Observation of psi(3770) --> pi pi J/psi and measurement of Gamma ee[psi(2S)]

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; T E Coan; 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; R A Briere; G P Chen; J Chen; T Ferguson; G Tatishvili; H Vogel; M E Watkins; J L Rosner; CLEO Collaboration

doi:10.1103/PhysRevLett.96.082004

Observation of psi(3770) --> pi pi J/psi and measurement of Gamma ee[psi(2S)]

Phys Rev Lett. 2006 Mar 3;96(8):082004. doi: 10.1103/PhysRevLett.96.082004. Epub 2006 Mar 3.

Authors

N E Adam¹, 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, T E Coan, 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, R A Briere, G P Chen, J Chen, T Ferguson, G Tatishvili, H Vogel, M E Watkins, J L Rosner; CLEO Collaboration

Affiliation

¹ Cornell University, Ithaca, New York 14853, USA.

PMID: 16606173
DOI: 10.1103/PhysRevLett.96.082004

Abstract

We observe signals for the decays psi(3770) --> XJ/psi from data acquired with the CLEO detector operating at the CESR e+ e- collider with square root of s = 3773 MeV. We measure the following branching fractions Beta(psi(3770) --> XJ/psi and significances: (189 +/- 20 +/- 20) x 10(-5) (11.6sigma) for X = pi+ pi-, (80 +/- 25 +/- 16) x 10(-5) (3.4sigma) for X = pi0 pi0, and (87 +/- 33 +/- 22) x 10(-5) (3.5sigma) for X = eta, where the errors are statistical and systematic, respectively. The radiative return process e+ e- --> gamma psi(2S) populates the same event sample and is used to measure Gamma ee[psi(2S)] = (2.54 +/- 0.03 +/- 0.11) keV.