4 research outputs found
Spin density matrix of the Ï in the reaction pÂŻpâÏÏ0
- Author
- Amsler C.Physik-Institut der UniversitĂ€t ZĂŒrich, 8057, Zurich, Switzerland
- Heinsius F. H.(Ruhr-UniversitÀt Bochum, 44801, Bochum, Germany)
- Koch H.(Ruhr-UniversitÀt Bochum, 44801, Bochum, Germany)
- Kopf B.(Ruhr-UniversitÀt Bochum, 44801, Bochum, Germany)
- Kurilla U.(Ruhr-UniversitÀt Bochum, 44801, Bochum, Germany)
- Meyer C. A.(Carnegie Mellon University, 15213, Pittsburgh, PS, USA)
- Peters K.(Ruhr-UniversitÀt Bochum, 44801, Bochum, Germany)
- Pychy J.(Ruhr-UniversitÀt Bochum, 44801, Bochum, Germany)
- Steinke M.(Ruhr-UniversitÀt Bochum, 44801, Bochum, Germany)
- Wiedner U.(Ruhr-UniversitÀt Bochum, 44801, Bochum, Germany)
- Publication venue
- Publication date
- Field of study
The spin density matrix of the Ï has been determined for the reaction pÂŻpâÏÏ0 with unpolarized in-flight data measured by the Crystal Barrel LEAR experiment at CERN. The two main decay modes of the Ï into Ï0Îł and Ï+Ï-Ï0 have been separately analyzed for various pÂŻ momenta between 600 and 1940 MeV/c. The results obtained with the usual method by extracting the matrix elements via the Ï decay angular distributions and with the more sophisticated method via a full partial wave analysis are in good agreement. A strong spin alignment of the Ï is clearly visible in this energy regime and all individual spin density matrix elements exhibit an oscillatory dependence on the production angle. In addition, the largest contributing orbital angular momentum of the pÂŻp system has been identified for the different beam momenta. It increases from LpÂŻpmax = 2 at 600 MeV/c to LpÂŻpmax = 5 at 1940 MeV/c
The polarization observables T , P , and H and their impact on ÎłpâpÏ0 multipoles
- Author
- Anisovich A.V.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Bayadilov D.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Beck R.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Becker M.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Beloglazov Y.(Petersburg Nuclear Physics Institute, Gatchina, 188300, Russia)
- Berlin A.(Institut fĂŒr Experimentalphysik I, RuhrâUniversitĂ€t Bochum, Bochum, 44780, Germany)
- Bichow M.(Institut fĂŒr Experimentalphysik I, RuhrâUniversitĂ€t Bochum, Bochum, 44780, Germany)
- Brinkmann K.-Th.(II. Physikalisches Institut, UniversitĂ€t GieĂen, GieĂen, 35392, Germany)
- Böse S.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Crede V.(Department of Physics, Florida State University, Tallahassee, FL, 32306, USA)
- Dieterle M.(Department Physik, UniversitÀt Basel, Basel, 4056, Switzerland)
- Dutz H.(Physikalisches Institut, UniversitÀt Bonn, Bonn, 53115, Germany)
- Eberhardt H.(Physikalisches Institut, UniversitÀt Bonn, Bonn, 53115, Germany)
- Elsner D.(Physikalisches Institut, UniversitÀt Bonn, Bonn, 53115, Germany)
- Fornet-Ponse K.(Physikalisches Institut, UniversitÀt Bonn, Bonn, 53115, Germany)
- Friedrich St.(II. Physikalisches Institut, UniversitĂ€t GieĂen, GieĂen, 35392, Germany)
- Frommberger F.(Physikalisches Institut, UniversitÀt Bonn, Bonn, 53115, Germany)
- Funke Ch.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Goertz St.(Physikalisches Institut, UniversitÀt Bonn, Bonn, 53115, Germany)
- Gottschall M.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Gridnev A.(Petersburg Nuclear Physics Institute, Gatchina, 188300, Russia)
- GrĂŒner M.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Gutz E.(II. Physikalisches Institut, UniversitĂ€t GieĂen, GieĂen, 35392, Germany)
- Hammann Ch.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Hannappel J.(Physikalisches Institut, UniversitÀt Bonn, Bonn, 53115, Germany)
- Hannen V.(II. Physikalisches Institut, UniversitĂ€t GieĂen, GieĂen, 35392, Germany)
- Hartmann J.HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany
