Measurements of Born Cross Sections for e^+e^-→Λ_c^+
Λ̅_c(2595)^- + c.c. and e^+e^-→Λ_c^+
Λ̅_c(2625)^- + c.c. at √(s)=4918.0 and 4950.9 MeV
BESIII Collaboration,M. Ablikim,M. N. Achasov,P. Adlarson,O. Afedulidis,X. C. Ai,R. Aliberti,A. Amoroso,Q. An,Y. Bai,O. Bakina,I. Balossino,Y. Ban,H. -R. Bao,V. Batozskaya,K. Begzsuren,N. Berger,M. Berlowski,M. Bertani,D. Bettoni,F. Bianchi,E. Bianco,A. Bortone,I. Boyko,R. A. Briere,A. Brueggemann,H. Cai,X. Cai,A. Calcaterra,G. F. Cao,N. Cao,S. A. Cetin,J. F. Chang,W. L. Chang,G. R. Che,G. Chelkov,C. Chen,C. H. Chen,Chao Chen,G. Chen,H. S. Chen,M. L. Chen,S. J. Chen,S. L. Chen,S. M. Chen,T. Chen,X. R. Chen,X. T. Chen,Y. B. Chen,Y. Q. Chen,Z. J. Chen,Z. Y. Chen,S. K. Choi,X. Chu,G. Cibinetto,F. Cossio,J. J. Cui,H. L. Dai,J. P. Dai,A. Dbeyssi,R. E. de Boer,D. Dedovich,C. Q. Deng,Z. Y. Deng,A. Denig,I. Denysenko,M. Destefanis,F. De Mori,B. Ding,X. X. Ding,Y. Ding,Y. Ding,J. Dong,L. Y. Dong,M. Y. Dong,X. Dong,M. C. Du,S. X. Du,Z. H. Duan,P. Egorov,Y. H. Fan,J. Fang,J. Fang,S. S. Fang,W. X. Fang,Y. Fang,Y. Q. Fang,R. Farinelli,L. Fava,F. Feldbauer,G. Felici,C. Q. Feng,J. H. Feng,Y. T. Feng,K. Fischer,M. Fritsch,C. D. Fu,J. L. Fu,Y. W. Fu,H. Gao,Y. N. Gao,Yang Gao,S. Garbolino,I. Garzia,P. T. Ge,Z. W. Ge,C. Geng,E. M. Gersabeck,A. Gilman,K. Goetzen,L. Gong,W. X. Gong,W. Gradl,S. Gramigna,M. Greco,M. H. Gu,Y. T. Gu,C. Y. Guan,Z. L. Guan,A. Q. Guo,L. B. Guo,M. J. Guo,R. P. Guo,Y. P. Guo,A. Guskov,J. Gutierrez,K. L. Han,T. T. Han,X. Q. Hao,F. A. Harris,K. K. He,K. L. He,F. H. Heinsius,C. H. Heinz,Y. K. Heng,C. Herold,T. Holtmann,P. C. Hong,G. Y. Hou,X. T. Hou,Y. R. Hou,Z. L. Hou,B. Y. Hu,H. M. Hu,J. F. Hu,T. Hu,Y. Hu,G. S. Huang,K. X. Huang,L. Q. Huang,X. T. Huang,Y. P. Huang,T. Hussain,F. Hölzken,N Hüsken,N. in der Wiesche,M. Irshad,J. Jackson,S. Janchiv,J. H. Jeong,Q. Ji,Q. P. Ji,W. Ji,X. B. Ji,X. L. Ji,Y. Y. Ji,X. Q. Jia,Z. K. Jia,D. Jiang,H. B. Jiang,P. C. Jiang,S. S. Jiang,T. J. Jiang,X. S. Jiang,Y. Jiang,J. B. Jiao,J. K. Jiao,Z. Jiao,S. Jin,Y. Jin,M. Q. Jing,X. M. Jing,T. Johansson,S. Kabana,N. Kalantar-Nayestanaki,X. L. Kang,X. S. Kang,M. Kavatsyuk,B. C. Ke,V. Khachatryan,A. Khoukaz,R. Kiuchi,O. B. Kolcu,B. Kopf,M. Kuessner,X. Kui,A. Kupsc,W. Kühn,J. J. Lane,P. Larin,L. Lavezzi,T. T. Lei,Z. H. Lei,H. Leithoff,M. Lellmann,T. Lenz,C. Li,C. Li,C. H. Li,Cheng Li,D. M. Li,F. Li,G. Li,H. Li,H. B. Li,H. J. Li,H. N. Li,Hui Li,J. R. Li,J. S. Li,Ke Li,L. J Li,L. K. Li,Lei Li,M. H. Li,P. R. Li,Q. M. Li,Q. X. Li,R. Li,S. X. Li,T. Li,W. D. Li,W. G. Li,X. Li,X. H. Li,X. L. Li,Xiaoyu