AN AMPLITUDE ANALYSIS OF THE Ii-l?- AND r+r SYSTEMS (Ad < 2 GeV/c2) PRODUCED IN J/$ RADIATIVE DECAY

D M Coffman,F Dejongh, G P Dubois,G Eigen,D G Hitlin,C G Matthews,Jeffrey Richman,W J Wisniewski,Y Zhu,J Drinkard,C Gatto, C A H Eusch, W S Lockman,H F W Sadrozinski,M Scarlatella,T Schalk, A Seiden,A J Weinstein,R Xu, Santa Cru,B I Eisenstein,T Freese, G Gla,J M Izen,I E Stockdale, B Tripsas,U Mallik, Tim Bolton,R E Cassell,L P Chen, D H Coward,P C Kim,J Labs,A Odian, D Pitman,R H Schindler,W H Toki

msra（1991）

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Abstract

A mass independent amplitude analysis of the 1{1? and 7r+r- systems (M < 2 GeV/c") produced in J/G radiative deca,y is pre- sented. For the first time, a large spin zero component in the 0( 1720) mass region is observed, with all data samples analyzed. A small amount of spin two component in this mass region for the li-1; data samples is not ruled out with the present statistics. This study re- veals, also for the first time, the production of the .fa(1400) in the 7r+7rr- channel, and refines previous measurements of the .fz( 1270) and .f&525).

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