Complete Measurement of the Λ Electromagnetic Form Factors.

M Ablikim,M N Achasov, P Adlarson,S Ahmed,M Albrecht,M Alekseev,A Amoroso, F F An, Q An, Y Bai, O Bakina,R Baldini Ferroli, Y Ban,K Begzsuren,J V Bennett, N Berger,M Bertani,D Bettoni,F Bianchi,J Biernat, J Bloms, I Boyko, R A Briere,H Cai,X Cai,A Calcaterra,G F Cao,N Cao,S A Cetin, J Chai, J F Chang,W L Chang, G Chelkov,D Y Chen,G Chen, H S Chen, J C Chen, M L Chen, S J Chen, Y B Chen,W Cheng,G Cibinetto,F Cossio,X F Cui, H L Dai, J P Dai,X C 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,J Z Fan, J Fang, S S Fang,Y Fang,R Farinelli, L Fava, F Feldbauer,G Felici, C Q Feng,M Fritsch, C D Fu,Y Fu,Q Gao,X L Gao,Y Gao,Y G Gao, Z Gao, B Garillon, I Garzia,E M Gersabeck,A Gilman,K Goetzen,L Gong, W X Gong, W Gradl, M Greco,L M Gu, M H Gu,S Gu, Y T Gu,A Q Guo, L B Guo, R P Guo, Y P Guo,A Guskov,S Han, X Q Hao,F A Harris,K L He, F H Heinsius,T Held,Y K Heng,Y R Hou, 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,N Huesken,T Hussain,W Ikegami Andersson,W Imoehl,M Irshad,Q Ji,Q P Ji,X B Ji,X L Ji,H L Jiang,X S Jiang, X Y Jiang, J B Jiao,Z Jiao, D P Jin,S Jin,Y Jin,T Johansson,N Kalantar-Nayestanaki,X S Kang,R Kappert,M Kavatsyuk, B C Ke,I K Keshk,T Khan,A Khoukaz, P Kiese,R Kiuchi, R Kliemt,L Koch,O B Kolcu, B Kopf,M Kuemmel,M Kuessner,A Kupsc, M Kurth, M G Kurth,W Kühn, J S Lange, P Larin,L Lavezzi, H Leithoff,T Lenz,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,Ke Li,L K Li,Lei Li,P L Li, P R Li,Q Y Li,W D Li,W G Li,X H Li,X L Li,X N Li,X Q Li,Z B Li,Z Y Li,H Liang,Y F Liang,Y T Liang, G R Liao, L Z Liao,J Libby,C X Lin,D X Lin, Y J Lin, B Liu, B J Liu,C X Liu, D Liu,D Y Liu,F H Liu, Fang Liu, Feng Liu,H B Liu,H M Liu,Huanhuan Liu,Huihui Liu, J B Liu,J Y Liu,K Y Liu,Ke Liu,Q Liu, S B Liu,T Liu,X Liu,X Y Liu, Y B Liu,Z A Liu,Zhiqing Liu, Y F Long, X C Lou, H J Lu, J D Lu, J G Lu,Y Lu,Y P Lu, C L Luo, M X Luo, P W Luo,T Luo, X L Luo, S Lusso, X R Lyu, F C Ma,H L Ma,L L Ma,M M Ma,Q M Ma,X N Ma,X X Ma,X Y Ma,Y M Ma,F E Maas,M Maggiora,S Maldaner,S Malde, Q A Malik,A Mangoni, Y J Mao,Z P Mao,S Marcello,Z X Meng,J G Messchendorp, G Mezzadri,J Min,T J Min, R E Mitchell, X H Mo,Y J Mo,C Morales Morales,N Yu Muchnoi,H Muramatsu,A Mustafa, S Nakhoul,Y Nefedov, F Nerling, I B Nikolaev, Z Ning,S Nisar, S L Niu,S L Olsen, Q Ouyang,S Pacetti,Y Pan, M Papenbrock,P Patteri,M Pelizaeus, H P Peng,K Peters,J Pettersson, J L Ping, R G Ping, A Pitka,R Poling,V Prasad,M Qi,T Y Qi, S Qian, C F Qiao,N Qin,X P Qin,X S Qin, Z H Qin, J F Qiu,S Q Qu, K H Rashid, C F Redmer,M Richter, M Ripka,A Rivetti,V Rodin,M Rolo, G Rong,Ch Rosner,M Rump, A Sarantsev,M Savrié,K Schoenning, W Shan,X Y Shan,M Shao, C P Shen, P X Shen, X Y Shen,H Y Sheng, X Shi, X D Shi,J J Song, Q Q Song, X Y Song, S Sosio,C Sowa, S Spataro, F F Sui,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,V Thoren,B Tsednee,I Uman,B Wang,B L Wang,C W Wang, D Y Wang, H H Wang,K Wang,L L Wang,L S Wang,M Wang,M Z Wang,Meng Wang,P L Wang,R M Wang,W P Wang,X Wang, X F Wang, X L Wang,Y Wang,Y F Wang,Z Wang, Z G Wang,Z Y Wang,Zongyuan Wang,T Weber, D H Wei, P Weidenkaff, H W Wen, S P Wen,U Wiedner,G Wilkinson,M Wolke,L H Wu,L J Wu,Z Wu,L Xia,Y Xia,S Y Xiao,Y J Xiao,Z J Xiao, Y G Xie, Y H Xie,T Y Xing, X A Xiong, Q L Xiu, G F Xu,J J Xu,L Xu, Q J Xu,W 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,R X Yang,S L Yang,Y H Yang,Y X Yang,Yifan Yang,Z Q Yang,M Ye,M H Ye, J H Yin,Z Y You, B X Yu, C X Yu, J S Yu,C Z Yuan,X Q Yuan,Y Yuan, A Yuncu,A A Zafar,Y 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 F Zhang, T J Zhang,X Y Zhang,Y Zhang,Y H Zhang,Y T Zhang,Yang Zhang,Yao Zhang,Yi 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 Zheng, Y H Zheng,B Zhong, L Zhou, L P Zhou,Q Zhou,X Zhou,X K Zhou,X R Zhou,Xiaoyu Zhou,Xu Zhou,A N Zhu,J Zhu,K Zhu,K J Zhu, S H Zhu,W J Zhu, X L Zhu, Y C Zhu, Y S Zhu,Z A Zhu, J Zhuang,B S Zou, J H Zou

