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Measurement of the eta'-meson mass using J/psi-->gammaeta' |
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| Authors: | Libby J Martin L Powell A Wilkinson G Ecklund K M Love W Savinov V Mendez H Ge J Y Miller D H 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 Mountain R Nisar S Randrianarivony K Sultana N Skwarnicki T Stone S Wang J C Zhang L M Bonvicini G Cinabro D Dubrovin M Lincoln A Naik P Rademacker J Asner D M Edwards K W Reed J Briere R A Ferguson T Tatishvili G Vogel H Watkins M E Rosner J L Alexander J P Cassel D G Duboscq J E Ehrlich R Fields L Galik R S Gibbons L Gray R |
| Institution: | University of Oxford, Oxford OX1 3RH, United Kingdom. |
| Abstract: | We measure the mass of the eta;{'} meson using psi(2S)-->pi;{+}pi;{-}J/psi, J/psi-->gammaeta;{'} events acquired with the CLEO-c detector operating at the CESR e;{+}e;{-} collider. Using three decay modes, eta;{'}-->rho;{0}gamma, eta;{'}-->pi;{+}pi;{-}eta with eta-->gammagamma, and eta;{'}-->pi;{+}pi;{-}eta with eta-->pi;{+}pi;{-}pi;{0}, we find M_{eta;{'}}=957.793+/-0.054+/-0.036 MeV, in which the uncertainties are statistical and systematic, respectively. This result is consistent with but substantially more precise than the current world average. |
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