- Herick J.(Institut fĂŒr Experimentalphysik I, RuhrâUniversitĂ€t Bochum, Bochum, 44780, Germany)
- Hillert W.(Physikalisches Institut, UniversitÀt Bonn, Bonn, 53115, Germany)
- Hoffmeister Ph.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Honisch Ch.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Jahn O.(Physikalisches Institut, UniversitÀt Bonn, Bonn, 53115, Germany)
- Jude T.(Physikalisches Institut, UniversitÀt Bonn, Bonn, 53115, Germany)
- Kaiser D.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Kalinowsky H.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Kalischewski F.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Keshelashvili I.(Department Physik, UniversitÀt Basel, Basel, 4056, Switzerland)
- Klassen P.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Klein F.(Physikalisches Institut, UniversitÀt Bonn, Bonn, 53115, Germany)
- Klempt E.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Koop K.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Krusche B.(Department Physik, UniversitÀt Basel, Basel, 4056, Switzerland)
- Kube M.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- KÀser A.(Department Physik, UniversitÀt Basel, Basel, 4056, Switzerland)
- Lang M.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Lopatin I.(Petersburg Nuclear Physics Institute, Gatchina, 188300, Russia)
- Makonyi K.(II. Physikalisches Institut, UniversitĂ€t GieĂen, GieĂen, 35392, Germany)
- Messi F.(Physikalisches Institut, UniversitÀt Bonn, Bonn, 53115, Germany)
- Metag V.(II. Physikalisches Institut, UniversitĂ€t GieĂen, GieĂen, 35392, Germany)
- Meyer W.(Institut fĂŒr Experimentalphysik I, RuhrâUniversitĂ€t Bochum, Bochum, 44780, Germany)
- MĂŒller J.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Nanova M.(II. Physikalisches Institut, UniversitĂ€t GieĂen, GieĂen, 35392, Germany)
- Nikonov V.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Novinski D.(Petersburg Nuclear Physics Institute, Gatchina, 188300, Russia)
- Novotny R.(II. Physikalisches Institut, UniversitĂ€t GieĂen, GieĂen, 35392, Germany)
- Piontek D.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Reeve S.(Physikalisches Institut, UniversitÀt Bonn, Bonn, 53115, Germany)
- Reicherz G.(Institut fĂŒr Experimentalphysik I, RuhrâUniversitĂ€t Bochum, Bochum, 44780, Germany)
- Rosenbaum Ch.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Rostomyan T.(Department Physik, UniversitÀt Basel, Basel, 4056, Switzerland)
- Roth B.(Institut fĂŒr Experimentalphysik I, RuhrâUniversitĂ€t Bochum, Bochum, 44780, Germany)
- Runkel St.(Physikalisches Institut, UniversitÀt Bonn, Bonn, 53115, Germany)
- Sarantsev A.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Schmidt Ch.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Schmieden H.(Physikalisches Institut, UniversitÀt Bonn, Bonn, 53115, Germany)
- Schmitz R.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Seifen T.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Sokhoyan V.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Thiel A.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Thoma U.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- ThĂ€mer Ph.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Urban M.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- van Pee H.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Walther D.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Wendel Ch.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Wiedner U.(Institut fĂŒr Experimentalphysik I, RuhrâUniversitĂ€t Bochum, Bochum, 44780, Germany)
- Wilson A.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Winnebeck A.(HelmholtzâInstitut fĂŒr Strahlenâund Kernphysik, UniversitĂ€t Bonn, Bonn, 53115, Germany)
- Witthauer L.(Department Physik, UniversitÀt Basel, Basel, 4056, Switzerland)
