Observation of a Charged Charmoniumlike Structure in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:mo stretchy="false">(</mml:mo><mml:msup><mml:mi>D</mml:mi><mml:mo>*</mml:mo></mml:msup><mml:msup><mml:mover accent="true"><mml:mi>D</mml:mi><mml:mo stretchy="false">¯</mml:mo></mml:mover><mml:mo>*</mml:mo></mml:msup><mml:msup><mml:mo stretchy="false">)</mml:mo><mml:mo>±</mml:mo></mml:msup><mml:msup><mml:mi>π</mml:mi><mml:mo>∓</mml:mo></mml:msup></mml:math>at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msqrt><mml:mrow><mml:mi>s</mml:mi></mml:mrow></mml:msqrt><mml:mo>=</mml:mo><mml:mn>4.26</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>GeV</mml:mi></mml:mrow></mml:math>
M. Ablikim(Institute of High Energy Physics), M. N. Achasov(Siberian Branch of the Russian Academy of Sciences), O. Albayrak(Carnegie Mellon University), D. Ambrose(University of Rochester), F. F. An(Institute of High Energy Physics), Q. An(University of Science and Technology of China), J. Z. Bai(Institute of High Energy Physics), R. Baldini Ferroli(Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati), Y. Ban(Peking University), J. A. Becker(Ruhr University Bochum), J. V. Bennett(Indiana University Bloomington), M. Bertani(Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati), J. M. Bian(University of Minnesota), E. Boger(Joint Institute for Nuclear Research), O. Bondarenko(University of Groningen), I. Boyko(Joint Institute for Nuclear Research), S. Braun, R. A. Briere(Carnegie Mellon University), V. Bytev(Joint Institute for Nuclear Research), H. Cai(Wuhan University), X. Cai(Institute of High Energy Physics), Ö. Çakır(Ankara University), A. Calcaterra(Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati), G. F. Cao(Institute of High Energy Physics), S. A. Çetin(Doğuş University), J. F. Chang(Institute of High Energy Physics), G. Chelkov(Joint Institute for Nuclear Research), G. Chen(Institute of High Energy Physics), H. S. Chen(Institute of High Energy Physics), J. C. Chen(Institute of High Energy Physics), M. L. Chen(Institute of High Energy Physics), S. J. Chen(Nanjing University), X. R. Chen(Lanzhou University), Y. B. Chen(Institute of High Energy Physics), H. P. Cheng(Huangshan University), Y. P. Chu(Institute of High Energy Physics), D. Cronin-Hennessy(University of Minnesota), H. L. Dai(Institute of High Energy Physics), J. P. Dai(Institute of High Energy Physics), D. Dedovich(Joint Institute for Nuclear Research), Z. Y. Deng(Institute of High Energy Physics), A. Denig(Johannes Gutenberg University Mainz), I. Denysenko(Joint Institute for Nuclear Research), M. Destefanis(International University College of Turin), W. M. Ding(Shandong University), Y. Ding(Liaoning University), L. Y. Dong(Institute of High Energy Physics), M. Y. Dong(Institute of High Energy Physics), S. X. Du(Zhengzhou University), J. Fang(Institute of High Energy Physics), S. S. Fang(Institute of High Energy Physics), L. Fava(Università degli Studi del Piemonte Orientale “Amedeo Avogadro”), C. Q. Feng(University of Science and Technology of China), P. Friedel(Ruhr University Bochum), C. D. Fu(Institute of High Energy Physics), J. Fu(Nanjing University), J. Fu(Joint Institute for Nuclear Research), Y. Gao(Tsinghua University), C. Geng(University of Science and Technology of China), K. Goetzen(GSI Helmholtz Centre for Heavy Ion Research), W. X. Gong(Institute of High Energy Physics), W. Gradl(Johannes Gutenberg University Mainz), M. Greco(International University College of Turin), M. H. Gu(Institute of High Energy Physics), Y. T. Gu(Guangxi University), Y. Guan(Institute of High Energy Physics), A. Q. Guo(Nankai University), L. B. Guo(Nanjing Normal University), Tingting Guo(Nanjing Normal University), Y. P. Guo(Nankai University), Y. L. Han(Institute of High Energy Physics), F. A. Harris(University of Hawaiʻi at Mānoa), K. L. He(Institute of High Energy Physics), M. He(Institute of High Energy Physics), Z. Y. He(Nankai University), T. Held(Ruhr University Bochum), Y. K. Heng(Institute of High Energy Physics), Z. L. Hou(Institute of High Energy Physics), Chenguo Hu(Nanjing Normal University), H. M. Hu(Institute of High Energy Physics), J. F. Hu, J. F. Hu(Institute of High Energy