Abstract
The cross section of the e+e-→Λc+Λc- process is measured with unprecedented precision using data collected with the BESIII detector at s=4574.5, 4580.0, 4590.0 and 4599.5 MeV. The nonzero cross section near the Λc+Λc- production threshold is cleared. At center-of-mass energies s=4574.5 and 4599.5 MeV, the higher statistics data enable us to measure the Λc polar angle distributions. From these, the Λc electric over magnetic form-factor ratios (|GE/GM|) 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.
| Original language | English (US) |
|---|---|
| Article number | 132001 |
| Journal | Physical review letters |
| Volume | 120 |
| Issue number | 13 |
| DOIs | |
| State | Published - Mar 29 2018 |
Bibliographical note
Funding Information:The BESIII Collaboration thanks the staff of BEPCII, the IHEP computing center and the supercomputing center of USTC for their strong support. This work is supported in part by the National Key Basic Research Program of China under Contract No. 2015CB856700; the National Natural Science Foundation of China (NSFC) under Contracts No. 11235011, No. 11335008, No. 11375205, No. 11425524, No. 11625523, No. 11635010, No. 11322544, No. 11375170, No. 11275189, No. 11475164, No. 11475169, No. 11605196, and No. 11605198; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; the CAS Center for Excellence in Particle Physics (CCEPP); Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No. U1332201, No. U1532257, No. U1532258, and No. U1532102; CAS under Contracts No. KJCX2-YW-N29, No. KJCX2-YW-N45, and No. QYZDJ-SSW-SLH003; the 100 Talents Program of CAS; the National 1000 Talents Program of China; INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology; German Research Foundation DFG under Collaborative Research Center Contracts No. CRC 1044 and No. FOR 2359; Istituto Nazionale di Fisica Nucleare, Italy; Koninklijke Nederlandse Akademie van Wetenschappen (KNAW) under Contract No. 530-4CDP03; the Ministry of Development of Turkey under Contract No. DPT2006K-120470; the National Natural Science Foundation of China (NSFC) under Contracts No. 11505034 and No. 11575077; the National Science and Technology fund; the Swedish Research Council; the U.S. Department of Energy under Contracts No. DE-FG02-05ER41374, No. DE-SC-0010118, No. DE-SC-0010504, and No. DE-SC-0012069; the University of Groningen (RuG) and the Helmholtzzentrum fuer Schwerionenforschung GmbH (GSI), Darmstadt; and the WCU Program of the National Research Foundation of Korea under Contract No. R32-2008-000-10155-0.
Funding Information:
This work is supported in part by the National Key Basic Research Program of China under Contract No.2015CB856700; the National Natural Science Foundation of China (NSFC) under Contracts No.11235011, No.11335008, No.11375205, No.11425524, No.11625523, No.11635010, No.11322544, No.11375170, No.11275189, No.11475164, No.11475169, No.11605196, and No.11605198; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; the CAS Center for Excellence in Particle Physics (CCEPP); Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No.U1332201, No.U1532257, No.U1532258, and No.U1532102; CAS under Contracts No.KJCX2-YW-N29, No.KJCX2-YW-N45, and No.QYZDJ-SSW-SLH003; the 100 Talents Program of CAS; the National 1000 Talents Program of China; INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology; German Research Foundation DFG under Collaborative Research Center Contracts No.CRC 1044 and No.FOR 2359; Istituto Nazionale di Fisica Nucleare, Italy; Koninklijke Nederlandse Akademie van Wetenschappen (KNAW) under Contract No.530-4CDP03; the Ministry of Development of Turkey under Contract No.DPT2006K-120470; the National Natural Science Foundation of China (NSFC) under Contracts No.11505034 and No.11575077; the National Science and Technology fund; the Swedish Research Council; the U.S. Department of Energy under Contracts No.DE-FG02-05ER41374, No.DE-SC-0010118, No.DE-SC-0010504, and No.DE-SC-0012069; the University of Groningen (RuG) and the Helmholtzzentrum fuer Schwerionenforschung GmbH (GSI), Darmstadt; and the WCU Program of the National Research Foundation of Korea under Contract No.R32-2008-000-10155-0.
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© 2018 authors. Published by the American Physical Society.