- Publication venue
- Publication date
- Field of study
Data on the polarization observables T , P , and H for the reaction ÎłpâpÏ0 are reported. Compared to earlier data from other experiments, our data are more precise and extend the covered range in energy and angle substantially. The results were extracted from azimuthal asymmetries measured using a transversely polarized target and linearly polarized photons. The data were taken at the Bonn electron stretcher accelerator ELSA with the CBELSA/TAPS detector. Within the Bonn-Gatchina partial wave analysis, the new polarization data lead to a significant narrowing of the error band for the multipoles for neutral-pion photoproduction
Photoproduction of Ï mesons off the proton
- Author
- Anisovich A.V.(Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- Bacelar J.C.S.(KVI, Groningen, 9747 AA, The Netherlands)
- Bantes B.(Physikalisches Institut, UniversitÀt Bonn, Bonn, D-53115, Germany)
- Bartholomy O.(Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- Bayadilov D.(Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- Beck R.(Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- Beloglazov Y.A.(Petersburg Nuclear Physics Institute, Gatchina, RU-188350, Russia)
- Brinkmann K.T.(II. Physikalisches Institut, UniversitĂ€t GieĂen, GieĂen, D-35392, Germany)
- Castelijns R.(KVI, Groningen, 9747 AA, The Netherlands)
- Crede V.(Department of Physics, Florida State University, Tallahassee, FL, 32306, USA)
- Dutz H.(Physikalisches Institut, UniversitÀt Bonn, Bonn, D-53115, Germany)
- Elsner D.(Physikalisches Institut, UniversitÀt Bonn, Bonn, D-53115, Germany)
- Ewald R.(Physikalisches Institut, UniversitÀt Bonn, Bonn, D-53115, Germany)
- Frommberger F.(Physikalisches Institut, UniversitÀt Bonn, Bonn, D-53115, Germany)
- Fuchs M.(Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- Funke Chr.(Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- Gregor R.(II. Physikalisches Institut, UniversitĂ€t GieĂen, GieĂen, D-35392, Germany)
- Gridnev A.(Petersburg Nuclear Physics Institute, Gatchina, RU-188350, Russia)
- Gutz E.(II. Physikalisches Institut, UniversitĂ€t GieĂen, GieĂen, D-35392, Germany)
- Hannappel J.(Physikalisches Institut, UniversitÀt Bonn, Bonn, D-53115, Germany)
- Hillert W.(Physikalisches Institut, UniversitÀt Bonn, Bonn, D-53115, Germany)
- Hoffmeister P.(Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- Horn I.(Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- Jaegle I.(Physikalisches Institut, UniversitÀt Basel, Basel, CH-4056, Switzerland)
- Jude T.(Physikalisches Institut, UniversitÀt Bonn, Bonn, D-53115, Germany)
- Junkersfeld J.(Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- Kalinowsky H.(Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- Kleber V.(Physikalisches Institut, UniversitÀt Bonn, Bonn, D-53115, Germany)
- Klein Frank(Physikalisches Institut, UniversitÀt Bonn, Bonn, D-53115, Germany)
- Klein Friedrich(Physikalisches Institut, UniversitÀt Bonn, Bonn, D-53115, Germany)
- Klempt E.(Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- Kotulla M.(Physikalisches Institut, UniversitÀt Basel, Basel, CH-4056, Switzerland)
- Krusche B.(Physikalisches Institut, UniversitÀt Basel, Basel, CH-4056, Switzerland)
- Lang M.(Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- Lopatin I.V.(Petersburg Nuclear Physics Institute, Gatchina, RU-188350, Russia)
- Lugert S.(II. Physikalisches Institut, UniversitĂ€t GieĂen, GieĂen, D-35392, Germany)
- Löhner H.(KVI, Groningen, 9747 AA, The Netherlands)
- Mertens T.(Physikalisches Institut, UniversitÀt Basel, Basel, CH-4056, Switzerland)
- Messchendorp J.G.(KVI, Groningen, 9747 AA, The Netherlands)
- Metag V.(II. Physikalisches Institut, UniversitĂ€t GieĂen, GieĂen, D-35392, Germany)
- Nanova M.(II. Physikalisches Institut, UniversitĂ€t GieĂen, GieĂen, D-35392, Germany)
