Experimental upper limits for the hadronic transitions Upsilon(2 S)-->etaUpsilon(1 S) and Upsilon(2 S)-->pi0Upsilon(1 S)
B Lurz,D Antreasyan,D Besset,J K Bienlein,E D Bloom,I Brock,R Cabenda,A M Cartacci,M Cavallisforza,R Clare,G Conforto,Seth Cooper,R Cowan,D G Coyne,C M Edwards,A Engler,G Folger, A M Fridman,James E Gaiser,D Gelphman,G Godfrey,F H Heimlich,R Hofstadter,J Irion,Z Jakubowski,S Keh,H G Kilian,I Kirkbride,Thomas Kloiber,Walter J Koch,A C Konig,K C Konigsmann,R W Kraemer,Richard T Lee,S R Leffler,R Lekebusch,A M Litke,W S Lockman,Stephen T Lowe,D Marlow,W Maschmann,Toshiyuki Matsui,F Messing,W James Metzger,B Monteleoni,R Nernst,B B Niczyporuk,G Nowak,C W Peck,P G Pelfer,Bruce G Pollock,F C Porter,D Prindle,P N Ratoff,B Renger,C Rippich,Milton D Scheer,P Schmitt,J Schotanus,Albert Schwarz,D Sievers,T Skwarnicki,K Strauch,U Strohbusch,J C Tompkins,H J Trost,R T Van De Walle,H Vogel,U Volland,K Wacker,W Walk,H Wegener,D C Williams,P Zschorsch European Physical Journal C（1987）
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