Precision Measurement of the e^{+}e^{-}→Λ_{c}^{+}Λ[over ¯]_{c}^{-} Cross Section Near Threshold.

M Ablikim,M N Achasov,S Ahmed,M Albrecht,M Alekseev,A Amoroso, F F An, Q An,J Z Bai,Y Bai, O Bakina,R Baldini Ferroli, Y Ban,K Begzsuren,D W Bennett,J V Bennett, N Berger,M Bertani,D Bettoni,F Bianchi, E Boger, I Boyko,R A Briere, H Cai,X Cai,O Cakir,A Calcaterra,G F Cao,S A Cetin,J Chai,J F Chang, G Chelkov,G Chen, H S Chen, J C Chen,M L Chen,P L Chen, S J Chen,X R Chen, Y B Chen, X K Chu,G Cibinetto,F Cossio,H L Dai,J P Dai, A Dbeyssi, D Dedovich, Z Y Deng,A Denig, I Denysenko,M Destefanis,F De Mori, Y Ding, C Dong,J Dong,L Y Dong,M Y Dong,Z L Dou,S X Du, P F Duan, J Fang,S S Fang,Y Fang, R Farinelli, L Fava,S Fegan, F Feldbauer,G Felici, C Q Feng,E Fioravanti,M Fritsch, C D Fu,Q Gao,X L Gao,Y Gao,Y G Gao,Z Gao, B Garillon, I Garzia,A Gilman,K Goetzen,L Gong, W X Gong,W Gradl, M Greco,M H Gu,Y T Gu,A Q Guo,R P Guo,Y P Guo,A Guskov,Z Haddadi,S Han, X Q Hao,F A Harris,K L He, X Q He,F H Heinsius,T Held,Y K Heng,T Holtmann,Z L Hou,H M Hu, J F Hu, T Hu, Y Hu,G S Huang,J S Huang,X T Huang,X Z Huang,Z L Huang,T Hussain,W Ikegami Andersson,Q Ji,Q P Ji,X B Ji,X L Ji,X S Jiang,X Y Jiang, J B Jiao,Z Jiao, D P Jin,S Jin,Y Jin,T Johansson, A Julin,N Kalantar-Nayestanaki,X S Kang,M Kavatsyuk, B C Ke,T Khan,A Khoukaz, P Kiese, R Kliemt,L Koch, O B Kolcu, B Kopf, M Kornicer,M Kuemmel,M Kuhlmann,A Kupsc,W Kühn,J S Lange,M Lara,P Larin, L Lavezzi,H Leithoff, C Li, Cheng Li,D M Li,F Li,F Y Li,G Li,H B Li, H J Li, J C Li, J W Li, Jin Li, K J Li, Kang Li, Ke Li, Lei Li, P L Li,P R Li,Q Y Li,W D Li,W G Li, X L Li,X N Li,X Q Li,Z B Li,H Liang,Y F Liang,Y T Liang, G R Liao,J Libby,C X Lin,D X Lin, B Liu, B J Liu,C X Liu,D Liu, F H Liu, Fang Liu, Feng Liu,H B Liu, H L Liu, H M Liu, Huanhuan Liu, Huihui Liu, J B Liu, J Y Liu, K Liu, K Y Liu, Ke Liu,L D Liu,Q Liu, S B Liu,X Liu, Y B Liu,Z A Liu,Zhiqing Liu,Y F Long,X C Lou, H J Lu, J G Lu,Y Lu,Y P Lu,C L Luo,M X Luo,X L Luo,S Lusso, X R Lyu,F C Ma,H L Ma,L L Ma,M M Ma,Q M Ma,T Ma,X N Ma,X Y Ma,Y M Ma,F E Maas, M Maggiora, Q A Malik, Y J Mao, Z P Mao,S Marcello,Z X Meng, J G Messchendorp, G Mezzadri,J Min, R E Mitchell, X H Mo,Y J Mo,C Morales Morales,N Yu Muchnoi,H Muramatsu,A Mustafa,Y Nefedov, F Nerling, I B Nikolaev, Z Ning,S Nisar,S L Niu,X Y Niu,S L Olsen, Q Ouyang,S Pacetti,Y Pan, M Papenbrock,P Patteri,M Pelizaeus,J Pellegrino, H P Peng, Z Y Peng,K Peters,J Pettersson,J L Ping, R G Ping, A Pitka,R Poling,V Prasad, H R Qi,M Qi,T Y Qi,S