Measurement of the cross section for <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msup><mml:mi>e</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo>→</mml:mo><mml:mi>p</mml:mi><mml:mover accent="true"><mml:mi>p</mml:mi><mml:mo>¯</mml:mo></mml:mover></mml:math> at center-of-mass energies from 2.0 to 3.07 GeV

Ablikim, M.; Bai, J. Z.; Ban, Y.; Bian, J. G.; Cai, X.; Chen, H.F.; Chen, H.S.; Chen, H.X.; Chen, J.C.; Chen, Jin; Chen, Y.B.; Chi, S.; Chu, Y. P.; Cui, X. Z.; Dai, Y. S.; Deng, Z. Y.; Liu, Dong; Dong, Qingshun; Du, S. X.; Du, Z. Z.; Fang, J.; Fang, S. S.; Fu, C. D.; Gao, C. S.; Gao, Y.; Gu, S.; Gu, Y. T.; Guo, Y. N.; Guo, Y. Q.; Guo, Z. J.; Harris, F. A.; He, K. L.; He, M.; Heng, Y. K.; Hu, H. M.; Hu, T.; Huang, G. S.; Huang, X. P.; Huang, X. T.; Ji, Xiangdong; Jiang, X. S.; Jiao, J. B.; Jin, D. P.; Jin, S.; Jin, Y.; Lai, Y. F.; Li, G.; Li, H.B.; Li, H.H.; Li, J.; Li, R.Y.; Li, S.M.; Li, W.D.; Li, W.G.; Li, X.L.; Li, X.Q.; Li, Y.L.; Liang, Y. F.; Liao, H.; Liu, C.X.; Liu, F.; Liu, Fang; Liu, H.H.; Liu, H.M.; Liu, J.; Liu, J.B.; Liu, J.P.; Liu, R.G.; Liu, Z.A.; Lu, F. X.; Lu, G. R.; Lü, H. J.; Lu, J. G.; Luo, C. L.; Ma, F.C.; Ma, Hailong; Ma, L.L.; Ma, Qiumei; Ma, X.B.; Mao, Z. P.; Mo, X. H.; Nie, J.; Olsen, S. L.; Peng, H.; Qi, N. D.; Qin, H.; Qiu, J. F.; Ren, Z.; Rong, G.; Shan, L. Y.; Shang, L.; Shen, D. L.; Shen, X. Y.; Sheng, H. Y.; Shi, Feng; Shi, X.; Sun, H.; Sun, J. F.; Sun, S. S.; Sun, Y. Z.; Sun, Z. J.; Tan, Zhengguo; Tang, X.; Tian, Yang; Tong, G. L.; Varner, G.; Wang, D.Y.; Wang, L.; Wang, L.S.; Wang, M.; Wang, P.; Wang, P.L.; Wang, W.F.; Wang, Y.F.; Wang, Z.; Wang, Z.Y.; Wang, Zhe; Wang, Zheng; Chen, Wei; Wei, D. H.; Wu, N.; Xia, X. M.; Xie, X. X.; Xin, B.; Xu, G. F.; Yin, Xuefeng; Yan, Mu-Lin; Yang, F.; Yang, H. X.; Yang, J.; Yang, Yifan; Ye, M.H.; Ye, Y.X.; Yi, Z. Y.; Yu, G.; Yuan, C. Z.; Yuan, J. M.; Yuan, Y.; Zang, S. L.; Zeng, Y.; Zhang, B.X.; Zhang, B.Y.; Zhang, C.C.; Zhang, D.H.; Zhang, H.Y.; Zhang, J.W.; Zhang, J.Y.; Zhang, Q.J.; Zhang, X.M.; Zhang, X.Y.; Zhang, Yiyun; Zhang, Z.P.; Zhang, Z.Q.; Zhao, Dongxu; Zhao, J. W.; Zhao, M. G.; Zhao, P. P.; Zhao, W. R.; Zhao, Z.; Zheng, Han-Qing; Zheng, J. P.; Zheng, Z. P.; Li, Zhou; Zhou, Na; Zhu, K.; Zhu, Q. M.; Zhu, Y. S.; Zhu, Y.; Zhu, Z. A.; Zhuang, B. A.; Zhuang, X.; Zou, B. S.

doi:10.1016/j.physletb.2005.09.044

Cited by 62 publications

(40 citation statements)

