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Experimental upper limits for hadronic and axion decays of the γ(1S) |
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| Authors: | B Niczyporuk Z Jakubowski T Ze?udziewicz G Folger B Lurz H Vogel U Volland H Wegener J K Bienlein R Graumann H -J Trost M Schmitz F H Heimlich R Nernst A Schwarz U Strohbusch P Zschorsch K W Chen A C König D J Schotanus M Coles A Engler R W Kraemer D Marlow F Messing C Rippich S Youssef A Fridman G Alexander A Av-Shalom G Bella J Grunhaus W Langguth M Scheer LENA Collaboration |
| Institution: | 1. Institute of Nuclear Physics, Cracow, Poland 2. Physikalisches Institut der Universit?t Erlangen-Nürnberg, D-8520, Erlangen, Federal Republic of Germany 3. Deutsches Elektronen-Synchrotron DESY, D-2000, Hamburg, Federal Republic of Germany 4. I. Institut für Experimentalphysik der Universit?t Hamburg, D-2000, Hamburg, Federal Republic of Germany 5. University of Nijmegen and NIKHEF-Nijmegen, Nijmegen, The Netherlands 6. Department of Physics, Carnegie-Mellon University, 15213, Pittsburgh, PA, USA 7. DPhPE, Centre d'Etudes Nucléaires de Saclay, F-91190, Gif sur Yvette, France 8. Department of Physics and Astronomy, Tel-Aviv University, Israel 9. Physikalisches Institut der Universit?t Würzburg, D-8700, Würzburg, Federal Republic of Germany |
| Abstract: | A search for the decays γ→ρπ, γ→J/ψX and γ→γa (whereX is undetermined and a is an axion) has been completed using the LENA detector at the DORIS storage ring. No evidence for any of these processes was found. For these decay modes we set branching fraction upper limits (90% C.L.) of 2.1×10?3, 2.0×10?2 and 9.1×10?4, respectively. |
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