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. 2006 May 12;96(18):182002.
doi: 10.1103/PhysRevLett.96.182002. Epub 2006 May 10.

Observation of Psi(3770)-->gammachi(c1)-->gammagammaJ/Psi

T E Coan  1 , Y S Gao, F Liu, M Artuso, C Boulahouache, S Blusk, J Butt, O Dorjkhaidav, J Li, N Menaa, R Mountain, R Nandakumar, K Randrianarivony, R Redjimi, R Sia, T Skwarnicki, S Stone, J C Wang, K Zhang, S E Csorna, G Bonvicini, D Cinabro, M Dubrovin, A Lincoln, R A Briere, G P Chen, J Chen, T Ferguson, G Tatishvili, H Vogel, M E Watkins, J L Rosner, N E Adam, J P Alexander, K Berkelman, D G Cassel, V Crede, J E Duboscq, K M Ecklund, R Ehrlich, L Fields, R S Galik, L Gibbons, B Gittelman, R Gray, S W Gray, D L Hartill, B K Heltsley, D Hertz, C D Jones, J Kandaswamy, D L Kreinick, V E Kuznetsov, H Mahlke-Krüger, T O Meyer, P U E Onyisi, J R Patterson, D Peterson, E A Phillips, J Pivarski, D Riley, A Ryd, A J Sadoff, H Schwarthoff, X Shi, M R Shepherd, S Stroiney, W M Sun, D Urner, T Wilksen, K M Weaver, M Weinberger, S B Athar, P Avery, L Breva-Newell, R Patel, V Potlia, H Stoeck, J Yelton, P Rubin, C Cawlfield, B I Eisenstein, G D Gollin, I Karliner, D Kim, N Lowrey, P Naik, C Sedlack, M Selen, E J White, J Williams, J Wiss, D M Asner, K W Edwards, D Besson, T K Pedlar, D Cronin-Hennessy, K Y Gao, D T Gong, J Hietala, Y Kubota, T Klein, B W Lang, S Z Li, R Poling, A W Scott, A Smith, S Dobbs, Z Metreveli, K K Seth, A Tomaradze, P Zweber, J Ernst, H Severini, S A Dytman, W Love, S Mehrabyan, J A Mueller, V Savinov, Z Li, A Lopez, H Mendez, J Ramirez, G S Huang, D H Miller, V Pavlunin, B Sanghi, I P J Shipsey, G S Adams, M Anderson, J P Cummings, I Danko, J Napolitano, Q He, H Muramatsu, C S Park, E H Thorndike; CLEO Collaboration
Affiliations

Observation of Psi(3770)-->gammachi(c1)-->gammagammaJ/Psi

T E Coan et al. Phys Rev Lett. .

Abstract

From e(+)e(-) collision data acquired with the CLEO detector at the Cornell Electron Storage Ring, we observe the non-DD(_) decay Psi(3770))-->gammachi(c1) with a statistical significance of 6.6 standard deviations, using the two-photon cascades to J/Psi and J/Psi-->l(+)l(-). We determine sigma(e(=)e(-)-->Psi(3770))xBeta(Psi(3770)-->gammachi(c1))=(18.0 +/- 3.3 +/- 2.5) pb and branching fraction Beta(Psi(3770)-->gammachi(c1)=(2.8 +/- 0.5+/-0.4) x 10(-3). We set 90% C.L. upper limits for the transition to chi(c2) (chi(c0)): sigma x Beta<5.7 pb (<282 pb) and Beta<0.9 x 10(-3) (<44 x 10(-3)). We also determine Gamma(Psi(3770)gammachi(c1))/Gamma(Psi(3770)-->pi(+)pi(-)J/Psi)=1.5 +/- 0.3 +/- 0.3 (>1.0 at 90% C.L.), which bears upon the interpretation of X(3872).

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