References 17 publications

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“…3 and is shown in Fig. 1 (a) together with previous experimental results [11,12,13,14,15,16,17]. A fit to the polar angular distribution of the proton in c.m.…”

Section: Nucleon Form Factorssupporting

confidence: 54%

Measurements of hadron form factors at BESIII

Morales¹

2016

AIP Conference Proceedings

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Abstract. BEPCII is a symmetric e + e − -collider located in Beijing running at center-of-mass energies between 2.0 and 4.6 GeV. This energy range allows the BESIII-experiment to measure hadron form factors both from direct e + e − -annihilation and from initial state radiation processes. In this paper, results on e + e − → pp based on data collected by BESIII in 2011 and 2012 are presented. We also present preliminary results on e + e − → ΛΛ based on the same data samples at 4 center-of-mass energies. BESIII results obtained from e + e − → π + π − using the initial state radiation technique at the center-of-mass energy of 3.773 GeV are also summarized. Finally, expectations on the measurement of baryon electromagnetic form factors from the BESIII high luminosity energy scan in 2015 and from initial state radiation processes at different center-of-mass energies are also explained.

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“…3 and is shown in Fig. 1 (a) together with previous experimental results [11,12,13,14,15,16,17]. A fit to the polar angular distribution of the proton in c.m.…”

Section: Nucleon Form Factorssupporting

confidence: 54%

Measurements of hadron form factors at BESIII

Morales¹

2016

AIP Conference Proceedings

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“…Using the e + e − → pp data from [101], we perform the integral from t = 4.0 GeV 2 to 9.4 GeV 2 as a discrete sum, using the measured values of σ(t) plus the 1σ error. We find |δa p k | ≤ 0.013.…”

mentioning

confidence: 99%

Model independent extraction of the proton magnetic radius from electron scattering

2014

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We combine constraints from analyticity with experimental electron-proton scattering data to determine the proton magnetic radius without model-dependent assumptions on the shape of the form factor. We also study the impact of including electron-neutron scattering data, and ππ → NN data. Using representative datasets we find for a cut of Q 2 ≤ 0.5 GeV 2 , r p M = 0.91 +0.03 −0.06 ± 0.02 fm using just proton scattering data; r p M = 0.87 +0.04 −0.05 ± 0.01 fm adding neutron data; and r p M = 0.87 +0.02 −0.02 fm adding ππ data. We also extract the neutron magnetic radius from these data sets obtaining r n M = 0.89 +0.03 −0.03 fm from the combined proton, neutron, and ππ data.

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“…Nine sets of data have been considered, six of them lie in the space-like region [12] and three in the time-like region [13][14][15][16][17][18][19][20][21]. The data determine the Sachs EMFF's and their ratios.…”

Section: Resultsmentioning

confidence: 99%

“…The proton-antiproton production experiments were of two types, 1) the exclusive pair production [13][14][15][16][17][18][19][20] and 2) production of the pair with a photon [21]. In the latter case the pair production energy is obtained by assuming that the photon was produced by the electron or positron and that no other photons were emitted but undetected.…”

Section: Resultsmentioning

confidence: 99%

Timelike and spacelike electromagnetic form factors of nucleons, a unified description

Lomon

Pacetti

2012

Phys. Rev. D

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The extended Lomon-Gari-Krümpelmann model of nucleon electromagnetic form factors, which embodies ρ, ρ ′ , ω, ω ′ and φ vector meson contributions and the perturbative QCD high momentum transfer behavior has been extended to the time-like region. Breit-Wigner formulae with momentum-dependent widths have been considered for broad resonances in order to have a parametrization for the electromagnetic form factors that fulfills, in the time-like region, constraints from causality, analyticity, and unitarity.This analytic extension of the Lomon-Gari-Krümpelmann model has been used to perform a unified fit to all the nucleon electromagnetic form factor data, in the space-like and time-like region (where form factor values are extracted from e + e − ↔ N N cross sections data). The knowledge of the complete analytic structure of form factors enables predictions at extended momentum transfer, and also of time-like observables such as the ratio between electric and magnetic form factors and their relative phase.

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Measurement of the cross section for e+e−→pp¯ at center-of-mass energies from 2.0 to 3.07 GeV

Cited by 62 publications

References 17 publications

Measurements of hadron form factors at BESIII

Measurements of hadron form factors at BESIII

Model independent extraction of the proton magnetic radius from electron scattering

Timelike and spacelike electromagnetic form factors of nucleons, a unified description

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