV-cms, amplitude analysis, electron positron: colliding beams, Beijing Stor, electron positron: annihilation, Y(4360), D*2(2460), Y(4260): electroproduction, psi(4415): electroproduction, mass: width, charmed meson: molecule, yield: stability, structure, enhancement, statistical, resonance: mass, experimental results
Abstract

Physical review letters 122(10), 102002 (2019). doi:10.1103/PhysRevLett.122.102002, The cross section of the process e+e-→π+D0D*- for center-of-mass energies from 4.05 to 4.60 GeV is measured precisely using data samples collected with the BESIII detector operating at the BEPCII storage ring. Two enhancements are clearly visible in the cross section around 4.23 and 4.40 GeV. Using several models to describe the dressed cross section yields stable parameters for the first enhancement, which has a mass of 4228.6±4.1±6.3 MeV/c2 and a width of 77.0±6.8±6.3 MeV, where the first uncertainties are statistical and the second ones are systematic. Our resonant mass is consistent with previous observations of the Y(4220) state and the theoretical prediction of a DD¯1(2420) molecule. This result is the first observation of Y(4220) associated with an open-charm final state. Fits with three resonance functions with additional Y(4260), Y(4320), Y(4360), ψ(4415), or a new resonance do not show significant contributions from either of these resonances. The second enhancement is not from a single known resonance. It could contain contributions from ψ(4415) and other resonances, and a detailed amplitude analysis is required to better understand this enhancement., Published by APS, College Park, Md.

Published
2019
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6. Determination of the number of $\psi(3686)$ events at BESIII

