Observation of eta'c production in gammagamma fusion at CLEO

D M Asner; S A Dytman; S Mehrabyan; J A Mueller; S Nam; V Savinov; G S Huang; D H Miller; V Pavlunin; B Sanghi; E I Shibata; I P J Shipsey; G S Adams; M Chasse; J P Cummings; I Danko; J Napolitano; D Cronin-Hennessy; C S Park; W Park; J B Thayer; E H Thorndike; T E Coan; Y S Gao; F Liu; R Stroynowski; M Artuso; C Boulahouache; S Blusk; J Butt; E Dambasuren; O Dorjkhaidav; J Haynes; N Menaa; R Mountain; H Muramatsu; R Nandakumar; R Redjimi; R Sia; T Skwarnicki; S Stone; J C Wang; Kevin Zhang; A H Mahmood; S E Csorna; G Bonvicini; D Cinabro; M Dubrovin; A Bornheim; E Lipeles; S P Pappas; A Shapiro; A J Weinstein; R Mahapatra; H N Nelson; R A Briere; G P Chen; T Ferguson; G Tatishvili; H Vogel; M E Watkins; N E Adam; J P Alexander; K Berkelman; V Boisvert; D G Cassel; J E Duboscq; K M Ecklund; R Ehrlich; R S Galik; L Gibbons; B Gittelman; S W Gray; D L Hartill; B K Heltsley; L Hsu; C D Jones; J Kandaswamy; D L Kreinick; V E Kuznetsov; A Magerkurth; H Mahlke-Krüger; T O Meyer; J R Patterson; T K Pedlar; D Peterson; J Pivarski; D Riley; A J Sadoff; H Schwarthoff; M R Shepherd; W M Sun; J G Thayer; D Urner; T Wilksen; M Weinberger; S B Athar; P Avery; L Breva-Newell; V Potlia; H Stoeck; J Yelton; B I Eisenstein; G D Gollin; I Karliner; N Lowrey; P Naik; C Sedlack; M Selen; J J Thaler; J Williams; K W Edwards; D Besson; K Y Gao; D T Gong; Y Kubota; S Z Li; R Poling; A W Scott; A Smith; C J Stepaniak; J Urheim; Z Metreveli; K K Seth; A Tomaradze; P Zweber; K Arms; E Eckhart; K K Gan; C Gwon; H Severini; P Skubic; CLEO Collaboration

doi:10.1103/PhysRevLett.92.142001

Observation of eta'c production in gammagamma fusion at CLEO

Phys Rev Lett. 2004 Apr 9;92(14):142001. doi: 10.1103/PhysRevLett.92.142001. Epub 2004 Apr 5.

Authors

D M Asner¹, S A Dytman, S Mehrabyan, J A Mueller, S Nam, V Savinov, G S Huang, D H Miller, V Pavlunin, B Sanghi, E I Shibata, I P J Shipsey, G S Adams, M Chasse, J P Cummings, I Danko, J Napolitano, D Cronin-Hennessy, C S Park, W Park, J B Thayer, E H Thorndike, T E Coan, Y S Gao, F Liu, R Stroynowski, M Artuso, C Boulahouache, S Blusk, J Butt, E Dambasuren, O Dorjkhaidav, J Haynes, N Menaa, R Mountain, H Muramatsu, R Nandakumar, R Redjimi, R Sia, T Skwarnicki, S Stone, J C Wang, Kevin Zhang, A H Mahmood, S E Csorna, G Bonvicini, D Cinabro, M Dubrovin, A Bornheim, E Lipeles, S P Pappas, A Shapiro, A J Weinstein, R Mahapatra, H N Nelson, R A Briere, G P Chen, T Ferguson, G Tatishvili, H Vogel, M E Watkins, N E Adam, J P Alexander, K Berkelman, V Boisvert, D G Cassel, J E Duboscq, K M Ecklund, R Ehrlich, R S Galik, L Gibbons, B Gittelman, S W Gray, D L Hartill, B K Heltsley, L Hsu, C D Jones, J Kandaswamy, D L Kreinick, V E Kuznetsov, A Magerkurth, H Mahlke-Krüger, T O Meyer, J R Patterson, T K Pedlar, D Peterson, J Pivarski, D Riley, A J Sadoff, H Schwarthoff, M R Shepherd, W M Sun, J G Thayer, D Urner, T Wilksen, M Weinberger, S B Athar, P Avery, L Breva-Newell, V Potlia, H Stoeck, J Yelton, B I Eisenstein, G D Gollin, I Karliner, N Lowrey, P Naik, C Sedlack, M Selen, J J Thaler, J Williams, K W Edwards, D Besson, K Y Gao, D T Gong, Y Kubota, S Z Li, R Poling, A W Scott, A Smith, C J Stepaniak, J Urheim, Z Metreveli, K K Seth, A Tomaradze, P Zweber, K Arms, E Eckhart, K K Gan, C Gwon, H Severini, P Skubic; CLEO Collaboration

Affiliation

¹ University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.

PMID: 15089529
DOI: 10.1103/PhysRevLett.92.142001

Abstract

We report on the observation of the eta(')(c)(2(1)S0), the radial excitation of the eta(c)(1(1)S0) ground state of charmonium, in the two-photon fusion reaction gammagamma-->eta(')(c)-->K(0)(S)K+/-pi(-/+) in 13.6 fb(-1) of CLEO II/II.V data and 13.1 fb(-1) of CLEO III data. We obtain M(eta(')(c))=3642.9+/-3.1(stat)+/-1.5(syst) MeV and M(eta(c))=2981.8+/-1.3(stat)+/-1.5(syst) MeV. The corresponding values of hyperfine splittings between 1S0 and 3S1 states are DeltaM(hf)(1S)=115.1+/-2.0 MeV and DeltaM(hf)(2S)=43.1+/-3.4 MeV. Assuming that the eta(c) and eta(')(c) have equal branching fractions to K(S)Kpi, we obtain Gamma(gammagamma)(eta(')(c))=1.3+/-0.6 keV.