Experimental upper limits for hadronic and axion decays of the γ(1 S)

B. Niczyporuk, Z. Jakubowski, T. Zełudziewicz, 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. SchotanusM. 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

Research output: Contribution to journalArticlepeer-review


A search for the decays γ→ρπ, γ→J/ψX and γ→γa (where X 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.

Original languageEnglish
Pages (from-to)197-202
Number of pages6
JournalEuropean Physical Journal C
Issue number3
StatePublished - Sep 1983


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