- Nikonov V.A.(Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- Novinski D.(Petersburg Nuclear Physics Institute, Gatchina, RU-188350, Russia)
- Novotny R.(II. Physikalisches Institut, UniversitĂ€t GieĂen, GieĂen, D-35392, Germany)
- Ostrick M.(Physikalisches Institut, UniversitÀt Bonn, Bonn, D-53115, Germany)
- Pant L.M.(II. Physikalisches Institut, UniversitĂ€t GieĂen, GieĂen, D-35392, Germany)
- Pfeiffer M.(II. Physikalisches Institut, UniversitĂ€t GieĂen, GieĂen, D-35392, Germany)
- Roy A.(II. Physikalisches Institut, UniversitĂ€t GieĂen, GieĂen, D-35392, Germany)
- Sarantsev A.V.(Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- Schmidt C.(Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- Schmieden H.(Physikalisches Institut, UniversitÀt Bonn, Bonn, D-53115, Germany)
- Shende S.(KVI, Groningen, 9747 AA, The Netherlands)
- Sokhoyan V.(Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- Sparks N.(Department of Physics, Florida State University, Tallahassee, FL, 32306, USA)
- Sumachev V.V.(Petersburg Nuclear Physics Institute, Gatchina, RU-188350, Russia)
- Szczepanek T.(Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- SĂŒle A.(Physikalisches Institut, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- Thoma U.(Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- Trnka D.(II. Physikalisches Institut, UniversitĂ€t GieĂen, GieĂen, D-35392, Germany)
- van Pee H.(Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- Varma R.(II. Physikalisches Institut, UniversitĂ€t GieĂen, GieĂen, D-35392, Germany)
- Walther D.(Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- Wendel Ch.(Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany)
- Wiedner U.(Institut fĂŒr Experimentalphysik I, Ruhr-UniversitĂ€t Bochum, Bochum, D-44780, Germany)
- Wilson A.Helmholtz-Institut fĂŒr Strahlen- und Kernphysik, UniversitĂ€t Bonn, Bonn, D-53115, Germany
- Publication venue
- Publication date
- Field of study
The differential cross sections and unpolarized spin-density matrix elements for the reaction ÎłpâpÏ were measured using the CBELSA/TAPS experiment for initial photon energies ranging from the reaction threshold to 2.5 GeV. These observables were measured from the radiative decay of the Ï meson, ÏâÏ0Îł . The cross sections cover the full angular range and show the full extent of the t -channel forward rise. The overall shape of the angular distributions in the differential cross sections and unpolarized spin-density matrix elements are in fair agreement with previous data. In addition, for the first time, a beam of linearly-polarized tagged photons in the energy range from 1150 MeV to 1650 MeV was used to extract polarized spin-density matrix elements
Observation of Electromagnetic Dalitz decays J/Ï\to P e^+e^-
- Author
- A. A. Zafar(University of the Punjab)
- A. Calcaterra(19A)
- A. Denig(Johannes Gutenberg University of Mainz)
- A. Kupsc(Uppsala University)
- A. Q. Guo(Nankai university)
- A. Sarantsev(21 d)
- A. Yuncu(36B)
- A. Zallo(19A)
- A. Zhemchugov(21 b)
- B. J. Liu(Institute of High Energy Physics)
- B. Kloss(Johannes Gutenberg University of Mainz)
- B. Kopf( Bochum Ruhr-University, Germany)
- B. S. Zou(Institute of High Energy Physics)
- B. Spruck(Universitaet Giessen)
- B. Wang(Nankai university)
- B. X. Yu(Institute of High Energy Physics)
- B. X. Zhang(Institute of High Energy Physics)
- B. Y. Zhang(Institute of High Energy Physics)
- B. Zheng(University of South China)
- B. Zhong(Nanjing Normal University)
- C. B. Zhang(Hunan University)
- C. C. Zhang(Institute of High Energy Physics)
- C. D. Fu(Institute of High Energy Physics)
- C. Dong(Nankai university)
- C. F. Qiao(University of Chinese Academy of Sciences)
- C. F. Redmer(Johannes Gutenberg University of Mainz)
- C. Geng(University of Science and Technology of China)