Li,Y. G. Li,Z. J. Li,Z. X. Li,C. Liang,H. Liang,H. Liang,Y. F. Liang,Y. T. Liang,G. R. Liao,L. Z. Liao,Y. P. Liao,J. Libby,A. Limphirat,D. X. Lin,T. Lin,B. J. Liu,B. X. Liu,C. Liu,C. X. Liu,F. H. Liu,Fang Liu,Feng Liu,G. M. Liu,H. Liu,H. B. Liu,H. M. Liu,Huanhuan Liu,Huihui Liu,J. B. Liu,J. Y. Liu,K. Liu,K. Y. Liu,Ke Liu,L. Liu,L. C. Liu,Lu Liu,M. H. Liu,P. L. Liu,Q. Liu,S. B. Liu,T. Liu,W. K. Liu,W. M. Liu,X. Liu,X. Liu,Y. Liu,Y. Liu,Y. B. Liu,Z. A. Liu,Z. D. Liu,Z. Q. Liu,X. C. Lou,F. X. Lu,H. J. Lu,J. G. Lu,X. L. Lu,Y. Lu,Y. P. Lu,Z. H. Lu,C. L. Luo,M. X. Luo,T. Luo,X. L. Luo,X. R. Lyu,Y. F. Lyu,F. C. Ma,H. Ma,H. L. Ma,J. L. Ma,L. L. Ma,M. M. Ma,Q. M. Ma,R. Q. Ma,X. T. Ma,X. Y. Ma,Y. Ma,Y. M. Ma,F. E. Maas,M. Maggiora,S. Malde,A. Mangoni,Y. J. Mao,Z. P. Mao,S. Marcello,Z. X. Meng,J. G. Messchendorp,G. Mezzadri,H. Miao,T. J. Min,R. E. Mitchell,X. H. Mo,B. Moses,N. Yu. Muchnoi,J. Muskalla,Y. Nefedov,F. Nerling,I. B. Nikolaev,Z. Ning,S. Nisar,Q. L. Niu,W. D. Niu,Y. Niu,S. L. Olsen,Q. Ouyang,S. Pacetti,X. Pan,Y. Pan,A. Pathak,P. Patteri,Y. P. Pei,M. Pelizaeus,H. P. Peng,Y. Y. Peng,K. Peters,J. L. Ping,R. G. Ping,S. Plura,V. Prasad,F. Z. Qi,H. Qi,H. R. Qi,M. Qi,T. Y. Qi,S. Qian,W. B. Qian,C. F. Qiao,J. J. Qin,L. Q. Qin,X. S. Qin,Z. H. Qin,J. F. Qiu,S. Q. Qu,Z. H. Qu,C. F. Redmer,K. J. Ren,A. Rivetti,M. Rolo,G. Rong,Ch. Rosner,S. N. Ruan,N. Salone,A. Sarantsev,Y. Schelhaas,K. Schoenning,M. Scodeggio,K. Y. Shan,W. Shan,X. Y. Shan,J. F. Shangguan,L. G. Shao,M. Shao,C. P. Shen,H. F. Shen,W. H. Shen,X. Y. Shen,B. A. Shi,H. C. Shi,J. L. Shi,J. Y. Shi,Q. Q. Shi,R. S. Shi,S. Y. Shi,X. Shi,J. J. Song,T. Z. Song,W. M. Song,Y. J. Song,Y. X. Song,S. Sosio,S. Spataro,F. Stieler,Y. J. Su,G. B. Sun,G. X. Sun,H. Sun,H. K. Sun,J. F. Sun,K. Sun,L. Sun,S. S. Sun,T. Sun,W. Y. Sun,Y. Sun,Y. J. Sun,Y. Z. Sun,Z. Q. Sun,Z. T. Sun,C. J. Tang,G. Y. Tang,J. Tang,Y. A. Tang,L. Y. Tao,Q. T. Tao,M. Tat,J. X. Teng,V. Thoren,W. H. Tian,Y. Tian,Z. F. Tian,I. Uman,Y. Wan,S. J. Wang,B. Wang,B. L. Wang,Bo Wang,D. Y. Wang,F. Wang,H. J. Wang,J. P. Wang,K. Wang,L. L. Wang,M. Wang,Meng Wang,N. Y. Wang,S. Wang,S. Wang,T. Wang,T. J. Wang,W. Wang,W. Wang,W. P. Wang,X. Wang,X. F. Wang,X. J. Wang,X. L. Wang,X. N. Wang,Y. Wang,Y. D. Wang,Y. F. Wang,Y. L. Wang,Y. N. Wang,Y. Q. Wang,Yaqian Wang,Yi Wang,Z. Wang,Z. L. Wang,Z. Y. Wang,Ziyi Wang,D. Wei,D. H. Wei,F. Weidner,S. P. Wen,Y. R. Wen,U. Wiedner,G. Wilkinson,M. Wolke,L. Wollenberg,C. Wu,J. F. Wu,L. H. Wu,L. J. Wu,X. Wu,X. H. Wu,Y. Wu,Y. H. Wu,Y. J. Wu,Z. Wu,L. Xia,X. M. Xian,B. H. Xiang,T. Xiang,D. Xiao,G. Y. Xiao,X. Xiao,S. Y. Xiao,Y. L. Xiao,Z. J. Xiao,C. Xie,X. H. Xie,Y. Xie,Y. G. Xie,Y. H. Xie,Z. P. Xie,T. Y. Xing,C. F. Xu,C. J. Xu,G. F. Xu,H. Y. Xu,Q. J. Xu,Q. N. Xu,W. Xu,W. L. Xu,X. P. Xu,Y. C. Xu,Z. P. Xu,Z. S. Xu,F. Yan,L. Yan,W. B. Yan,W. C. Yan,X. Q. Yan,H. J. Yang,H. L. Yang,H. X. Yang,Tao