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Ablikim, Medina ; Achasov, Mikhail N. ; Adlarson, Patrik ; Ahmed, Samer ; Albrecht, Malte ; Aliberti, Riccardo ; Amoroso, Antonio ; An, M. R. ; An, Qi ; Bai, Xuhong ; Bai, Yu ; Bakina, Olga ; Baldini Ferroli, Rinaldo ; Balossino, Ilaria ; Ban, Yong ; Begzsuren, Khurelbaatar ; Berger, Niklaus ; Bertani, Monica ; Bettoni, Diego ; Bianchi, Fabrizio ; Biernat, Jacek ; Bloms, Johannes ; Bortone, Alberto ; Boyko, Igor R. ; Briere, Roy A. ; Cai, H. ; Cai, Xiao ; Calcaterra, Alessandro ; Cao, G. F. ; Cao, Ning ; Çetin, Serkant Ali ; Chang, Jinfan ; Chang, W. L. ; Chelkov, Gueorgui A. ; Chen, D. Y. ; Chen, G. ; Chen, Hesheng ; Chen, M. L. ; Chen, S. J. ; Chen, X. R. ; Chen, Yuanbo ; Chen, Z. J. ; Cheng, W. S. ; Cibinetto, Gianluigi ; Cossio, Fabio ; Cui, X. F. ; Dai, Hongliang ; Dai, Xinchen ; Dbeyssi, Alaa ; Boer, Remco E. de ; Dedovich, Dmitri V. ; Deng, Ziyan ; Denig, Achim ; Denysenko, Igor ; Destefanis, Marco Giovanni Maria ; De Mori, Francesca ; Ding, Y. ; Dong, C. ; Dong, J. ; Dong, Liaoyuan ; Dong, Mingyi ; Dong, X. ; Du, Shuxian ; Fan, Y. L. ; Fang, J. ; Fang, Shuangshi ; Fang, Y. ; Farinelli, Riccardo ; Fava, Luciano ; Feldbauer, Florian ; Felici, Giulietto ; Feng, C. Q. ; Feng, J. H. ; Fritsch, Miriam ; Fu, Chengdong ; Gao, Y. ; Gao, Y. ; Gao, Y. ; Gao, Y. G. ; Garzia, I. ; Ge, Panting ; Geng, Cong ; Gersabeck, Evelina ; Gilman, Alexander ; Goetzen, Klaus ; Gong, L. ; Gong, Wenxuan ; Gradl, Wolfgang ; Greco, M. ; Gu, L. M. ; Gu, Minhao ; Gu, S. ; Gu, Y. T. ; Guan, C. Y. ; Guo, Aiqiang ; Guo, L. B. ; Guo, R. P. ; Guo, Yuping ; Guskov, Alexey ; Han, T. T. ; Han, W. Y. ; Hansson, J. ; Hao, Xiqing ; Harris, F. A. ; Hüsken, Nils ; He, K. L. ; Heinsius, Fritz-Herbert ; Heinz, C. H. ; Held, T. ; Heng, Yuekun ; Herold, Christoph ; Himmelreich, Mathilde ; Holtmann, Tobias ; Hou, Y. R. ; Hou, Zhilong ; Hu, Haiming ; Hu, J. F. ; Hu, T. ; Hu, Y. ; Huang, G. S. ; Huang, L. Q. ; Huang, X. T. ; Huang, Y. P. ; Huang, Z. ; Hussain, Tahir ; Ikegami Andersson, Walter ; Imoehl, William ; Irshad, M. ; Jaeger, S. ; Janchiv, S. ; Ji, Quan ; Ji, Qingping ; Ji, X. B. ; Ji, X. L. ; Ji, Y. Y. ; Jiang, H. B. ; Jiang, Xiaoshan ; Jiao, J. B. ; Jiao, Z. ; Jin, Shan ; Jin, Y. ; Johansson, Tord ; Kalantar-Nayestanaki, Nasser ; Kang, X. S. ; Kappert, Rosa ; Kavatsyuk, Myroslav O. ; Ke, Bai-Cian ; Keshk, Iman ; Khoukaz, Alfons ; Kiese, P. ; Kiuchi, Ryuta ; Kliemt, Ralf ; Koch, Leonard ; Kolcu, Onur Bugra ; Kopf, Bertram ; Kuemmel, M. ; Küßner, Meike ; Kupsc, Andrzej ; Kurth, M. G. ; Kühn, Wolfgang ; Lane, John Jake ; Lange, Jens Sören ; Larin, Paul ; Lavania, Anita ; Lavezzi, Lia ; Lei, Z. H. ; Leithoff, H. ; Lellmann, Max ; Lenz, Thomas ; Li, C. ; Li, Chunhua ; Li, Cheng ; Li, D. M. ; Li, F. ; Li, G. ; Li, H. ; Li, H. ; Li, Haibo ; Li, Huijing ; Li, Huijing ; Li, J. L. ; Li, J. Q. ; Li, J. S. ; Li, Ke ; Li, L. K. ; Li, Lei ; Li, Peirong ; Li, S. Y. ; Li, Weidong ; Li, Weiguo ; Li, X. H. ; Li, X. L. ; Li, Xiaoyu ; Li, Z. Y. ; Liang, H. ; Liang, H. ; Liang, H. ; Liang, Y. F. ; Liang, Y. T. ; Liao, G. R. ; Liao, L. Z. ; Libby, J. ; Lin, C. X. ; Liu, B. J. ; Liu, C. X. ; Liu, D. ; Liu, Fu-Hu ; Liu, Fang ; Liu, Feng ; Liu, H. B. ; Liu, H. M. ; Liu, Huanhuan ; Liu, Huihui ; Liu, J. B. ; Liu, J. L. ; Liu, J. Y. ; Liu, K. ; Liu, K. Y. ; Liu, Ke ; Liu, L. ; Liu, Meihong ; Liu, P. L. ; Liu, Q. ; Liu, Q. ; Liu, S. B. ; Liu, Shuai ; Liu, T. ; Liu, Weimin ; Liu, X. ; Liu, Y. ; Liu, Y. B. ; Liu, Zhen-An ; Liu, Zhiqing ; Lou, Xinchou ; Lu, F. X. ; Lu, F. X. ; Lu, H. J. ; Lu, J. D. ; Lu, Junguang ; Lu, X. L. ; Lu, Y. ; Lu, Yunpeng ; Luo, Chenglin ; Luo, M. X. ; Luo, P. W. ; Luo, Tao ; Luo, X. L. ; Lusso, S. ; Lyu, Xiao-Rui ; Ma, Fengcai ; Ma, Hailong ; Ma, Lianliang ; Ma, M. M. ; Ma, Qiumei ; Ma, R. Q. ; Ma, R. T. ; Ma, X. X. ; Ma, Xiaoyan ; Maas, Frank E. ; Maggiora, Marco ; Maldaner, Stephan ; Malde, Sneha ; Malik, Qadeer Afzal ; Mangoni, Alessio ; Mao, Yajun ; Mao, Zepu ; Marcello, Simonetta ; Meng, Z. X. ; Messchendorp, Johannes Gerhardus ; Mezzadri, Giulio ; Min, T. J. ; Mitchell, Ryan Edward ; Mo, Xiaohu ; Mo, Y. J. ; Muchnoi, Nikolai Yu. ; Muramatsu, H. ; Nakhoul, Simon ; Nefedov, Yury ; Nerling, Frank ; Nikolaev, Ivan Borisovich ; Ning, Z. ; Nisar, Shabana ; Olsen, Stephen L. ; Ouyang, Qun ; Pacetti, Simone ; Pan, X. ; Pan, Y. ; Pathak, A. ; Patteri, P. ; Pelizäus, Marc ; Peng, H. P. ; Peters, Klaus ; Ping, J. L. ; Ping, R. G. ; Poling, Ronald ; Prasad, Vindhyawasini ; Qi, H. ; Qi, H. R. ; Qi, K. H. ; Qi, Ming ; Qi, T. Y. ; Qi, T. Y. ; Qian, S. ; Qian, W. B. ; Qian, Z. ; Qiao, Congfeng ; Qin, L. Q. ; Qin, X. P. ; Qin, X. S. ; Qin, Zhonghua ; Qiu, Jinfa ; Qu, S. Q. ; Rashid, K. H. ; Ravindran, Krishnakumar ; Redmer, Christoph Florian ; Rivetti, Angelo ; Rodin, Viktor ; Da Rocha Rolo, Manuel Dionisio ; Rong, Gang ; Rosner, Christoph ; Rump, Marcel Andre ; Sang, H. S. ; Sarantsev, Andrei V. ; Schelhaas, Yasemin ; Schnier, Claudius ; Schönning, Karin ; Scodeggio, Marco ; Shan, D. C. ; Shan, Wei ; Shan, Xinyu ; Shangguan, J. F. ; Shao, M. ; Shen, C. P. ; Shen, P. X. ; Shen, X. Y. ; Shi, Huangchao ; Shi, Rongsheng ; Shi, X. ; Shi, X. D. ; Song, J. J. ; Song, W. M. ; Song, Yunxuan ; Sosio, Stefano ; Spataro, Stefano ; Su, K. X. ; Su, P. P. ; Sui, F. F. ; Sun, Gongxing ; Sun, H. K. ; Sun, J. F. ; Sun, L. ; Sun, S. S. ; Sun, T. ; Sun, W. Y. ; Sun, W. Y. ; Sun, X. ; Sun, Y. J. ; Sun, Y. K. ; Sun, Y. Z. ; Sun, Z. T. ; Tan, Y. H. ; Tan, Y. X. ; Tang, C. J. ; Tang, G. Y. ; Tang, J. ; Teng, J. X. ; Thoren, Viktor ; Tian, Y. T. ; Uman, Ismail ; Wang, B. ; Wang, C. W. ; Wang, D. Y. ; Wang, H. J. ; Wang, H. P. ; Wang, K. ; Wang, L. L. ; Wang, M. ; Wang, M. Z. ; Wang, Meng ; Wang, W. ; Wang, W. H. ; Wang, W. P. ; Wang, X. ; Wang, Xiongfei ; Wang, X. L. ; Wang, Y. ; Wang, Y. ; Wang, Y. D. ; Wang, Y. F. ; Wang, Y. Q. ; Wang, Y. Y. ; Wang, Z. ; Wang, Zongyuan ; Wang, Ziyi ; Wang, Zongyuan ; Wei, D. H. ; Weidenkaff, P. ; Weidner, Frederik ; Wen, Shuopin ; White, D. J. ; Wiedner, Ulrich ; Wilkinson, G. ; Wolke, Magnus ; Wollenberg, Leonard ; Wu, J. F. ; Wu, Linghui ; Wu, Lianjin ; Wu, Xiao ; Wu, Z. ; Xia, Lei ; Xiao, H. ; Xiao, S. Y. ; Xiao, Zhenjun ; Xie, X. H. ; Xie, Y. G. ; Xie, Y. H. ; Xing, T. Y. ; Xu, Guofa ; Xu, Q. J. ; Xu, W. ; Xu, Xinping ; Xu, Y. C. ; Yan, F. ; Yan, Liang ; Yan, W. B. ; Yan, W. C. ; Yan, Xu ; Yang, H. J. ; Yang, Hongxun ; Yang, L. ; Yang, S. L. ; Yang, Yongxu ; Yang, Yifan ; Yang, Zhi ; Ye, M. ; Ye, Minghan ; Yin, J. H. ; You, Z. Y. ; Yu, Boxiang ; Yu, C. X. ; Yu, G. ; Yu, J. S. ; Yu, T. ; Yuan, Chang-Zheng ; Yuan, L. ; Yuan, X. Q. ; Yuan, Y. ; Yuan, Z. Y. ; Yue, C. X. ; Zafar, A. A. ; Zeng, Y. ; Zhang, B. X. ; Zhang, Guangyi ; Zhang, H. ; Zhang, H. H. ; Zhang, H. H. ; Zhang, Hongyu ; Zhang, J. J. ; Zhang, J. L. ; Zhang, J. Q. ; Zhang, J. W. ; Zhang, Jianyong ; Zhang, J. Z. ; Zhang, Jianyu ; Zhang, Jiawei ; Zhang, L. M. ; Zhang, Liqing ; Zhang, Lei ; Zhang, S. ; Zhang, S. F. ; Zhang, Shulei ; Zhang, X. D. ; Zhang, X. Y. ; Zhang, Y. ; Zhang, Y. H. ; Zhang, Yateng ; Zhang, Yan ; Zhang, Yao ; Zhang, Yi ; Zhang, Z. H. ; Zhang, Z. Y. ; Zhao, G. ; Zhao, J. ; Zhao, J. Y. ; Zhao, J. Z. ; Zhao, Lei ; Zhao, Ling ; Zhao, Ming-Gang ; Zhao, Q. ; Zhao, Shujun ; Zhao, Yubin ; Zhao, Y. X. ; Zhao, Zhengguo ; Zhemchugov, Alexey ; Zheng, Bo ; Zheng, Jianping ; Zheng, Y. ; Zheng, Y. H. ; Zhong, B. ; Zhong, C. ; Zhou, L. P. ; Zhou, Q. ; Zhou, X. ; Zhou, X. K. ; Zhou, X. R. ; Zhou, X. Y. ; Zhu, A. N. ; Zhu, J. ; Zhu, K. ; Zhu, Kejun ; Zhu, S. H. ; Zhu, T. J. ; Zhu, W. J. ; Zhu, W. J. ; Zhu, Y. C. ; Zhu, Zian ; Zou, B. S. ; Zou, Jiaheng
Though immensely successful, the standard model of particle physics does not offer any explanation as to why our Universe contains so much more matter than antimatter. A key to a dynamically generated matter–antimatter asymmetry is the existence of processes that violate the combined charge conjugation and parity (CP) symmetry1. As such, precision tests of CP symmetry may be used to search for physics beyond the standard model. However, hadrons decay through an interplay of strong and weak processes, quantified in terms of relative phases between the amplitudes. Although previous experiments constructed CP observables that depend on both strong and weak phases, we present an approach where sequential two-body decays of entangled multi-strange baryon–antibaryon pairs provide a separation between these phases. Our method, exploiting spin entanglement between the double-strange Ξ− baryon and its antiparticle2 Ξ¯+