- C. H. Li(Institute of High Energy Physics)
- C. Hu(Nanjing Normal University)
- C. J. Tang(Sichuan University)
- C. L. Liu(Carnegie Mellon University)
- C. L. Luo(Nanjing Normal University)
- C. Morales Morales(Helmholtz Institute Mainz)
- C. P. Shen(Beihang University)
- C. Q. Feng(University of Science and Technology of China)
- C. S. Ji(University of Science and Technology of China)
- C. X. Liu(Institute of High Energy Physics)
- C. X. Yu(Nankai university)
- C. Z. Yuan(Institute of High Energy Physics)
- C. Zhang(Nanjing University)
- Cheng Li(University of Science and Technology of China)
- Cui Li(University of Science and Technology of China)
- D. Cronin-Hennessy(University of Minnesota)
- D. Dedovich(Joint Institute for Nuclear Research)
- D. H. Wei(Guangxi Normal University)
- D. H. Zhang(Institute of High Energy Physics)
- D. J. Ambrose(University of Rochester)
- D. Li(Hunan University)
- D. M. Li(Zhengzhou University)
- D. P. Jin(Institute of High Energy Physics)
- D. Toth(University of Minnesota)
- D. Wang(Peking University)
- D. X. Lin(Helmholtz Institute Mainz)
- D. Xiao(Institute of High Energy Physics)
- D. Y. Wang(Peking University)
- E. Boger(21 b)
- E. H. Thorndike(University of Rochester)
- F. A. Harris(University of Hawaii)
- F. C. Ma(Liaoning University)
- F. E. Maas(Helmholtz Institute Mainz)
- F. F. An(Institute of High Energy Physics)
- F. H. Liu(Shanxi University)
- F. Li(Institute of High Energy Physics)
- Fang Liu(Institute of High Energy Physics)
- Feng Liu(Central China Normal University)
- G. Chelkov(21 b)
- G. Chen(Institute of High Energy Physics)
- G. F. Cao(Institute of High Energy Physics)
- G. F. Xu(Institute of High Energy Physics)
- G. Li(Institute of High Energy Physics)
- G. M. Huang(Central China Normal University)
- G. R. Lu(Henan Normal University)
- G. Rong(Institute of High Energy Physics)
- G. S. Huang(University of Science and Technology of China)
- G. S. Varner(University of Hawaii)
- G. X. Sun(Institute of High Energy Physics)
- G. Zhao(Institute of High Energy Physics)
- H. B. Li(Institute of High Energy Physics)
- H. B. Liu(GuangXi University)
- H. Cai(Wuhan University)
- H. H. Liu(Henan University of Science and Technology)
- H. H. Zhang(Sun Yat-Sen University)
- H. J. Lu(Huangshan College)
- H. L. Dai(Institute of High Energy Physics)
- H. L. Lu(Institute of High Energy Physics)
- H. L. Ma(Institute of High Energy Physics)
- H. Liang(University of Science and Technology of China)
- H. Loehner(KVI University of Groningen)
- H. M. Hu(Institute of High Energy Physics)
- H. M. Liu(Institute of High Energy Physics)
- H. Moeini(KVI University of Groningen)
- H. Muramatsu(University of Minnesota)
- H. P. Cheng(Huangshan College)
- H. P. Huang(Wuhan University)
- H. P. Peng(University of Science and Technology of China)
- H. S. Chen(Institute of High Energy Physics)
- H. W. Yu(Peking University)
- H. X. Yang(Institute of High Energy Physics)
- H. Y. Sheng(Institute of High Energy Physics)
- H. Y. Zhang(Institute of High Energy Physics)
- H. Ye(Institute of High Energy Physics)
- I. B. Nikolaev(8 a)
- I. Boyko(Joint Institute for Nuclear Research)
- I. Denysenko(Joint Institute for Nuclear Research)
- I. Tapan(36C)
- I. Uman(36B)
- J. B. Jiao(Shandong University)
- J. B. Wei(Peking University)
- J. C. Chen(Institute of High Energy Physics)
- J. C. Li(Institute of High Energy Physics)
- J. Dong(Institute of High Energy Physics)
- J. F. Chang(Institute of High Energy Physics)
- J. F. Hu(Universitaet Giessen)
- J. F. Qiu(Institute of High Energy Physics)
- J. F. Sun(Henan Normal University)
- J. Fang(Institute of High Energy Physics)
- J. G. Lu(Institute of High Energy Physics)
- J. G. Messchendorp(KVI University of Groningen)
- J. H. Zou(Institute of High Energy Physics)
- J. J. Zhang(Institute of High Energy Physics)