Author

Ablikim, Medina, Achasov, Mikhail N, Ai, Xiaocong, Ambrose, Daniel, Amoroso, Antonio, An, Fenfen, An, Qi, Bai, Jingzhi, Baldini Ferroli, Rinaldo, Ban, Yong, Bennett, Jake, Bertani, Monica, Bian, Jianming, Boger, Evgeny, Bondarenko, Olga, Boyko, Igor, Briere, Roy, Cai, Hao, Cai, Xiao, Cakir, Orhan, Calcaterra, Alessandro, Cao, Guofu, Cetin, Serkant Ali, Chang, Jinfan, Chelkov, Georgy, Chen, Gang, Chen, Hesheng, Chen, Jiangchuan, Chen, Mary, Chen, Shenjian, Chen, Xuan, Chen, Xurong, Chen, Yuanbo, Chu, Xinkun, Chu, Yuanping, Cronin-Hennessy, Daniel, Dai, Hongliang, Dai, Jianping, Dedovich, Dmitry, Deng, Ziyan, Denig, Achim, Denysenko, Igor, Destefanis, Marco, Ding, Yong, Dong, Chao, Dong, Jing, Dong, Liaoyuan, Dong, Mingyi, Du, Shuxian, Fan, Jingzhou, Fang, Jian, Fang, Shuangshi, Fang, Yi, Fava, Luciano, Feldbauer, Florian, Feng, Changqing, Fu, Chengdong, Gao, Qing, Gao, Yuanning, Goetzen, Klaus, Gong, Wenxuan, Gradl, Wolfgang, Greco, Michela, Gu, Minhao, Gu, Yunting, Guan, Yinghui, Guo, Aiqiang, Guo, Yuping, Han, YanLiang, Harris, Frederick A, He, Kanglin, He, Miao, Held, Thomas, Heng, Yuekun, Hou, Zhilong, Hu, Haiming, Hu, Tao, Huang, Guangshun, Huang, Jinshu, Huang, Liang, Huang, Xingtao, Hussain, Talab, Ji, Quan, Ji, Qingping, Ji, Xiaobin, Ji, Xiaolu, Jiang, Lili, Jiang, Xiaoshan, Jiao, Jianbin, Jiao, Zheng, Jin, Dapeng, Jin, Shan, Johansson, Tord, Kalantar-Nayestanaki, Nasser, Kang, Xiaolin, Kang, Xiaoshen, Kavatsyuk, Myroslav, Kloss, Benedikt, Kopf, Bertram, Kornicer, Mihajlo, Kupsc, Andrzej, K\'Uhn, Wolfgang Kuehn, Lai, Wei, Lange, Jens Soeren, Lara, Manuel, Larin, Paul, Li, Chunhua, Li, Cheng, Li, Demin, Li, Fei, Li, Gang, Li, Haibo, Li, Jiacai, Li, Kang, Li, Ke, Li, Lei, Li, Peirong, Li, Qiuju, Li, Weidong, Li, Weiguo, Li, Xiaoling, Li, Xiaonan, Li, Xue-Qian, Li, Xiurong, Li, Zhibing, Liang, Hao, Liang, Yongfei, Liang, Yutie, Liao, Guangrui, Lin, Dexu, Liu, Beijiang, Liu, Chunxiu, Liu, Fuhu, Liu, Fang, Liu, Feng, Liu, Hongbang, Liu, Huaimin, Liu, Huihui, Liu, Jie, Liu, Jueping, Liu, Kai, Liu, Kuiyong, Liu, Qian, Liu, Shubin, Liu, Xiang, Liu, Yu-Bin, Liu, Zhenan, Liu, Zhiqiang, Liu, Zhiqing, Loehner, Herbert, Lou, Xinchou, Lu, Hai-Jiang, Lu, Junguang, Lu, Yu, Lu, Yunpeng, Luo, Chenglin, Luo, Mingxing, Luo, Tao, Luo, Xiaolan, Lv, Meng, Lyu, Xiao-Rui, Ma, Fengcai, Ma, Hailong, Ma, Qiumei, Ma, Si, Ma, Tian, Ma, Xiaoyan, Maas, Frank, Maggiora, Marco, Mao, Yajun, Mao, Zepu, Messchendorp, Johan, Min, Jian, Min, Tianjue, Mitchell, Ryan, Mo, Xiaohu, Mo, Yujin, Morales Morales, Cristina, Moriya, Kei, Muchnoi, Nikolai Yu, Muramatsu, Hajime, Nefedov, Yury, Nikolaev, Ivan, Ning, Zhe, Nisar, Shabana, Niu, Shunli, Niu, Xunyi, Olsen, Stephen L, Ouyang, Qun OuYang, Pacetti, Simone, Pelizaeus, Marc, Peng, Haiping, Peters, Klaus, Ping, Jialun, Ping, Ronggang, Poling, Ronald, Qi, Ming, Qian, Sen, Qiao, Cong-Feng, Qin, Xiaoshuai, Qin, Zhonghua, Qiu, Jinfa, Rashid, Khawaja Haris, Redmer, Christoph, Ripka, Martin, Rong, Gang, Sarantsev, Andrei, Schoenning, Karin, Shan, Wei, Shao, Ming, Shen, Chengping, Shen, Xiaoyan, Sheng, Huayi, Shepherd, Matthew, Song, Weimin, Song, Xinying, Sosio, Stefano, Spataro, Stefano, Sun, Gongxing, Sun, Junfeng, Sun, Shengsen, Sun, Yongjie SUN, Sun, Yongzhao, Sun, Zhijia, Tang, Changjian, Tang, Xiao, Tapan, Ilhan, Thorndike, Ed, Toth, Derrick, Uman, Ismail, Varner, Gary S, Wang, Bin, Wang, Dong, Wang, Dayong, Wang, Ke, Wang, Liangliang, Wang, Lingshu, Wang, Meng, Wang, Ping, Wang, Peiliang, Wang, Qingjuan, Wang, Wei, Wang, Xiongfei, Wang, Yadi, Wang, Yifang, Wang, Yaqian, Wang, Zheng, Wang, Zhigang, Wang, Zhiyong, Wei, Daihui, Weidenkaff, Peter, Wen, Shuopin, Wiedner, Ulrich, Wolke, Magnus, Wu, Linghui, Wu, Zhi, Xia, Ligang, Xia, Yu, Xiao, Dong, Xiao, Zhenjun, Xie, Yuguang, Xiu, Qinlei, Xu, Guofa, Xu, Lei, Xu, Qingjun, Xu, Qingnian, Xu, Xinping, Yan, Wenbiao, Yan, Yonghong, Yang, Hongxun, Yang, Ying, Yang, Yongxu, Ye, Hua, Ye, Mei, Ye, Minghan, Yu, Boxiang, Yu, Chun-Xu, Yu, Jiesheng, Yuan, Changzheng, Yuan, Ye, Zafar, Abrar Ahmad, Zeng, Yun, Zhang, Bingxin, Zhang, Bingyun, Zhang, Changchun, Zhang, Dahua, Zhang, Hong-Hao, Zhang, Hongyu, Zhang, Jiajia, Zhang, Jingqing, Zhang, Jiawen, Zhang, Jianyong, Zhang, Jingzhi, Zhang, Lei, Zhang, Rui, Zhang, Shuhua, Zhang, Xiaojie, Zhang, Xueyao, Zhang, Yinhong, Zhang, Yao, Zhang, Zhenghao, Zhang, Ziping, Zhang, Zhenyu, Zhao, Guang, Zhao, Jingwei, Zhao, Jingzhou, Zhao, Lei, Zhao, Ling, Zhao, Minggang, Zhao, Qiang, Zhao, Qingwang, Zhao, Shujun, Zhao, Tianchi, Zhao, Yubin, Zhao, Zhengguo, Zhemchugov, Alexey, Zheng, Bo, Zheng, Jianping, Zheng, Yangheng, Zhong, Bin, Zhou, Li, Zhou, Xiang, Zhou, Xiaokang, Zhou, Xiaorong, Zhou, Xingyu, Zhu, Kai, Zhu, Kejun, Zhu, Xianglei, Zhu, Yingchun, Zhu, Yongsheng, Zhu, Zi-An, Zhuang, Jian, Zou, Bingsong, and Zou, Jiaheng

Subjects
psi(3685): electroproduction, cross section: hadronic, BES, electron positron: colliding beams, Beijing Stor, electron positron: annihilation, numerical calculations: Monte Carlo, statistical, experimental results
Abstract

Chinese physics / C High energy physics and nuclear physics C C42(2), 023001 (2018). doi:10.1088/1674-1137/42/2/023001, The numbers of ψ(3686) events accumulated by the BESIII detector for the data taken during 2009 and 2012 are determined to be and , respectively, by counting inclusive hadronic events, where the uncertainties are systematic and the statistical uncertainties are negligible. The number of events for the sample taken in 2009 is consistent with that of the previous measurement. The total number of ψ(3686) events for the two data taking periods is ., Published by IOP Publ., Bristol [u.a.]

