A global fit to determine the pseudoscalar mixing angle and the gluonium content of the eta ' meson
- 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.
DOIAbstract
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...
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