- J. L. Fu(Nanjing University)
- J. L. Ping(Nanjing Normal University)
- J. Liu(Institute of High Energy Physics)
- J. M. Bian(University of Minnesota)
- J. Min(Institute of High Energy Physics)
- J. P. Dai(Institute of High Energy Physics)
- J. P. Liu(Wuhan University)
- J. P. Zheng(Institute of High Energy Physics)
- J. Q. Zhang(Institute of High Energy Physics)
- J. S. Huang(Henan Normal University)
- J. S. Lange(Universitaet Giessen)
- J. S. Yu(Lanzhou University)
- J. V. Bennett(Indiana University)
- J. W. Zhang(Institute of High Energy Physics)
- J. W. Zhao(Institute of High Energy Physics)
- J. Y. Zhang(Institute of High Energy Physics)
- J. Z. Bai(Institute of High Energy Physics)
- J. Z. Fan(Tsinghua University)
- J. Z. Zhang(Institute of High Energy Physics)
- J. Zhuang(Institute of High Energy Physics)
- K. Goetzen(GSI Helmholtzcentre for Heavy Ion Research GmbH)
- K. H. Rashid(University of the Punjab)
- K. J. Zhu(Institute of High Energy Physics)
- K. L. He(Institute of High Energy Physics)
- K. Li(Shandong University)
- K. Li(Shandong University)
- K. Liu(Tsinghua University)
- K. Moriya(Indiana University)
- K. Peters(GSI Helmholtzcentre for Heavy Ion Research GmbH)
- K. Schoenning(Uppsala University)
- K. Wang(Institute of High Energy Physics)
- K. Y. Liu(Liaoning University)
- K. Zhu(Institute of High Energy Physics)
- L. B. Guo(Nanjing Normal University)
- L. Fava(45B 45C)
- L. G. Xia(Tsinghua University)
- L. H. Wu(Institute of High Energy Physics)
- L. Huang(Institute of High Energy Physics)
- L. L. Jiang(Institute of High Energy Physics)
- L. L. Wang(Institute of High Energy Physics)
- L. Q. Qin(Shandong University)
- L. S. Wang(Institute of High Energy Physics)
- L. W. Jiang(Wuhan University)
- L. Xu(Institute of High Energy Physics)
- L. Y. Dong(Institute of High Energy Physics)
- L. Yan(University of Science and Technology of China)
- L. Yang(Wuhan University)
- L. Zhou(Institute of High Energy Physics)
- Lei Li(Institute of High Energy Physics)
- Lei Zhao(University of Science and Technology of China)
- Li Zhou(Nankai university)
- Ling Zhao(Institute of High Energy Physics)
- M. AblikimInstitute of High Energy Physics
- M. Albrecht( Bochum Ruhr-University, Germany)
- M. Bertani(19A)
- M. Destefanis(45A 45C)
- M. G. Zhao(Nankai university)
- M. Greco(45A 45C)
- M. H. Gu(Institute of High Energy Physics)
- M. H. Ye(China Center of Advanced Science and Technology)
- M. He(Institute of High Energy Physics)
- M. Kavatsyuk(KVI University of Groningen)
- M. Kornicer(University of Hawaii)
- M. L. Chen(Institute of High Energy Physics)
- M. Lara(Indiana University)
- M. Leyhe( Bochum Ruhr-University, Germany)
- M. Lv(Institute of High Energy Physics)
- M. Maggiora(45A 45C)
- M. N. Achasov(8 a)
- M. Pelizaeus( Bochum Ruhr-University, Germany)
- M. Qi(Nanjing University)
- M. R. Shepherd(Indiana University)
- M. Ripka(Johannes Gutenberg University of Mainz)
- M. Shao(University of Science and Technology of China)
- M. Ullrich(Universitaet Giessen)
- M. Wang(Shandong University)
- M. Werner(Universitaet Giessen)
- M. Wolke(Uppsala University)
- M. X. Luo(Zhejiang University)
- M. Y. Dong(Institute of High Energy Physics)
- M. Ye(Institute of High Energy Physics)
- N. Kalantar-Nayestanaki(KVI University of Groningen)
- N. Q.(Wuhan University)
- N. Wu(Institute of High Energy Physics)
- N. Yu. Muchnoi(8 a)
- O. Albayrak(Carnegie Mellon University)
- O. Bondarenko(KVI University of Groningen)
- O. Cakir(36A)
- O. Fuks(21 b)
- P. L. Liu(Shandong University)
- P. L. Wang(Institute of High Energy Physics)
- P. Larin(Helmholtz Institute Mainz)
- P. R. Li(University of Chinese Academy of Sciences)
- P. Wang(Institute of High Energy Physics)
- P. Weidenkaff(Johannes Gutenberg University of Mainz)
- Q. A. Malik(University of the Punjab)
