摘要
Using a procedure based on interpolation via continued fractions supplemented by statistical sampling,we analyze proton magnetic form factor data obtained via electron+proton scattering on Q^(2)∈[0.027,0.55]GeV^(2)with the goal of determining the proton magnetic radius.The approach avoids assumptions about the function form used for data interpolation and ensuing extrapolation onto Q^(2)■0 for extraction of the form factor slope.In this way,we find r_(M)=0.817(27)fm.Regarding the difference between proton electric and magnetic radii calculated in this way,extant data are seen to be compatible with the possibility that the slopes of the proton Dirac and Pauli form factors,F1,2(Q^(2)),are not truly independent observables;to wit,the difference F_(1)’(0)-F_(2)’(0)/κp=[1+Kp]/[4 m_(p)^(2)],viz.,the proton Foldy term.
作者
Zhu-Fang Cui
Daniele Binosi
Craig D.Roberts
Sebastian M.Schmidt
崔著钫;Daniele Binosi;Craig D.Roberts;Sebastian M.Schmidt(School of Physics,Nanjing University,Nanjing 210093,China;Institute for Nonperturbative Physics,Nanjing University,Nanjing 210093,China;European Centre for Theoretical Studies in Nuclear Physics and Related Areas,Villa Tambosi,Strada delle Tabarelle 286,I-38123 Villazzano(TN),Italy;Helmholtz-Zentrum Dresden-Rossendorf,Dresden D-01314,Germany;RWTH Aachen University,Ⅲ.Physikalisches Institut B,Aachen D-52074,Germany)
基金
Supported by the National Natural Science Foundation of China(Grant Nos.12135007 and 11805097)
the Natural Science Foundation of Jiangsu Province,China(Grant No.BK20180323)
STRONG-2020,“the strong interaction at the frontier of knowledge:fundamental research and applications”which received funding from the European Union’s Horizon 2020 Research and Innovation Programme(Grant No.824093)。
