Particle physics experiment demonstrates precision timelike electromagnetic form factors for pions, kaons, and protons, highlighting hadron internal structure at high momentum transfer.
Using 20.7 pb^-1 of e⁺e^- annihilation data taken at √s=3.671 GeV with the CLEO-c detector, precision measurements of the electromagnetic form factors of the charged pion, charged kaon, and proton have been made for timelike momentum transfer of |Q²|=13.48 GeV² by the reaction e⁺e^-→h⁺h^-. The measurements are the first ever with identified pions and kaons of |Q²|>4 GeV², with the results F_π(13.48 GeV²)=0.075±0.008(stat)±0.005(syst) and FK(13.48 GeV²)=0.063±0.004(stat)±0.001(syst). The result for the proton, assuming GEᵖ=GMᵖ, is GMᵖ(13.48 GeV²)=0.014±0.002(stat)±0.001(syst), which is in agreement with earlier results.
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Pedlar et al. (2005) studied this question.
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