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Precision Measurement of the e+e- → Λc+ Λ c- Cross Section Near Threshold. / Ablikim, M.; Achasov, M. N.; Ahmed, S.; Albrecht, M.; Alekseev, M.; Amoroso, A.; An, F. F.; An, Q.; Bai, J. Z.; Bai, Y.; Bakina, O.; Baldini Ferroli, R.; Ban, Y.; Begzsuren, K.; Bennett, D. W.; Bennett, J. V.; Berger, N.; Bertani, M.; Bettoni, D.; Bianchi, F.; Boger, E.; Boyko, I.; Briere, R. A.; Cai, H.; Cai, X.; Cakir, O.; Calcaterra, A.; Cao, G. F.; Cetin, S. A.; Chai, J.; Chang, J. F.; Chelkov, G.; Chen, G.; Chen, H. S.; Chen, J. C.; Chen, M. L.; Chen, P. L.; Chen, S. J.; Chen, X. R.; Chen, Y. B.; Chu, X. K.; Cibinetto, G.; Cossio, F.; Dai, H. L.; Dai, J. P.; Dbeyssi, A.; Dedovich, D.; Deng, Z. Y.; Denig, A.; Denysenko, I.; Destefanis, M.; De Mori, F.; Ding, Y.; Dong, C.; Dong, J.; Dong, L. Y.; Dong, M. Y.; Dou, Z. L.; Du, S. X.; Duan, P. F.; Fang, J.; Fang, S. S.; Fang, Y.; Farinelli, R.; Fava, L.; Fegan, S.; Feldbauer, F.; Felici, G.; Feng, C. Q.; Fioravanti, E.; Fritsch, M.; Fu, C. D.; Gao, Q.; Gao, X. L.; Gao, Y.; Gao, Y. G.; Gao, Z.; Garillon, B.; Garzia, I.; Gilman, A.; Goetzen, K.; Gong, L.; Gong, W. X.; Gradl, W.; Greco, M.; Gu, M. H.; Gu, Y. T.; Guo, A. Q.; Guo, R. P.; Guo, Y. P.; Guskov, A.; Haddadi, Z.; Han, S.; Hao, X. Q.; Harris, F. A.; He, K. L.; He, X. Q.; Heinsius, F. H.; Held, T.; Heng, Y. K.; Holtmann, T.; Hou, Z. L.; Hu, H. M.; Hu, J. F.; Hu, T.; Hu, Y.; Huang, G. S.; Huang, J. S.; Huang, X. T.; Huang, X. Z.; Huang, Z. L.; Hussain, T.; Ikegami Andersson, W.; Ji, Q.; Ji, Q. P.; Ji, X. B.; Ji, X. L.; Jiang, X. S.; Jiang, X. Y.; Jiao, J. B.; Jiao, Z.; Jin, D. P.; Jin, S.; Jin, Y.; Johansson, T.; Julin, A.; Kalantar-Nayestanaki, N.; Kang, X. S.; Kavatsyuk, M.; Ke, B. C.; Khan, T.; Khoukaz, A.; Kiese, P.; Kliemt, R.; Koch, L.; Kolcu, O. B.; Kopf, B.; Kornicer, M.; Kuemmel, M.; Kuhlmann, M.; Kupsc, A.; Kühn, W.; Lange, J. S.; Lara, M.; Larin, P.; Lavezzi, L.; Leithoff, H.; Li, 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.; Liang, H.; Liang, Y. F.; Liang, Y. T.; Liao, G. R.; Libby, J.; Lin, C. X.; Lin, D. X.; Liu, 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; Long, Y. F.; Lou, X. C.; Lu, H. J.; Lu, J. G.; Lu, Y.; Lu, Y. P.; Luo, C. L.; Luo, M. X.; Luo, X. L.; Lusso, S.; Lyu, X. R.; Ma, 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.; Maas, F. E.; Maggiora, M.; Malik, Q. A.; Mao, Y. J.; Mao, Z. P.; Marcello, S.; Meng, Z. X.; Messchendorp, J. G.; Mezzadri, G.; Min, J.; Mitchell, R. E.; Mo, X. H.; Mo, Y. J.; Morales