Physics), J. F. Hu(University of Science and Technology of China), G. S. Huang(University of Science and Technology of China), J. S. Huang(Henan Normal University), L. Huang(Institute of High Energy Physics), X. T. Huang(Shandong University), Y. Huang(Nanjing University), T. Hussain(University of the Punjab), C. S. Ji(University of Science and Technology of China), Q. P. Ji(Nankai University), Q. P. Ji(Nankai University), X. B. Ji(Institute of High Energy Physics), X. L. Ji(Institute of High Energy Physics), L. L. Jiang(Institute of High Energy Physics), X. S. Jiang(Institute of High Energy Physics), J. B. Jiao(Shandong University), Z. Jiao(Huangshan University), D. P. Jin(Institute of High Energy Physics), S. Jin(Institute of High Energy Physics), F. Jing(Tsinghua University), N. Kalantar-Nayestanaki(University of Groningen), M. Kavatsyuk(University of Groningen), B. Kloss(Johannes Gutenberg University Mainz), B. Kopf(Ruhr University Bochum), M. Kornicer(University of Hawaiʻi at Mānoa), W. Kuehn, W. Lai(Institute of High Energy Physics), J. S. Lange, M. Lara(Indiana University Bloomington), P. Larin(Johannes Gutenberg University Mainz), M. Leyhe(Ruhr University Bochum), C. H. Li(University of Science and Technology of China), Cheng Li(University of Science and Technology of China), Cui Li(University of Science and Technology of China), D. M. Li(Zhengzhou University), F. Li(Institute of High Energy Physics), Gang Li(Institute of High Energy Physics), H. B. Li(Institute of High Energy Physics), J. C. Li(Institute of High Energy Physics), Ke Li(Hangzhou Normal University), Lei Li(Institute of High Energy Physics), P. R. Li(University of Chinese Academy of Sciences), Q. J. Li(Institute of High Energy Physics), W. D. Li(Institute of High Energy Physics), W. G. Li(Institute of High Energy Physics), X. L. Li(Seoul National University), X. N. Li(Seoul National University), X. Q. Li(Seoul National University), X. R. Li(Seoul National University), Zhibing Li(Sun Yat-sen University), H. Liang(University of Science and Technology of China), Y. F. Liang(Sichuan University), Y. T. Liang(Sichuan University), G. R. Liao(Tsinghua University), X. T. Liao(Institute of High Energy Physics), D. X. Lin(Johannes Gutenberg University Mainz), B. J. Liu(Institute of High Energy Physics), C. L. Liu(Institute of High Energy Physics), C. X. Liu(Institute of High Energy Physics), F. H. Liu(Shanxi University), Fang Liu(Shanxi University), Feng Liu(Shanxi University), H. Liu(Guangxi University), H. B. Liu(Guangxi University), H. H. Liu(Guangxi University), H. M. Liu(Guangxi University), H. W. Liu(Guangxi University), J. P. Liu(Wuhan University), K. Liu(Liaoning University), K. Y. Liu(Liaoning University), L. D. Liu(Peking University), P. L. Liu(Shandong University), Q. Liu(University of Chinese Academy of Sciences), S. B. Liu(University of Science and Technology of China), X. Liu(Lanzhou University), Y. B. Liu(Nankai University), Z. A. Liu(Institute of High Energy Physics), Zhiqiang Liu(Institute of High Energy Physics), Zhiqing Liu(Institute of High Energy Physics), H. Loehner(University of Groningen), X. C. Lou(Institute of High Energy Physics), G. R. Lu(Henan Normal University), H. J. Lü(Huangshan University), J. G. Lü(Institute of High Energy Physics), Xujie Lü(University of Chinese Academy of Sciences), Y. P. Lu(Institute of High Energy Physics), C. L. Luo(Nanjing Normal University), M. X. Luo(Zhejiang University), T. Luo(University of Hawaiʻi at Mānoa), X. L. Luo(Institute of High Energy Physics), M. Lv(Institute of High Energy Physics), F. C.(Liaoning University), H. Lü(Institute of High Energy Physics), Q. M.(Institute of High Energy Physics), Si Ma(Institute of High Energy Physics), T. Ma(Institute of High Energy Physics), X. Y.