Please use this identifier to cite or link to this item: http://hdl.handle.net/2307/390
Title: A global fit to determine the pseudoscalar mixing angle and the gluonium content of the eta ' meson
Authors: Ambrosino, F.
Antonelli, A.
Antonelli, M.
Archilli, F.
Beltrame, P.
Bencivenni, G.
Bertolucci, S.
Bini, C.
Bloise, C.
Bocchetta, Simona
Bossi, F.
Branchini, Paolo
Capon, G.
Capussela, T.
Ceradini, Filippo
Ciambrone, P.
De Lucia, E.
De Santis, A.
De Simone, P.
De Zorzi, G.
Denig, A.
Di Domenico, A.
Di Donato, C.
Di Micco, Biagio
Dreucci, M.
Felici, G.
Fiore, S.
Franzini, P.
Gatti, C.
Gauzzi, P.
Giovannella, S.
Graziani, Enrico
Jacewicz, M.
Lanfranchi, G.
Lee-Franzini, J.
Martini, M.
Massarotti, P.
Meola, S.
Miscetti, S.
Moulson, M.
Mueller, S.
Murtas, F.
Napolitano, M.
Nguyen, Federico
Palutan, M.
Pasqualucci, E.
Passeri, Antonio
Patera, V.
Santangelo, P.
Sciascia, B.
Spadaro, T.
Testa, M.
Tortora, Ludovico
Valente, P.
Venanzoni, G.
Versaci, R.
Xu, G.
Keywords: e+e− collisions
KLOE experiment
Pseudoscalar mesons
Phenomenological models
Mixing
Issue Date: 31-Jul-2009
Publisher: Institute of Physics Publishing
Abstract: We update the values of the eta-eta' mixing angle and of the eta' gluonium content by fitting our measurement R-phi = BR(phi -> etagamma)/BR(phi -> eta gamma) together with several vector meson radiative decays to pseudoscalars (V -> P gamma), pseudoscalar mesons radiative decays to vectors (P -> V gamma) and the eta' -> gamma gamma,pi(0) -> gamma gamma widths. From the fit we extract a gluonium fraction of Z(G)(2) = 0.12 +/- 0.04, the pseudoscalar mixing angle psi(P) = (40.4 +/- 0.6) degrees and the phi - omega mixing angle psi(V)= (3.32 +/- 0.09)degrees. Z(G)(2) and psi(P) are fairly consistent with those previously published. We also evaluate the impact on the eta' gluonium content determination of future experimental improvements of the eta' branching ratios and decay width.
URI: http://hdl.handle.net/2307/390
ISSN: 1126-6708
DOI: 10.1088/1126-6708/2009/07/105
Appears in Collections:A - Articolo su rivista
X_Dipartimento di Fisica 'Edoardo Amaldi'

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