Morales, C.; Muchnoi, N. Yu; Muramatsu, H.; Mustafa, A.; Nefedov, Y.; Nerling, F.; Nikolaev, I. B.; Ning, Z.; Nisar, S.; Niu, S. L.; Niu, X. Y.; Olsen, S. L.; Ouyang, Q.; Pacetti, S.; Pan, Y.; Papenbrock, M.; Patteri, P.; Pelizaeus, M.; Pellegrino, J.; Peng, H. P.; Peng, Z. Y.; Peters, K.; Pettersson, J.; Ping, J. L.; Ping, R. G.; Pitka, A.; Poling, R.; Prasad, V.; Qi, H. R.; Qi, M.; Qi, T. Y.; Qian, S.; Qiao, C. F.; Qin, N.; Qin, X. S.; Qin, Z. H.; Qiu, J. F.; Rashid, K. H.; Redmer, C. F.; Richter, M.; Ripka, M.; Rolo, M.; Rong, G.; Rosner, Ch; Sarantsev, A.; Savrié, M.; Schnier, C.; Schoenning, K.; Shan, W.; Shan, X. Y.; Shao, M.; Shen, C. P.; Shen, P. X.; Shen, X. Y.; Sheng, H. Y.; Shi, X.; Song, J. J.; Song, W. M.; Song, X. Y.; Sosio, S.; Sowa, C.; Spataro, S.; Sun, 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.; Tan, Y. T.; Tang, C. J.; Tang, G. Y.; Tang, X.; Tapan, I.; Tiemens, M.; Tsednee, B.; Uman, I.; Varner, G. S.; Wang, 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; Weber, T.; Wei, D. H.; Wei, J. H.; Weidenkaff, P.; Wen, S. P.; Wiedner, U.; Wolke, M.; Wu, L. H.; Wu, L. J.; Wu, Z.; Xia, L.; Xia, Y.; Xiao, D.; Xiao, Y. J.; Xiao, Z. J.; Xie, Y. G.; Xie, Y. H.; Xiong, X. A.; Xiu, Q. L.; Xu, G. F.; Xu, J. J.; Xu, L.; Xu, Q. J.; Xu, Q. N.; Xu, X. P.; Yan, F.; Yan, L.; Yan, W. B.; Yan, W. C.; Yan, Y. H.; Yang, H. J.; Yang, H. X.; Yang, L.; Yang, Y. H.; Yang, Y. X.; Yang, Yifan; Ye, M.; Ye, M. H.; Yin, J. H.; You, Z. Y.; Yu, B. X.; Yu, C. X.; Yu, J. S.; Yuan, C. Z.; Yuan, Y.; Yuncu, A.; Zafar, A. A.; Zeng, Y.; Zeng, Z.; Zhang, 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.; Zhao, 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.; Zhemchugov, A.; Zheng, B.; Zheng, J. P.; Zheng, Y. H.; Zhong, B.; Zhou, L.; Zhou, Q.; Zhou, X.; Zhou, X. K.; Zhou, X. R.; Zhou, X. Y.; Zhu, 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.; Zhuang, J.; Zou, B. S.; Zou, J. H.
In: Physical review letters, Vol. 120, No. 13, 132001, 29.03.2018.Research output: Contribution to journal › Article › peer-review
}
TY - JOUR
T1 - Precision Measurement of the e+e- → Λc+ Λ c- Cross Section Near Threshold
AU - Ablikim, M.
AU - Achasov, M. N.
AU - Ahmed, S.
AU - Albrecht, M.
AU - Alekseev, M.
AU - Amoroso, A.
AU - An, F. F.
AU - An, Q.
AU - Bai, J. Z.
AU - Bai, Y.
AU - Bakina, O.
AU - Baldini Ferroli, R.
AU - Ban, Y.
AU - Begzsuren, K.
AU - Bennett, D. W.
AU - Bennett, J. V.
AU - Berger, N.
AU - Bertani, M.
AU - Bettoni, D.
AU - Bianchi, F.
AU - Boger, E.
AU - Boyko, I.
AU - Briere, R. A.
AU - Cai, H.
AU - Cai, X.
AU - Cakir, O.
AU - Calcaterra, A.
AU - Cao, G. F.
AU - Cetin, S. A.
AU - Chai, J.
AU - Chang, J. F.
AU - Chelkov, G.
AU - Chen, G.
AU - Chen, H. S.
AU - Chen, J. C.
AU - Chen, M. L.
AU - Chen, P. L.
AU - Chen, S. J.
AU - Chen, X. R.
AU - Chen, Y. B.
AU - Chu, X. K.