(Institute of High Energy Physics), F. E. Maas(Johannes Gutenberg University Mainz), M. Maggiora(International University College of Turin), Q. A. Malik(University of the Punjab), Y. J. Mao(Peking University), Z. P. Mao(Institute of High Energy Physics), J. G. Messchendorp(University of Groningen), J. Min(Institute of High Energy Physics), T. J. Min(Institute of High Energy Physics), R. E. Mitchell(Indiana University Bloomington), X. H. Mo(Institute of High Energy Physics), H. Moeini(University of Groningen), C. Morales Morales(Johannes Gutenberg University Mainz), K. Moriya(Indiana University Bloomington), N. Yu. Muchnoi(Siberian Branch of the Russian Academy of Sciences), H. Muramatsu(University of Rochester), Y. Nefedov(Joint Institute for Nuclear Research), I. B. Nikolaev(Siberian Branch of the Russian Academy of Sciences), Z. Ning(Institute of High Energy Physics), S. L. Olsen(Seoul National University), Q. Ouyang(Institute of High Energy Physics), S. Pacetti(University of Perugia), J. W. Park(University of Hawaiʻi at Mānoa), M. Pelizaeus(Ruhr University Bochum), H. P. Peng(University of Science and Technology of China), Κ. Peters(GSI Helmholtz Centre for Heavy Ion Research), J. L. Ping(Nanjing Normal University), R. G. Ping(Institute of High Energy Physics), R. Poling(University of Minnesota), E. Prencipe(Johannes Gutenberg University Mainz), M. Qi(Nanjing University), S. Qian(Institute of High Energy Physics), C. F. Qiao(University of Chinese Academy of Sciences), L. Q. Qin(Shandong University), X. S. Qin(Institute of High Energy Physics), Y. Qin(Peking University), H. R. Qi(Institute of High Energy Physics), J. F. Qiu(Institute of High Energy Physics), K. H. Rashid(University of the Punjab), C. F. Redmer(Johannes Gutenberg University Mainz), G. Rong(Institute of High Energy Physics), X. D. Ruan(Guangxi University), A. Sarantsev(Joint Institute for Nuclear Research), M. Shao(University of Science and Technology of China), C. P. Shen(Beihang University), X. Y. Shen(Institute of High Energy Physics), H. Y. Sheng(Institute of High Energy Physics), M. R. Shepherd(Indiana University Bloomington), W. M. Song(Institute of High Energy Physics), X. Y. Song(Institute of High Energy Physics), S. Spataro(International University College of Turin), B. Spruck, D. H. Sun(Institute of High Energy Physics), G. X. Sun(Institute of High Energy Physics), J. F. Sun(Henan Normal University), S. S. Sun(Institute of High Energy Physics), Y. J. Sun(University of Science and Technology of China), Y. Z. Sun(University of Science and Technology of China), Z. J. Sun(University of Science and Technology of China), Z. T. Sun(University of Science and Technology of China), C. J. Tang(Sichuan University), X. Tang(Institute of High Energy Physics), İ. Tapan(Bursa Uludağ Üni̇versi̇tesi̇), E. H. Thorndike(University of Rochester), D. Toth(University of Minnesota), M. Ullrich, I. Uman(Doğuş University), G. Varner(University of Hawaiʻi at Mānoa), Bing Wang(Institute of High Energy Physics), D. Wang(Peking University), D. Y. Wang(Peking University), K. Wang(Institute of High Energy Physics), L. L. Wang(Institute of High Energy Physics), L. S. Wang(Institute of High Energy Physics), Meng Wang(Shandong University), P. Wang(Institute of High Energy Physics), P. L. Wang(Institute of High Energy Physics), Q. J. Wang(Institute of High Energy Physics), S. G. Wang(Peking University), X. F. Wang(University of Science and Technology of China), Xiaogang Wang(University of Science and Technology of China), Y. D. Wang(Johannes Gutenberg University Mainz), Y. F. Wang(Johannes Gutenberg University Mainz), Y. Q. Wang(Johannes Gutenberg University Mainz), Z. Wang(Institute of High Energy Physics), Z. G. Wang(Institute of High Energy Physics), Ziyi Wang(Institute of High Energy Physics), D. H. Wei(Guangxi Normal University), J. B. Wei(Peking University), P. Weidenkaff(Johannes Gutenberg University Mainz), Q. G. Wen(University of Science and Technology of China), S. P. Wen(Institute of High Energy Physics), M. Werner, U. Wiedner(Ruhr University Bochum), L. H. Wu(Institute of High Energy Physics), Nengyou Wu(Institute of High Energy Physics), S. X. Wu(University of Science and Technology of China), Wei Wu(Nankai University), Z. Wu(Institute of High Energy Physics), L. G. Xia(Tsinghua University), Y. Xia(Hunan University), Z. J. Xiao(Nanjing Normal University), Y. G. Xie(Institute of High Energy Physics), Q. L. Xiu(Institute of High Energy Physics), G. F. Xu(Institute of High Energy Physics), Q. Xu(Hangzhou Normal University), Q. N. Xu(Hangzhou Normal University), X. P. Xu(Soochow University), Z. R. Xu(University of Science and Technology of China), Z.L. Xue(Institute