Precision Measurements of the Timelike Electromagnetic Form Factors of Pion, Kaon, and Proton

Details Precision Measurements of the Timelike Electromagnetic Form Factors of Pion, Kaon, and Proton Precision Measurements of the Timelike Electromagnetic Form Factors of Pion, Kaon, and Proton

2005-10-03

arxiv.org/abs/hep-ex/0510005v2

Phys.Rev.Lett.95:261803,2005

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages postscript,also available through thishttp://www.lns.cornell.edu/public/CLNS/2005/, Submitted to PRL

Scientific paper

10.1103/PhysRevLett.95.261803

Using 20.7 pb^-1 of e+e- annihilation data taken at sqrt{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 |Q^2| = 13.48 GeV^2 by the reaction e+e- to h+h-. The measurements are the first ever with identified pions and kaons of |Q^2| > 4 GeV^2, with the results F_pi(13.48 GeV^2) = 0.075+-0.008(stat)+-0.005(syst) and F_K(13.48 GeV^2) = 0.063+-0.004(stat)+-0.001(syst). The result for the proton, assuming G^p_E = G^p_M, is G^p_M(13.48 GeV^2) = 0.014+-0.002(stat)+-0.001(syst), which is in agreement with earlier results.

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