AU - Cibinetto, G.
AU - Cossio, F.
AU - Dai, H. L.
AU - Dai, J. P.
AU - Dbeyssi, A.
AU - Dedovich, D.
AU - Deng, Z. Y.
AU - Denig, A.
AU - Denysenko, I.
AU - Destefanis, M.
AU - De Mori, F.
AU - Ding, Y.
AU - Dong, C.
AU - Dong, J.
AU - Dong, L. Y.
AU - Dong, M. Y.
AU - Dou, Z. L.
AU - Du, S. X.
AU - Duan, P. F.
AU - Fang, J.
AU - Fang, S. S.
AU - Fang, Y.
AU - Farinelli, R.
AU - Fava, L.
AU - Fegan, S.
AU - Feldbauer, F.
AU - Felici, G.
AU - Feng, C. Q.
AU - Fioravanti, E.
AU - Fritsch, M.
AU - Fu, C. D.
AU - Gao, Q.
AU - Gao, X. L.
AU - Gao, Y.
AU - Gao, Y. G.
AU - Gao, Z.
AU - Garillon, B.
AU - Garzia, I.
AU - Gilman, A.
AU - Goetzen, K.
AU - Gong, L.
AU - Gong, W. X.
AU - Gradl, W.
AU - Greco, M.
AU - Gu, M. H.
AU - Gu, Y. T.
AU - Guo, A. Q.
AU - Guo, R. P.
AU - Guo, Y. P.
AU - Guskov, A.
AU - Haddadi, Z.
AU - Han, S.
AU - Hao, X. Q.
AU - Harris, F. A.
AU - He, K. L.
AU - He, X. Q.
AU - Heinsius, F. H.
AU - Held, T.
AU - Heng, Y. K.
AU - Holtmann, T.
AU - Hou, Z. L.
AU - Hu, H. M.
AU - Hu, J. F.
AU - Hu, T.
AU - Hu, Y.
AU - Huang, G. S.
AU - Huang, J. S.
AU - Huang, X. T.
AU - Huang, X. Z.
AU - Huang, Z. L.
AU - Hussain, T.
AU - Ikegami Andersson, W.
AU - Ji, Q.
AU - Ji, Q. P.
AU - Ji, X. B.
AU - Ji, X. L.
AU - Jiang, X. S.
AU - Jiang, X. Y.
AU - Jiao, J. B.
AU - Jiao, Z.
AU - Jin, D. P.
AU - Jin, S.
AU - Jin, Y.
AU - Johansson, T.
AU - Julin, A.
AU - Kalantar-Nayestanaki, N.
AU - Kang, X. S.
AU - Kavatsyuk, M.
AU - Ke, B. C.
AU - Khan, T.
AU - Khoukaz, A.
AU - Kiese, P.
AU - Kliemt, R.
AU - Koch, L.
AU - Kolcu, O. B.
AU - Kopf, B.
AU - Kornicer, M.
AU - Kuemmel, M.
AU - Kuhlmann, M.
AU - Kupsc, A.
AU - Kühn, W.
AU - Lange, J. S.
AU - Lara, M.
AU - Larin, P.
AU - Lavezzi, L.
AU - Leithoff, H.
AU - Li, C.
AU - Li, Cheng
AU - Li, D. M.
AU - Li, F.
AU - Li, F. Y.
AU - Li, G.
AU - Li, H. B.
AU - Li, H. J.
AU - Li, J. C.
AU - Li, J. W.
AU - Li, Jin
AU - Li, K. J.
AU - Li, Kang
AU - Li, Ke
AU - Li, Lei
AU - Li, P. L.
AU - Li, P. R.
AU - Li, Q. Y.
AU - Li, W. D.
AU - Li, W. G.
AU - Li, X. L.
AU - Li, X. N.
AU - Li, X. Q.
AU - Li, Z. B.
AU - Liang, H.
AU - Liang, Y. F.
AU - Liang, Y. T.
AU - Liao, G. R.
AU - Libby, J.
AU - Lin, C. X.
AU - Lin, D. X.
AU - Liu, B.
AU - Liu, B. J.
AU - Liu, C. X.
AU - Liu, D.
AU - Liu, F. H.
AU - Liu, Fang
AU - Liu, Feng
AU - Liu, H. B.
AU - Liu, H. L.