- Q. An(University of Science and Technology of China)
- Q. Gao(Institute of High Energy Physics)
- Q. J. Li(Institute of High Energy Physics)
- Q. J. Wang(Institute of High Energy Physics)
- Q. J. Xu(Hangzhou Normal University)
- Q. Ji(Institute of High Energy Physics)
- Q. L. Xiu(Institute of High Energy Physics)
- Q. Liu(University of Chinese Academy of Sciences)
- Q. M. Ma(Institute of High Energy Physics)
- Q. N. Xu(University of Chinese Academy of Sciences)
- Q. Ouyang(Institute of High Energy Physics)
- Q. P. Ji(Nankai university)
- Q. W. Zhao(Institute of High Energy Physics)
- Q. Zhao(Institute of High Energy Physics)
- R. A. Briere(Carnegie Mellon University)
- R. Baldini Ferroli(19A)
- R. E. Mitchell(Indiana University)
- R. G. Ping(Institute of High Energy Physics)
- R. Poling(University of Minnesota)
- S. A. Cetin(36B)
- S. B. Liu(University of Science and Technology of China)
- S. Braun(Universitaet Giessen)
- S. G. Wang(Peking University)
- S. H. Zhang(Institute of High Energy Physics)
- S. H. Zhu(Institute of High Energy Physics)
- S. J. Chen(Nanjing University)
- S. J. Zhao(Zhengzhou University)
- S. Jin(Institute of High Energy Physics)
- S. L. Olsen(Seoul National University)
- S. L. Zang(Nanjing University)
- S. Ma(Institute of High Energy Physics)
- S. Nisar(COMSATS Institute of Information Technology)
- S. P. Wen(Institute of High Energy Physics)
- S. P. Yu(Shandong University)
- S. Pacetti(19B)
- S. Qian(Institute of High Energy Physics)
- S. S. Fang(Institute of High Energy Physics)
- S. S. Sun(Institute of High Energy Physics)
- S. Schumann(Johannes Gutenberg University of Mainz)
- S. Spataro(45A 45C)
- S. X. Du(Zhengzhou University)
- T. C. Zhao(Institute of High Energy Physics)
- T. Guo(Nanjing Normal University)
- T. Held( Bochum Ruhr-University, Germany)
- T. Hu(Institute of High Energy Physics)
- T. Hussain(University of the Punjab)
- T. J. Min(Institute of High Energy Physics)
- T. Johansson(Uppsala University)
- T. Li(Shandong University)
- T. Luo(University of Hawaii)
- T. Ma(Institute of High Energy Physics)
- U. Wiedner( Bochum Ruhr-University, Germany)
- W. B. Yan(University of Science and Technology of China)
- W. C. Yan(University of Science and Technology of China)
- W. D. Li(Institute of High Energy Physics)
- W. G. Li(Institute of High Energy Physics)
- W. Gradl(Johannes Gutenberg University of Mainz)
- W. Kuehn(Universitaet Giessen)
- W. L. Yuan(Nanjing University)
- W. Lai(Institute of High Energy Physics)
- W. M. Ding(Shandong University)
- W. M. Song(Institute of High Energy Physics)
- W. Shan(Peking University)
- W. Wang(Institute of High Energy Physics)
- W. X. Gong(Institute of High Energy Physics)
- X. B. Ji(Institute of High Energy Physics)
- X. C. Ai(Institute of High Energy Physics)
- X. C. Lou(1 c)
- X. Cai(Institute of High Energy Physics)
- X. Chen(Institute of High Energy Physics)
- X. D. Ruan(GuangXi University)
- X. F. Wang(Tsinghua University)
- X. H. Mo(Institute of High Energy Physics)
- X. H. Zhao(Nanjing University)
- X. J. Zhang(Institute of High Energy Physics)
- X. K. Chu(Peking University)
- X. K. Zhou(University of Chinese Academy of Sciences)
- X. L. Ji(Institute of High Energy Physics)
- X. L. Kang(Institute of High Energy Physics)
- X. L. Li(Shandong University)
- X. L. Luo(Institute of High Energy Physics)
- X. L. Zhu(Tsinghua University)
- X. Liu(Institute of High Energy Physics)
- X. N. Li(Institute of High Energy Physics)
- X. P. Xu(Soochow University)
- X. Q. Li(Nankai university)
- X. R. Chen(Lanzhou University)
- X. R. Lu(University of Chinese Academy of Sciences)
- X. R. Zhou(University of Science and Technology of China)
- X. S. Jiang(Institute of High Energy Physics)
- X. S. Kang(Nankai university)
- X. S. Qin(Institute of High Energy Physics)
- X. T. Huang(Shandong University)