, has enabled a direct determination of the weak-phase difference, (ξP − ξS) = (1.2 ± 3.4 ± 0.8) × 10−2 rad. Furthermore, three independent CP observables can be constructed from our measured parameters. The precision in the estimated parameters for a given data sample size is several orders of magnitude greater than achieved with previous methods3. Finally, we provide an independent measurement of the recently debated Λ decay parameter αΛ (refs. 4,5). The ΛΛ¯
asymmetry is in agreement with and compatible in precision to the most precise previous measurement.
In the last two decades, new unpredicted charmonium-like states with extraordinary characteristics have been observed experimentally. These states also known as the XYZ states, e.g., the Y(4260) or the X(3872), are mostly interpreted as QCD allowed exotic hadrons. One of the leading hadron physics experiments in the world, the Beijing Electron Spectrometer III (BESIII) at the Beijing Electron-Positron Collider II (BEPCII) is aiming towards revealing the internal structure of these states. It has brought numerous breakthrough discoveries including the discovery of the charged Zc(3900). In order to understand the nature of the Y(4260) state and its decay patterns, an inclusive analysis is performed for different recoil systems (π+π−,K+K− and K±π∓) using the BESIII data samples for center of mass energies above 4 GeV collected between 2013 and 2019. The aim of this analysis is twofold: on one hand, we search for new unobserved charmonium-like decay channels using the missing mass technique and on the other hand, it provides an accurate inclusive cross section measurement for e+e−→X π+π−, with the X being the J/ψ, hc and ψ(2S), respectively. Two resonant structures, the Y(4220) and the Y(4390), are observed in the inclusive energy dependent Born cross section of e+e−→hc π+π−, which is consistent with the BESIII exclusive measurements. Moreover, the energy dependent cross section of e+e−→J/ψ π+π− is investigated, in which two resonances have consistently been observed with the previous BESIII exclusive studies, namely, the Y(4220) and the Y(4320). In the (K±π±) recoil system, possible Y(4260) open charm decay channels are investigated. Two enhancements are observed in the inclusive energy dependent cross section of e+e−→DD above 4.13GeV, which could possibly be the ψ(4160)and the ψ(4415).
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