Precision Measurements of the Timelike Electromagnetic Form Factors of Pion, Kaon, and Proton
Abstract
Using 20.7pb-1 of e+e- annihilation data taken at s=3.671GeV 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|=13.48GeV2 by the reaction e+e-→h+h-. The measurements are the first ever with identified pions and kaons of |Q2|>4GeV2, with the results Fπ(13.48GeV2)=0.075±0.008(stat)±0.005(syst) and FK(13.48GeV2)=0.063±0.004(stat)±0.001(syst). The result for the proton, assuming GEp=GMp, is GMp(13.48GeV2)=0.014±0.002(stat)±0.001(syst), which is in agreement with earlier results.
- Publication:
-
Physical Review Letters
- Pub Date:
- December 2005
- DOI:
- 10.1103/PhysRevLett.95.261803
- arXiv:
- arXiv:hep-ex/0510005
- Bibcode:
- 2005PhRvL..95z1803P
- Keywords:
-
- 13.40.Gp;
- 14.20.Dh;
- 14.40.Aq;
- Electromagnetic form factors;
- Protons and neutrons;
- pi K and eta mesons;
- High Energy Physics - Experiment
- E-Print:
- 9 pages postscript,also available through thishttp://www.lns.cornell.edu/public/CLNS/2005/, Submitted to PRL