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Measurement of prominent eta-decay branching fractions |
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| Authors: | Lopez A Mehrabyan S Mendez H Ramirez J Ge J Y Miller D H Sanghi B Shipsey I P J Xin B Adams G S Anderson M Cummings J P Danko I Hu D Moziak B Napolitano J He Q Insler J Muramatsu H Park C S Thorndike E H Yang F Artuso M Blusk S Khalil S Li J Menaa N Mountain R Nisar S Randrianarivony K Sia R Skwarnicki T Stone S Wang J C Bonvicini G Cinabro D Dubrovin M Lincoln A Asner D M Edwards K W Naik P Briere R A Ferguson T Tatishvili G Vogel H Watkins M E Rosner J L Adam N E Alexander J P Cassel D G Duboscq J E Ehrlich R Fields L Galik R S Gibbons L Gray R Gray S W Hartill D L Heltsley B K Hertz D |
| Institution: | University of Puerto Rico, Mayaguez, Puerto Rico 00681. |
| Abstract: | The decay psi(2S) --> etaJ/psi is used to measure, for the first time, all prominent eta-meson branching fractions with the same experiment in the same dataset, thereby providing a consistent treatment of systematics across branching fractions. We present results for eta decays to gamma gamma, pi(+)pi(-)pi(0), 3pi(0), pi(+)pi(-)gamma and e(+)e(-)gamma, accounting for 99.9% of all eta decays. The precision of several of the branching fractions and their ratios is improved. Two channels, pi(+)pi(-)gamma and e(+)e(-)gamma, show results that differ at the level of three standard deviations from those previously determined. |
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