Yang,Y. Yang,Y. F. Yang,Y. X. Yang,Yifan Yang,Z. W. Yang,Z. P. Yao,M. Ye,M. H. Ye,J. H. Yin,Z. Y. You,B. X. Yu,C. X. Yu,G. Yu,J. S. Yu,T. Yu,X. D. Yu,C. Z. Yuan,J. Yuan,L. Yuan,S. C. Yuan,Y. Yuan,Z. Y. Yuan,C. X. Yue,A. A. Zafar,F. R. Zeng,S. H. Zeng,X. Zeng,Y. Zeng,Y. J. Zeng,Y. J. Zeng,X. Y. Zhai,Y. C. Zhai,Y. H. Zhan,A. Q. Zhang,B. L. Zhang,B. X. Zhang,D. H. Zhang,G. Y. Zhang,H. Zhang,H. C. Zhang,H. H. Zhang,H. H. Zhang,H. Q. Zhang,H. Y. Zhang,J. Zhang,J. Zhang,J. J. Zhang,J. L. Zhang,J. Q. Zhang,J. W. Zhang,J. X. Zhang,J. Y. Zhang,J. Z. Zhang,Jianyu Zhang,L. M. Zhang,Lei Zhang,P. Zhang,Q. Y. Zhang,Shuihan Zhang,Shulei Zhang,X. D. Zhang,X. M. Zhang,X. Y. Zhang,Y. Zhang,Y. T. Zhang,Y. H. Zhang,Y. M. Zhang,Yan Zhang,Yao Zhang,Z. D. Zhang,Z. H. Zhang,Z. L. Zhang,Z. Y. Zhang,Z. Y. Zhang,G. Zhao,J. Y. Zhao,J. Z. Zhao,Lei Zhao,Ling Zhao,M. G. Zhao,R. P. Zhao,S. J. Zhao,Y. B. Zhao,Y. X. Zhao,Z. G. Zhao,A. Zhemchugov,B. Zheng,J. P. Zheng,W. J. Zheng,Y. H. Zheng,B. Zhong,X. Zhong,H. Zhou,J. Y. Zhou,L. P. Zhou,X. Zhou,X. K. Zhou,X. R. Zhou,X. Y. Zhou,Y. Z. Zhou,J. Zhu,K. Zhu,K. J. Zhu,L. Zhu,L. X. Zhu,S. H. Zhu,S. Q. Zhu,T. J. Zhu,W. J. Zhu,Y. C. Zhu,Z. A. Zhu,J. H. Zou,J. Zu
arxiv（2023）
引用0|浏览7
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摘要
Using e^+e^- collision data collected with the BESIII detector operating at
the BEPCII collider, the Born cross sections of e^+e^-→Λ_c^+
Λ̅_c(2595)^- + c.c. and e^+e^-→Λ_c^+
Λ̅_c(2625)^- + c.c. are measured for the first time at
center-of-mass energies of √(s)=4918.0 and 4950.9 MeV. Non-zero cross
sections are observed very close to the production threshold. The measured Born
cross sections of e^+e^-→Λ_c^+ Λ̅_c(2625)^- +
c.c. are about 2∼3 times greater than those of e^+e^-→Λ_c^+ Λ̅_c(2595)^- + c.c., thereby indicating that
the exotic structure potentially exists in the excited charmed baryons. The
Born cross sections are 15.6±3.1±0.9 pb and 29.4±3.7±2.7 pb for
e^+e^-→Λ_c^+ Λ̅_c(2595)^- + c.c., and are
43.4±4.0±4.1 pb and 76.8±6.5±4.2 pb for e^+e^-→Λ_c^+
Λ̅_c(2625)^- +c.c. at √(s)=4918.0 and 4950.9 MeV,
respectively. Based on the polar angle distributions of the
Λ̅_c(2625)^- and Λ_c(2625)^+, the form-factor ratios
√(|G_E|^2 + 3|G_M|^2)/|G_C| are determined for e^+e^-→Λ_c^+ Λ̅_c(2625)^- + c.c. for the first time, which
are 5.95±4.07±0.15 and 0.94±0.32±0.02 at √(s)=4918.0 and
4950.9 MeV, respectively. All of these first uncertainties are statistical and
second systematic.