Qian,C F Qiao,N Qin,X S Qin,Z H Qin, J F Qiu, K H Rashid,C F Redmer,M Richter, M Ripka,M Rolo, G Rong,Ch Rosner, A Sarantsev,M Savrié, C Schnier,K Schoenning, W Shan,X Y Shan,M Shao,C P Shen,P X Shen,X Y Shen,H Y Sheng,X Shi,J J Song,W M Song,X Y Song, S Sosio,C Sowa, S Spataro,G X Sun,J F Sun,L Sun,S S Sun,X H Sun,Y J Sun,Y K Sun,Y Z Sun,Z J Sun,Z T Sun, Y T Tan,C J Tang,G Y Tang,X Tang,I Tapan, M Tiemens, B Tsednee, I Uman, G S Varner,B Wang,B L Wang, D Wang, D Y Wang, Dan Wang,K Wang,L L Wang,L S Wang,M Wang,Meng Wang,P Wang,P L Wang,W P Wang, X F Wang,Y Wang, Y D Wang, Y F Wang, Y Q Wang, Z Wang, Z G Wang, Z Y Wang, Zongyuan Wang,T Weber,D H Wei,J H Wei, P Weidenkaff,S P Wen,U Wiedner, M Wolke,L H Wu,L J Wu,Z Wu,L Xia,Y Xia, D Xiao,Y J Xiao,Z J Xiao,Y G Xie,Y H Xie, X A Xiong,Q L Xiu,G F Xu,J J Xu,L Xu,Q J Xu,Q N Xu, X P Xu,F Yan,L Yan,W B Yan,W C Yan,Y H Yan,H J Yang,H X Yang,L Yang,Y H Yang,Y X Yang,Yifan Yang,M Ye,M H Ye, J H Yin, Z Y You,B X Yu,C X Yu,J S Yu,C Z Yuan,Y Yuan, A Yuncu,A A Zafar,Y Zeng,Z Zeng, B X Zhang, B Y Zhang,C C Zhang, D H Zhang, H H Zhang, H Y Zhang, J Zhang, J L Zhang,J Q Zhang, J W Zhang, J Y Zhang, J Z Zhang,K Zhang,L Zhang,S Q Zhang, X Y Zhang, Y Zhang, Y H Zhang, Y T Zhang, Yang Zhang, Yao Zhang, Yu Zhang, Z H Zhang, Z P Zhang, Z Y Zhang,G Zhao,J W Zhao,J Y Zhao,J Z Zhao,Lei Zhao,Ling Zhao,M G Zhao, Q Zhao,S J Zhao,T C Zhao,Y B Zhao,Z G Zhao,A Zhemchugov,B Zheng,J P Zheng, Y H Zheng,B Zhong, L Zhou,Q Zhou,X Zhou,X K Zhou,X R Zhou,X Y Zhou,A N Zhu,J Zhu,K Zhu,K J Zhu,S Zhu,S H Zhu,X L Zhu,Y C Zhu,Y S Zhu,Z A Zhu, J Zhuang, B S Zou, J H Zou

PHYSICAL REVIEW LETTERS（2018）

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摘要

The cross section of the e(+)e(-) -> Lambda(+)(c)(Lambda) over bar (-)(c) process is measured with unprecedented precision using data collected with the BESIII detector at root s = 4574.5, 4580.0, 4590.0 and 4599.5 MeV. The nonzero cross section near the Lambda(+)(c)(Lambda) over bar (-)(c) production threshold is cleared. At center-of-mass energies root s = 4574.5 and 4599.5 MeV, the higher statistics data enable us to measure the Lambda(c) polar angle distributions. From these, the.c electric over magnetic form-factor ratios (vertical bar G(E)/G(M)vertical bar) are measured for the first time. They are found to be 1.14 +/- 0.14 +/- 0.07 and 1.23 +/- 0.05 +/- 0.03, respectively, where the first uncertainties are statistical and the second are systematic.

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