PHYSICAL REVIEW LETTERS（2019）

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摘要

The exclusive process e(+)e(-) -> Lambda(Lambda) over bar, with Lambda -> p pi(-) and (Lambda) over bar -> (p) over bar pi(+), has been studied at root s = 2.396 GeV for measurement of the timelike Lambda electric and magnetic form factors, G(E) and G(M). A data sample, corresponding to an integrated luminosity of 66.9 pb(-1), was collected with the BESIII detector for this purpose. A multidimensional analysis with a complete decomposition of the spin structure of the reaction enables a determination of the modulus of the ratio R = vertical bar G(E)/G(M)vertical bar and, for the first time for any baryon, the relative phase Delta Phi = Phi(E) - Phi(M). The resulting values are R = 0.96 +/- 0.14(stat) +/- 0.02(syst) and Phi(F) = 37 degrees +/- 12 degrees (stat) +/- 6 degrees (syst), respectively. These are obtained using the recently established and most precise value of the asymmetry parameter alpha(Lambda) = 0.750 +/- 0.010 measured by BESIII. In addition, the cross section is measured with unprecedented precision to be sigma = 118.7 +/- 5.3(stat) +/- 5.1(syst) pb, which corresponds to an effective form factor of vertical bar G vertical bar = 0.123 +/- 0.003(stat) +/- 0.003(syst). The contribution from two-photon exchange is found to be negligible. Our result enables the first complete determination of baryon timelike electromagnetic form factors.

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