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. 2008 Oct 31;101(18):182002.
doi: 10.1103/PhysRevLett.101.182002. Epub 2008 Oct 30.

Measurement of the eta'-meson mass using J/psi-->gammaeta'

J Libby  1 , L Martin, A Powell, G Wilkinson, K M Ecklund, W Love, V Savinov, H Mendez, J Y Ge, D H Miller, I P J Shipsey, B Xin, G S Adams, M Anderson, J P Cummings, I Danko, D Hu, B Moziak, J Napolitano, Q He, J Insler, H Muramatsu, C S Park, E H Thorndike, F Yang, M Artuso, S Blusk, S Khalil, J Li, R Mountain, S Nisar, K Randrianarivony, N Sultana, T Skwarnicki, S Stone, J C Wang, L M Zhang, G Bonvicini, D Cinabro, M Dubrovin, A Lincoln, P Naik, J Rademacker, D M Asner, K W Edwards, J Reed, R A Briere, T Ferguson, G Tatishvili, H Vogel, M E Watkins, J L Rosner, J P Alexander, D G Cassel, J E Duboscq, R Ehrlich, L Fields, R S Galik, L Gibbons, R Gray, S W Gray, D L Hartill, B K Heltsley, D Hertz, J M Hunt, J Kandaswamy, D L Kreinick, V E Kuznetsov, J Ledoux, H Mahlke-Krüger, D Mohapatra, P U E Onyisi, J R Patterson, D Peterson, D Riley, A Ryd, A J Sadoff, X Shi, S Stroiney, W M Sun, T Wilksen, S B Athar, R Patel, J Yelton, P Rubin, B I Eisenstein, I Karliner, S Mehrabyan, N Lowrey, M Selen, E J White, J Wiss, R E Mitchell, M R Shepherd, D Besson, T K Pedlar, D Cronin-Hennessy, K Y Gao, J Hietala, Y Kubota, T Klein, B W Lang, R Poling, A W Scott, P Zweber, S Dobbs, Z Metreveli, K K Seth, A Tomaradze; CLEO Collaboration
Affiliations

Measurement of the eta'-meson mass using J/psi-->gammaeta'

J Libby et al. Phys Rev Lett. .

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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