AU - Liu, H. M.
AU - Liu, Huanhuan
AU - Liu, Huihui
AU - Liu, J. B.
AU - Liu, J. Y.
AU - Liu, K.
AU - Liu, K. Y.
AU - Liu, Ke
AU - Liu, L. D.
AU - Liu, Q.
AU - Liu, S. B.
AU - Liu, X.
AU - Liu, Y. B.
AU - Liu, Z. A.
AU - Liu, Zhiqing
AU - Long, Y. F.
AU - Lou, X. C.
AU - Lu, H. J.
AU - Lu, J. G.
AU - Lu, Y.
AU - Lu, Y. P.
AU - Luo, C. L.
AU - Luo, M. X.
AU - Luo, X. L.
AU - Lusso, S.
AU - Lyu, X. R.
AU - Ma, F. C.
AU - Ma, H. L.
AU - Ma, L. L.
AU - Ma, M. M.
AU - Ma, Q. M.
AU - Ma, T.
AU - Ma, X. N.
AU - Ma, X. Y.
AU - Ma, Y. M.
AU - Maas, F. E.
AU - Maggiora, M.
AU - Malik, Q. A.
AU - Mao, Y. J.
AU - Mao, Z. P.
AU - Marcello, S.
AU - Meng, Z. X.
AU - Messchendorp, J. G.
AU - Mezzadri, G.
AU - Min, J.
AU - Mitchell, R. E.
AU - Mo, X. H.
AU - Mo, Y. J.
AU - Morales Morales, C.
AU - Muchnoi, N. Yu
AU - Muramatsu, H.
AU - Mustafa, A.
AU - Nefedov, Y.
AU - Nerling, F.
AU - Nikolaev, I. B.
AU - Ning, Z.
AU - Nisar, S.
AU - Niu, S. L.
AU - Niu, X. Y.
AU - Olsen, S. L.
AU - Ouyang, Q.
AU - Pacetti, S.
AU - Pan, Y.
AU - Papenbrock, M.
AU - Patteri, P.
AU - Pelizaeus, M.
AU - Pellegrino, J.
AU - Peng, H. P.
AU - Peng, Z. Y.
AU - Peters, K.
AU - Pettersson, J.
AU - Ping, J. L.
AU - Ping, R. G.
AU - Pitka, A.
AU - Poling, R.
AU - Prasad, V.
AU - Qi, H. R.
AU - Qi, M.
AU - Qi, T. Y.
AU - Qian, S.
AU - Qiao, C. F.
AU - Qin, N.
AU - Qin, X. S.
AU - Qin, Z. H.
AU - Qiu, J. F.
AU - Rashid, K. H.
AU - Redmer, C. F.
AU - Richter, M.
AU - Ripka, M.
AU - Rolo, M.
AU - Rong, G.
AU - Rosner, Ch
AU - Sarantsev, A.
AU - Savrié, M.
AU - Schnier, C.
AU - Schoenning, K.
AU - Shan, W.
AU - Shan, X. Y.
AU - Shao, M.
AU - Shen, C. P.
AU - Shen, P. X.
AU - Shen, X. Y.
AU - Sheng, H. Y.
AU - Shi, X.
AU - Song, J. J.
AU - Song, W. M.
AU - Song, X. Y.
AU - Sosio, S.
AU - Sowa, C.
AU - Spataro, S.
AU - Sun, G. X.
AU - Sun, J. F.
AU - Sun, L.
AU - Sun, S. S.
AU - Sun, X. H.
AU - Sun, Y. J.
AU - Sun, Y. K.
AU - Sun, Y. Z.
AU - Sun, Z. J.
AU - Sun, Z. T.
AU - Tan, Y. T.
AU - Tang, C. J.
AU - Tang, G. Y.
AU - Tang, X.
AU - Tapan, I.
AU - Tiemens, M.
AU - Tsednee, B.
AU - Uman, I.
AU - Varner, G. S.
AU - Wang, B.
AU - Wang, B. L.
AU - Wang, D.
AU - Wang, D. Y.
AU - Wang, Dan
AU - Wang, K.
AU - Wang, L. L.
AU - Wang, L. S.
AU - Wang, M.
AU - Wang, Meng
AU - Wang, P.
AU - Wang, P. L.
AU - Wang, W. P.
AU - Wang, X. F.
AU - Wang, Y.