of High Energy Physics), L. Yan(University of Science and Technology of China), W. B. Yan(University of Science and Technology of China), Y. H. Yan(Hunan University), H. X. Yang(Institute of High Energy Physics), Y. Yang(Guangxi Normal University), Y. Yang(Guangxi Normal University), H. Ye(Institute of High Energy Physics), M. Ye(Institute of High Energy Physics), M. H. Ye(Institute of High Energy Physics), B. X. Yu(Institute of High Energy Physics), C. X. Yu(Nankai University), H. W. Yu(Peking University), J. S. Yu(Lanzhou University), S. Yu(Shandong University), C. Z. Yuan(Institute of High Energy Physics), Y. Yuan(Institute of High Energy Physics), A. A. Zafar(University of the Punjab), A. Zallo(Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati), S. L. Zang(Nanjing University), Y. Zeng(Hunan University), B. X. Zhang(Institute of High Energy Physics), B. Y. Zhang(Institute of High Energy Physics), C. Zhang(Institute of High Energy Physics), C. C. Zhang(Institute of High Energy Physics), D. H. Zhang(Institute of High Energy Physics), H. H. Zhang(Sun Yat-sen University), H. Y. Zhang(Sun Yat-sen University), L. Zhang(Institute of High Energy Physics), J. Q. Zhang(Institute of High Energy Physics), J. W. Zhang(Institute of High Energy Physics), J. Y. Zhang(Institute of High Energy Physics), J. Z. Zhang(Institute of High Energy Physics), R. Zhang(University of Chinese Academy of Sciences), S. H. Zhang(Institute of High Energy Physics), X. J. Zhang(Shandong University), X. Y. Zhang(Shandong University), Y. Zhang(Institute of High Energy Physics), Y. H. Zhang(Institute of High Energy Physics), Z. H. Zhang(University of Science and Technology of China), Z. Zhang(University of Science and Technology of China), Z. Y. Zhang(University of Science and Technology of China), Gang Zhao(Institute of High Energy Physics), H. S. Zhao(Institute of High Energy Physics), J. W. Zhao(Institute of High Energy Physics), Lei Zhao(University of Science and Technology of China), Q. Zhao(University of Science and Technology of China), M. G. Zhao(Nankai University), Q. Zhao(Institute of High Energy Physics), S. J. Zhao(Zhengzhou University), T. C. Zhao(Institute of High Energy Physics), X. Zhao(Nanjing University), Y. B. Zhao(Institute of High Energy Physics), Z. Zhao(University of Science and Technology of China), A. Zhemchugov(Joint Institute for Nuclear Research), B. Zheng(University of South China), J. P. Zheng(Institute of High Energy Physics), Y. Zheng(University of Chinese Academy of Sciences), B. Zhong(Nanjing Normal University), L. P. Zhou(Institute of High Energy Physics), X. Zhou(University of Science and Technology of China), Xiaoyu Zhou(University of Science and Technology of China), X. R. Zhou(University of Science and Technology of China), C. Zhu(Institute of High Energy Physics), K. J. Zhu(Institute of High Energy Physics), K. J. Zhu(Institute of High Energy Physics), S. H. Zhu(Institute of High Energy Physics), X. Zhu(Tsinghua University), Y. C. Zhu(University of Science and Technology of China), Y. S. Zhu(University of Science and Technology of China), Z. A. Zhu(Institute of High Energy Physics), J. Zhuang(Institute of High Energy Physics), B. S. Zou(Institute of High Energy Physics), J. H. Zou(Institute of High Energy Physics)
Cited by 299Open Access
Abstract
We study the process e(+)e(-) -> (D* (D) over bar*)(+/-)pi(-/+) at a center-of-mass energy of 4.26 GeV using a 827 pb(-1) data sample obtained with the BESIII detector at the Beijing Electron Positron Collider. Based on a partial reconstruction technique, the Born cross section is measured to be (137 +/- 9 +/- 15) pb. We observe a structure near the (D* (D) over bar*)(+/-) threshold in the pi(-/+) recoil mass spectrum, which we denote as the Z(c)(+/-) (4025). The measured mass and width of the structure are (4026.3 +/- 2.6 +/- 3.7) MeV/c(2) and (24.8 +/- 5.6 +/- 7.7) MeV, respectively. Its production ratio sigma(e(+)e(-) -> Z(c)(+/-)(4025)pi(-/+)-> (D* (D) over bar*)(+/-)pi(-/+)/sigma(e(+)e(-) -> (D* (D) over bar*)(+/-)pi(-/+) is determined to be 0.65 +/- 0.09 +/- 0.06. The first uncertainties are statistical and the second are systematic.
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