Precision measurements of the timelike electromagnetic form factors of pion, kaon, and proton.

/ Authors

T. Pedlar, D. Cronin-Hennessy, K. Gao, D. Gong, J. Hietala, Y. Kubota, T. Klein, B. Lang, S. Li, R. Poling

and 126 more authors

A. Scott, A. Smith, S. Dobbs, Z. Metreveli, K. Seth, A. Tomaradze, P. Zweber, J. Ernst, K. Arms, H. Severini, S. Dytman, W. Love, S. Mehrabyan, J. Mueller, V. Savinov, Z. Li, A. Lopez, H. Mendez, J. Ramirez, G. Huang, D. Miller, V. Pavlunin, B. Sanghi, I. Shipsey, G. Adams, M. Anderson, J. Cummings, I. Dankó, J. Napolitano, Q. He, H. Muramatsu, C. S. Park, E. Thorndike, T. Coan, Y. Gao, F. Liu, M. Artuso, C. Boulahouache, S. Blusk, J. Butt, O. Dorjkhaidav, J. Li, N. Menaa, R. Mountain, K. Randrianarivony, R. Redjimi, R. Sia, T. Skwarnicki, S. Stone, J. Wang, K. Zhang, S. Csorna, G. Bonvicini, D. Cinabro, M. Dubrovin, A. Lincoln, Adi Bornheim, S. Pappas, A. Weinstein, R. Briere, G. Chen, J. Chen, T. Ferguson, G. Tatishvili, H. Vogel, M. E. Watkins, J. Rosner, N. Adam, J. Alexander, K. Berkelman, D. Cassel, J. Duboscq, K. Ecklund, R. Ehrlich, L. Fields, R. Galik, L. Gibbons, R. Gray, S. Gray, D. Hartill, B. Heltsley, D. Hertz, C. Jones, J. Kandaswamy, D. Kreinick, V. Kuznetsov, H. Mahlke-Krüger, T. Meyer, P. Onyisi, J. Patterson, D. Peterson, E. A. Phillips, J. Pivarski, D. Riley, A. Ryd, A. Sadoff, H. Schwarthoff, X. Shi, M. Shepherd, S. Stroiney, W. Sun, T. Wilksen, K. M. Weaver, M. Weinberger, S. Athar, P. Avery, L. Breva-Newell, R. Patel, V. Potlia, H. Stoeck, J. Yelton, P. Rubin, C. Cawlfield, B. Eisenstein, I. Karliner, D. Kim, N. Lowrey, P. Naik, C. Sedlack, M. Selen, E. White, J. Williams, J. Wiss, D. Asner, K. Edwards, D. Besson

/ Abstract

Using 20.7 pb(-1) of e(+)e(-) annihilation data taken at sq.rt(r) = 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(-) --> h(+)h(-). The measurements are the first ever with identified pions and kaons of |Q(2)| > 4 GeV(2), with the results F(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.

Journal: Physical review letters

DOI: 10.1103/PhysRevLett.95.261803