AU - Wang, Y. D.
AU - Wang, Y. F.
AU - Wang, Y. Q.
AU - Wang, Z.
AU - Wang, Z. G.
AU - Wang, Z. Y.
AU - Wang, Zongyuan
AU - Weber, T.
AU - Wei, D. H.
AU - Wei, J. H.
AU - Weidenkaff, P.
AU - Wen, S. P.
AU - Wiedner, U.
AU - Wolke, M.
AU - Wu, L. H.
AU - Wu, L. J.
AU - Wu, Z.
AU - Xia, L.
AU - Xia, Y.
AU - Xiao, D.
AU - Xiao, Y. J.
AU - Xiao, Z. J.
AU - Xie, Y. G.
AU - Xie, Y. H.
AU - Xiong, X. A.
AU - Xiu, Q. L.
AU - Xu, G. F.
AU - Xu, J. J.
AU - Xu, L.
AU - Xu, Q. J.
AU - Xu, Q. N.
AU - Xu, X. P.
AU - Yan, F.
AU - Yan, L.
AU - Yan, W. B.
AU - Yan, W. C.
AU - Yan, Y. H.
AU - Yang, H. J.
AU - Yang, H. X.
AU - Yang, L.
AU - Yang, Y. H.
AU - Yang, Y. X.
AU - Yang, Yifan
AU - Ye, M.
AU - Ye, M. H.
AU - Yin, J. H.
AU - You, Z. Y.
AU - Yu, B. X.
AU - Yu, C. X.
AU - Yu, J. S.
AU - Yuan, C. Z.
AU - Yuan, Y.
AU - Yuncu, A.
AU - Zafar, A. A.
AU - Zeng, Y.
AU - Zeng, Z.
AU - Zhang, B. X.
AU - Zhang, B. Y.
AU - Zhang, C. C.
AU - Zhang, D. H.
AU - Zhang, H. H.
AU - Zhang, H. Y.
AU - Zhang, J.
AU - Zhang, J. L.
AU - Zhang, J. Q.
AU - Zhang, J. W.
AU - Zhang, J. Y.
AU - Zhang, J. Z.
AU - Zhang, K.
AU - Zhang, L.
AU - Zhang, S. Q.
AU - Zhang, X. Y.
AU - Zhang, Y.
AU - Zhang, Y. H.
AU - Zhang, Y. T.
AU - Zhang, Yang
AU - Zhang, Yao
AU - Zhang, Yu
AU - Zhang, Z. H.
AU - Zhang, Z. P.
AU - Zhang, Z. Y.
AU - Zhao, G.
AU - Zhao, J. W.
AU - Zhao, J. Y.
AU - Zhao, J. Z.
AU - Zhao, Lei
AU - Zhao, Ling
AU - Zhao, M. G.
AU - Zhao, Q.
AU - Zhao, S. J.
AU - Zhao, T. C.
AU - Zhao, Y. B.
AU - Zhao, Z. G.
AU - Zhemchugov, A.
AU - Zheng, B.
AU - Zheng, J. P.
AU - Zheng, Y. H.
AU - Zhong, B.
AU - Zhou, L.
AU - Zhou, Q.
AU - Zhou, X.
AU - Zhou, X. K.
AU - Zhou, X. R.
AU - Zhou, X. Y.
AU - Zhu, A. N.
AU - Zhu, J.
AU - Zhu, K.
AU - Zhu, K. J.
AU - Zhu, S.
AU - Zhu, S. H.
AU - Zhu, X. L.
AU - Zhu, Y. C.
AU - Zhu, Y. S.
AU - Zhu, Z. A.
AU - Zhuang, J.
AU - Zou, B. S.
AU - Zou, J. H.