Published
2018
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7. Study of the electromagnetic transitions $J/\psi \rightarrow P l^+l^-$ and probe dark photon

Author

Fu, Jinlin, Li, Hai-Bo, Qin, Xiaoshuai, and Yang, Mao-Zhi

Subjects
High Energy Physics - Phenomenology, High Energy Physics::Experiment, High Energy Physics - Experiment
Abstract

We study the electromagnetic Dalitz decay modes of $J/\psi \rightarrow P l^+l^-$ ($P= \pi^0$, $\eta$ or $\eta^\prime$). In these decays, the lepton pairs are formed by internal conversion of an intermediate virtual photon with invariant mass $m_{l^+l^-}$. Study of the effective-mass spectrum of the $l^+l^-$ will shed light on the dynamic transition form factor $F_{J/\psi P}(q^2)$ ($q^2 = m^2_{l^+l^-}$), which characterizes the electromagnetic structure arising at the vertex of the transition $J/\psi$ to pseudoscalars. We also discuss the direct productions of a GeV scale vector $U$ boson in these processes $J/\psi \rightarrow PU$ ($U\rightarrow l^+l^-$). It is responsible for mediating a new $U(1)_d$ interaction, as recently exploited in the context of weakly interacting massive particle dark matter. In this paper, we firstly use the usual pole approximation for the form factor to estimate the decay rate of $J/\psi \rightarrow P l^+l^-$ in the standard model. Then the reach of searching for the dark photon is estimated. We suggest that these Dalitz decays can be used to search for the light $U$ boson in the BESIII experiment with a huge $J/\psi$ data set., Comment: 6 pages, 3 figure, add two more figures, more discussions

Published
2011

8. STUDY OF THE ELECTROMAGNETIC TRANSITIONS J/ψ → P l+l- AND PROBE DARK PHOTON.

Author

FU, JINLIN, LI, HAI-BO, QIN, XIAOSHUAI, and YANG, MAO-ZHI

Subjects
PHOTONS, ELECTROMAGNETISM, PHASE transitions, RADIOACTIVE decay, DARK matter, PHOSPHORUS, MASS spectrometry, STANDARD model (Nuclear physics)
Abstract

We study the electromagnetic Dalitz decay modes of J/ψ → P l+l- (P = π0, η or η′). In these decays, the lepton pairs are formed by internal conversion of an intermediate virtual photon with invariant mass ml+l-. Study of the effective-mass spectrum of the l+l- will shed light on the dynamic transition form factor , which characterizes the electromagnetic structure arising at the vertex of the transition J/ψ to pseudoscalars. We also discuss the direct productions of a GeV scale vector U boson in these processes J/ψ → PU (U → l+l-). It is responsible for mediating a new U(1)d interaction, as recently exploited in the context of weakly interacting massive particle dark matter. In this paper, we firstly use the usual pole approximation for the form factor to estimate the decay rate of J/ψ → P l+l- in the Standard Model. Then the reach of searching for the dark photon is estimated. We suggest that these Dalitz decays can be used to search for the light U boson in the BESIII experiment with a huge J/ψ data set. [ABSTRACT FROM AUTHOR]

Published
2012
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9. Design and development of STCF offline software.

Author

Ai, Xiaocong, Huang, Xingtao, Li, Teng, Qi, Binbin, and Qin, Xiaoshuai

Subjects
*ELECTRONIC data processing, *COLLIDERS (Nuclear physics), *DIGITIZATION, *DATA analysis, *LUMINOSITY
Abstract

The Super Tau-Charm Facility (STCF) is a next-generation positron–electron collider experiment, designed to study various physics topics in the tau-charm energy region. The designed peak luminosity of STCF is 0.5×1035cm−2s−1, which is almost two orders of magnitude higher than the current tau-charm factory, BESIII. To implement the offline data processing tasks, as well as tackling the great challenge posed by the huge data volume, the offline software of STCF (OSCAR) is designed to implement the detector simulation, digitization, calibration, reconstruction as well as to provide a common platform for data analysis. This paper presents the status and progress of the OSCAR system, including the design, implementation as well as the preliminary performance of the core software, detector simulation, digitization and background mixing and reconstruction algorithms for all sub-detectors. [ABSTRACT FROM AUTHOR]

Published
2024
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