Measurements of the Electric and Magnetic Form Factors of the Neutron for Timelike Momentum Transfer. 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Larin , A Lavania , 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 , J W Li , Ke Li , L J Li , L K Li , Lei Li , M H Li , P R Li , S X Li , T Li , W D Li , W G Li , X H Li , X L Li , Xiaoyu Li , Y G Li , Z J Li , Z X Li , Z Y Li , C Liang , H Liang , H Liang , H Liang , Y F Liang , Y T Liang , G R Liao , L Z Liao , J Libby , A Limphirat , D X Lin , T Lin , B X Liu , B J Liu , C Liu , C X Liu , D 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 L 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 , Y Liu , Y B Liu , Z A 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 L Ma , J L Ma , L L Ma , 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摘要
We present the first measurements of the electric and magnetic form factors of the neutron in the timelike (positive q^{2}) region as function of four-momentum transfer. We explored the differential cross sections of the reaction e^{+}e^{-}→n[over ¯]n with data collected with the BESIII detector at the BEPCII accelerator, corresponding to an integrated luminosity of 354.6 pb^{-1} in total at twelve center-of-mass energies between sqrt[s]=2.0-2.95 GeV. A relative uncertainty of 18% and 12% for the electric and magnetic form factors, respectively, is achieved at sqrt[s]=2.3935 GeV. Our results are comparable in accuracy to those from electron scattering in the comparable spacelike region of four-momentum transfer. The electromagnetic form factor ratio R_{em}≡|G_{E}|/|G_{M}| is within the uncertainties close to unity. We compare our result on |G_{E}| and |G_{M}| to recent model predictions, and the measurements in the spacelike region to test the analyticity of electromagnetic form factors.
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neutron, magnetic form factors, momentum transfer
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