N1 - Funding Information: The BESIII Collaboration thanks the staff of BEPCII, the IHEP computing center and the supercomputing center of USTC for their strong support. This work is supported in part by the National Key Basic Research Program of China under Contract No. 2015CB856700; the National Natural Science Foundation of China (NSFC) under Contracts No. 11235011, No. 11335008, No. 11375205, No. 11425524, No. 11625523, No. 11635010, No. 11322544, No. 11375170, No. 11275189, No. 11475164, No. 11475169, No. 11605196, and No. 11605198; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; the CAS Center for Excellence in Particle Physics (CCEPP); Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No. U1332201, No. U1532257, No. U1532258, and No. U1532102; CAS under Contracts No. KJCX2-YW-N29, No. KJCX2-YW-N45, and No. QYZDJ-SSW-SLH003; the 100 Talents Program of CAS; the National 1000 Talents Program of China; INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology; German Research Foundation DFG under Collaborative Research Center Contracts No. CRC 1044 and No. FOR 2359; Istituto Nazionale di Fisica Nucleare, Italy; Koninklijke Nederlandse Akademie van Wetenschappen (KNAW) under Contract No. 530-4CDP03; the Ministry of Development of Turkey under Contract No. DPT2006K-120470; the National Natural Science Foundation of China (NSFC) under Contracts No. 11505034 and No. 11575077; the National Science and Technology fund; the Swedish Research Council; the U.S. Department of Energy under Contracts No. DE-FG02-05ER41374, No. DE-SC-0010118, No. DE-SC-0010504, and No. DE-SC-0012069; the University of Groningen (RuG) and the Helmholtzzentrum fuer Schwerionenforschung GmbH (GSI), Darmstadt; and the WCU Program of the National Research Foundation of Korea under Contract No. R32-2008-000-10155-0. Funding Information: This work is supported in part by the National Key Basic Research Program of China under Contract No.2015CB856700; the National Natural Science Foundation of China (NSFC) under Contracts No.11235011, No.11335008, No.11375205, No.11425524, No.11625523, No.11635010, No.11322544, No.11375170, No.11275189, No.11475164, No.11475169, No.11605196, and No.11605198; the Chinese Academy of Sciences (CAS) Large-Scale Scientific Facility Program; the CAS Center for Excellence in Particle Physics (CCEPP); Joint Large-Scale Scientific Facility Funds of the NSFC and CAS under Contracts No.U1332201, No.U1532257, No.U1532258, and No.U1532102; CAS under Contracts No.KJCX2-YW-N29, No.KJCX2-YW-N45, and No.QYZDJ-SSW-SLH003; the 100 Talents Program of CAS; the National 1000 Talents Program of China; INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology; German Research Foundation DFG under Collaborative Research Center Contracts No.CRC 1044 and No.FOR 2359; Istituto Nazionale di Fisica Nucleare, Italy; Koninklijke Nederlandse Akademie van Wetenschappen (KNAW) under Contract No.530-4CDP03; the Ministry of Development of Turkey under Contract No.DPT2006K-120470; the National Natural Science Foundation of China (NSFC) under Contracts No.11505034 and No.11575077; the National Science and Technology fund; the Swedish Research Council; the U.S. Department of Energy under Contracts No.DE-FG02-05ER41374, No.DE-SC-0010118, No.DE-SC-0010504, and No.DE-SC-0012069; the University of Groningen (RuG) and the Helmholtzzentrum fuer Schwerionenforschung GmbH (GSI), Darmstadt; and the WCU Program of the National Research Foundation of Korea under Contract No.R32-2008-000-10155-0. Publisher Copyright: © 2018 authors. Published by the American Physical Society.
PY - 2018/3/29
Y1 - 2018/3/29
N2 - The cross section of the e+e-→Λc+Λc- process is measured with unprecedented precision using data collected with the BESIII detector at s=4574.5, 4580.0, 4590.0 and 4599.5 MeV. The nonzero cross section near the Λc+Λc- production threshold is cleared. At center-of-mass energies s=4574.5 and 4599.5 MeV, the higher statistics data enable us to measure the Λc polar angle distributions. From these, the Λc electric over magnetic form-factor ratios (|GE/GM|) 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.
AB - The cross section of the e+e-→Λc+Λc- process is measured with unprecedented precision using data collected with the BESIII detector at s=4574.5, 4580.0, 4590.0 and 4599.5 MeV. The nonzero cross section near the Λc+Λc- production threshold is cleared. At center-of-mass energies s=4574.5 and 4599.5 MeV, the higher statistics data enable us to measure the Λc polar angle distributions. From these, the Λc electric over magnetic form-factor ratios (|GE/GM|) 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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U2 - 10.1103/PhysRevLett.120.132001
DO - 10.1103/PhysRevLett.120.132001
M3 - Article
C2 - 29694170
AN - SCOPUS:85044868310
VL - 120
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 13
M1 - 132001
ER -