| Literature DB >> 19257180 |
R E Mitchell1, M R Shepherd, D Besson, T K Pedlar, D Cronin-Hennessy, K Y Gao, J Hietala, Y Kubota, T Klein, B W Lang, R Poling, A W Scott, P Zweber, S Dobbs, Z Metreveli, K K Seth, A Tomaradze, J Libby, A Powell, G Wilkinson, K M Ecklund, W Love, V Savinov, A Lopez, H Mendez, J Ramirez, J Y Ge, D H Miller, I P J Shipsey, B Xin, G S Adams, M Anderson, J P Cummings, I Danko, D Hu, B Moziak, J Napolitano, Q He, J Insler, H Muramatsu, C S Park, E H Thorndike, F Yang, M Artuso, S Blusk, S Khalil, J Li, R Mountain, S Nisar, K Randrianarivony, N Sultana, T Skwarnicki, S Stone, J C Wang, L M Zhang, G Bonvicini, D Cinabro, M Dubrovin, A Lincoln, P Naik, J Rademacker, D M Asner, K W Edwards, J Reed, R A Briere, T Ferguson, G Tatishvili, H Vogel, M E Watkins, J L Rosner, J P Alexander, D G Cassel, J E Duboscq, R Ehrlich, L Fields, R S Galik, L Gibbons, R Gray, S W Gray, D L Hartill, B K Heltsley, D Hertz, J M Hunt, J Kandaswamy, D L Kreinick, V E Kuznetsov, J Ledoux, H Mahlke-Krüger, D Mohapatra, P U E Onyisi, J R Patterson, D Peterson, D Riley, A Ryd, A J Sadoff, X Shi, S Stroiney, W M Sun, T Wilksen, S B Athar, R Patel, J Yelton, P Rubin, B I Eisenstein, I Karliner, S Mehrabyan, N Lowrey, M Selen, E J White, J Wiss.
Abstract
Using 2.45x10;{7} psi(2S) decays collected with the CLEO-c detector at the Cornell Electron Storage Ring we present the most precise measurements of magnetic dipole transitions in the charmonium system. We measure B(psi(2S)-->gammaeta_{c})=(4.32+/-0.16+/-0.60)x10;{-3}, B(J/psi-->gammaeta_{c})/B(psi(2S)-->gammaeta_{c})=4.59+/-0.23+/-0.64, and B(J/psi-->gammaeta_{c})=(1.98+/-0.09+/-0.30)%. We observe a distortion in the eta_{c} line shape due to the photon-energy dependence of the magnetic dipole transition rate. We find that measurements of the eta_{c} mass are sensitive to the line shape, suggesting an explanation for the discrepancy between measurements of the eta_{c} mass in radiative transitions and other production mechanisms.Entities:
Year: 2009 PMID： 19257180 DOI： 10.1103/PhysRevLett.102.011801
Source DB: PubMed Journal: Phys Rev Lett ISSN： 0031-9007 Impact factor: 9.161