Phys. Rev. Lett.
95,
261803
(2005)
[5 pages]
Precision Measurements of the Timelike Electromagnetic Form Factors of Pion, Kaon, and Proton
T. K. Pedlar et al. CLEO Collaboration
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T. K. Pedlar1, D. Cronin-Hennessy2, K. Y. Gao2, D. T. Gong2, J. Hietala2, Y. Kubota2, T. Klein2, B. W. Lang2, S. Z. Li2, R. Poling2, A. W. Scott2, A. Smith2, S. Dobbs3, Z. Metreveli3, K. K. Seth3, A. Tomaradze3, P. Zweber3, J. Ernst4, K. Arms5, H. Severini6, S. A. Dytman7, W. Love7, S. Mehrabyan7, J. A. Mueller7, V. Savinov7, Z. Li8, A. Lopez8, H. Mendez8, J. Ramirez8, G. S. Huang9, D. H. Miller9, V. Pavlunin9, B. Sanghi9, I. P. J. Shipsey9, G. S. Adams10, M. Anderson10, J. P. Cummings10, I. Danko10, J. Napolitano10, Q. He11, H. Muramatsu11, C. S. Park11, E. H. Thorndike11, T. E. Coan12, Y. S. Gao12, F. Liu12, M. Artuso13, C. Boulahouache13, S. Blusk13, J. Butt13, O. Dorjkhaidav13, J. Li13, N. Menaa13, R. Mountain13, K. Randrianarivony13, R. Redjimi13, R. Sia13, T. Skwarnicki13, S. Stone13, J. C. Wang13, K. Zhang13, S. E. Csorna14, G. Bonvicini15, D. Cinabro15, M. Dubrovin15, A. Lincoln15, A. Bornheim16, S. P. Pappas16, A. J. Weinstein16, R. A. Briere17, G. P. Chen17, J. Chen17, T. Ferguson17, G. Tatishvili17, H. Vogel17, M. E. Watkins17, J. L. Rosner18, N. E. Adam19, J. P. Alexander19, K. Berkelman19, D. G. Cassel19, J. E. Duboscq19, K. M. Ecklund19, R. Ehrlich19, L. Fields19, R. S. Galik19, L. Gibbons19, R. Gray19, S. W. Gray19, D. L. Hartill19, B. K. Heltsley19, D. Hertz19, C. D. Jones19, J. Kandaswamy19, D. L. Kreinick19, V. E. Kuznetsov19, H. Mahlke-Krüger19, T. O. Meyer19, P. U. E. Onyisi19, J. R. Patterson19, D. Peterson19, E. A. Phillips19, J. Pivarski19, D. Riley19, A. Ryd19, A. J. Sadoff19, H. Schwarthoff19, X. Shi19, M. R. Shepherd19, S. Stroiney19, W. M. Sun19, T. Wilksen19, K. M. Weaver19, M. Weinberger19, S. B. Athar20, P. Avery20, L. Breva-Newell20, R. Patel20, V. Potlia20, H. Stoeck20, J. Yelton20, P. Rubin21, C. Cawlfield22, B. I. Eisenstein22, I. Karliner22, D. Kim22, N. Lowrey22, P. Naik22, C. Sedlack22, M. Selen22, E. J. White22, J. Williams22, J. Wiss22, D. M. Asner23, K. W. Edwards23, and D. Besson24 (CLEO Collaboration)
1Luther College, Decorah, Iowa 52101, USA
2University of Minnesota, Minneapolis, Minnesota 55455, USA
3Northwestern University, Evanston, Illinois 60208, USA
4State University of New York at Albany, Albany, New York 12222, USA
5The Ohio State University, Columbus, Ohio 43210, USA
6University of Oklahoma, Norman, Oklahoma 73019, USA
7University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
8University of Puerto Rico, Mayaguez, Puerto Rico 00681
9Purdue University, West Lafayette, Indiana 47907, USA
10Rensselaer Polytechnic Institute, Troy, New York 12180, USA
11University of Rochester, Rochester, New York 14627, USA
12Southern Methodist University, Dallas, Texas 75275, USA
13Syracuse University, Syracuse, New York 13244, USA
14Vanderbilt University, Nashville, Tennessee 37235, USA
15Wayne State University, Detroit, Michigan 48202, USA
16California Institute of Technology, Pasadena, California 91125, USA
17Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
18Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637, USA
19Cornell University, Ithaca, New York 14853
20University of Florida, Gainesville, Florida 32611, USA
21George Mason University, Fairfax, Virginia 22030, USA
22University of Illinois, Urbana-Champaign, Illinois 61801, USA
23Carleton University, Ottawa, Ontario, Canada K1S 5B6 and the Institute of Particle Physics, Canada
24University of Kansas, Lawrence, Kansas 66045, USA
Received 30 September 2005; published 21 December 2005
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 Fπ(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.
© 2005 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.261803
DOI:
10.1103/PhysRevLett.95.261803
PACS:
13.40.Gp, 14.20.Dh, 14.40.Aq
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