- X. Tang(Institute of High Energy Physics)
- X. Y. Ma(Institute of High Energy Physics)
- X. Y. Niu(Institute of High Energy Physics)
- X. Y. Shen(Institute of High Energy Physics)
- X. Y. Song(Institute of High Energy Physics)
- X. Y. Zhang(Shandong University)
- X. Y. Zhou(Institute of High Energy Physics)
- X. Zhou(Wuhan University)
- Y. B. Chen(Institute of High Energy Physics)
- Y. B. Liu(Nankai university)
- Y. B. Zhao(Institute of High Energy Physics)
- Y. Ban(Peking University)
- Y. C. Zhu(University of Science and Technology of China)
- Y. D. Wang(19A)
- Y. Ding(Liaoning University)
- Y. F. Liang(Sichuan University)
- Y. F. Wang(Institute of High Energy Physics)
- Y. Fang(Institute of High Energy Physics)
- Y. G. Xie(Institute of High Energy Physics)
- Y. Gao(Tsinghua University)
- Y. H. Guan(Institute of High Energy Physics)
- Y. H. Yan(Hunan University)
- Y. H. Zhang(Institute of High Energy Physics)
- Y. H. Zheng(University of Chinese Academy of Sciences)
- Y. Huang(Nanjing University)
- Y. J. Mao(Peking University)
- Y. J. Mo(Central China Normal University)
- Y. J. Sun(University of Science and Technology of China)
- Y. K. Heng(Institute of High Energy Physics)
- Y. L. Han(Institute of High Energy Physics)
- Y. Lu(Institute of High Energy Physics)
- Y. Nefedov(Joint Institute for Nuclear Research)
- Y. P. Chu(Institute of High Energy Physics)
- Y. P. Guo(Johannes Gutenberg University of Mainz)
- Y. P. Lu(Institute of High Energy Physics)
- Y. Q. Wang(Johannes Gutenberg University of Mainz)
- Y. Qin(Peking University)
- Y. S. Zhu(Institute of High Energy Physics)
- Y. T. Gu(GuangXi University)
- Y. T. Liang(Universitaet Giessen)
- Y. X. Yang(Guangxi Normal University)
- Y. Xia(Hunan University)
- Y. Yang(Central China Normal University)
- Y. Yuan(Institute of High Energy Physics)
- Y. Z. Sun(Institute of High Energy Physics)
- Y. Zeng(Hunan University)
- Y. Zhang(Institute of High Energy Physics)
- Z. A. Liu(Institute of High Energy Physics)
- Z. A. Zhu(Institute of High Energy Physics)
- Z. B. Li(Sun Yat-Sen University)
- Z. G. Wang(Institute of High Energy Physics)
- Z. G. Zhao(University of Science and Technology of China)
- Z. H. Qin(Institute of High Energy Physics)
- Z. H. Wang(University of Science and Technology of China)
- Z. H. Zhang(Central China Normal University)
- Z. J. Sun(Institute of High Energy Physics)
- Z. J. Xiao(Nanjing Normal University)
- Z. Jiao(Huangshan College)
- Z. L. Hou(Institute of High Energy Physics)
- Z. Ning(Institute of High Energy Physics)
- Z. P. Mao(Institute of High Energy Physics)
- Z. P. Zhang(University of Science and Technology of China)
- Z. T. Sun(University of Science and Technology of China)
- Z. Wang(Institute of High Energy Physics)
- Z. Wu(Institute of High Energy Physics)
- Z. Xue(Institute of High Energy Physics)
- Z. Y. Deng(Institute of High Energy Physics)
- Z. Y. He(Nankai university)
- Z. Y. Wang(Institute of High Energy Physics)
- Z. Y. Zhang(Wuhan University)
- Zhiqiang Liu(Institute of High Energy Physics)
- Zhiqing Liu(Johannes Gutenberg University of Mainz)
- Publication venue
- Publication date
- Field of study
Based on a sample of (225.3\pm2.8)\times 10^{6} J/\psi events collected with
the BESIII detector, the electromagnetic Dalitz decays of J/\psi \to P
e^+e^-(P=\eta'/\eta/\pi^0) are studied. By reconstructing the pseudoscalar
mesons in various decay modes, the decays J/\psi \to \eta' e^+e^-, J/\psi \to
\eta e^+e^- and J/\psi \to \pi^0 e^+e^- are observed for the first time. The
branching fractions are determined to be \mathcal{B}(J/\psi\to \eta' e^+e^-) =
(5.81\pm0.16\pm0.31)\times10^{-5}, \mathcal{B}(J/\psi\to \eta e^+e^-) =
(1.16\pm0.07\pm0.06)\times10^{-5}, and \mathcal{B}(J/\psi\to \pi^0
e^+e^-)=(7.56\pm1.32\pm0.50)\times10^{-7}, where the first errors are
statistical and the second ones systematic