We have measured the ratio $R_{phi}=BR(phi o eta^{prime} gamma)/BR(phi o eta gamma)$ by looking for the radiative decays $phi o eta^{prime} gamma$ and $phi o eta gamma$ in the final states $pi^+pi^-$ 7 $gamma$'s and 7 $gamma$'s respectively, in a sample of $sim 1.3cdot 10^{9}$ $phi$ mesons produced at the Frascati $phi$-factory. We obtain $R_{phi}=(4.77pm0.09_{stat}pm0.19_{sys})cdot 10^{-3}$ from which we derive $BR(phi o eta^{prime} gamma)=(6.20pm0.11_{stat}pm0.25_{sys})cdot 10^{-5}$. In the hypothesis of no gluonium content we extract the pseudoscalar mixing angle in the quark-flavor basis $phi_P=(41.4pm0.3_{stat}pm0.7_{sys}pm0.6_{th})^{circ}$. Combining the value of $R_{phi}$ with other constraints, we estimate the gluonium fractional content of $eta^{prime}$ meson as $Z^2 = 0.14pm0.04$ and the mixing angle $phi_P = (39.7pm0.7)^{circ}$.

Measurement of the pseudoscalar mixing angle and eta-prime gluonium content with KLOE detector / Ambrosino, Fabio; Capussela, Tiziana; Chiefari, Giovanni; C., Di Donato; Massarotti, Paolo; S., Meola; Napolitano, Marco; Perfetto, Francesco; Saracino, Giulio; e. t. a., L.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 648:(2007), pp. 267-273. [10.1016/j.physletb.2007.03.032]

Measurement of the pseudoscalar mixing angle and eta-prime gluonium content with KLOE detector

AMBROSINO, FABIO;CAPUSSELA, TIZIANA;CHIEFARI, GIOVANNI;MASSAROTTI, PAOLO;NAPOLITANO, MARCO;PERFETTO, FRANCESCO;SARACINO, GIULIO;
2007

Abstract

We have measured the ratio $R_{phi}=BR(phi o eta^{prime} gamma)/BR(phi o eta gamma)$ by looking for the radiative decays $phi o eta^{prime} gamma$ and $phi o eta gamma$ in the final states $pi^+pi^-$ 7 $gamma$'s and 7 $gamma$'s respectively, in a sample of $sim 1.3cdot 10^{9}$ $phi$ mesons produced at the Frascati $phi$-factory. We obtain $R_{phi}=(4.77pm0.09_{stat}pm0.19_{sys})cdot 10^{-3}$ from which we derive $BR(phi o eta^{prime} gamma)=(6.20pm0.11_{stat}pm0.25_{sys})cdot 10^{-5}$. In the hypothesis of no gluonium content we extract the pseudoscalar mixing angle in the quark-flavor basis $phi_P=(41.4pm0.3_{stat}pm0.7_{sys}pm0.6_{th})^{circ}$. Combining the value of $R_{phi}$ with other constraints, we estimate the gluonium fractional content of $eta^{prime}$ meson as $Z^2 = 0.14pm0.04$ and the mixing angle $phi_P = (39.7pm0.7)^{circ}$.
2007
Measurement of the pseudoscalar mixing angle and eta-prime gluonium content with KLOE detector / Ambrosino, Fabio; Capussela, Tiziana; Chiefari, Giovanni; C., Di Donato; Massarotti, Paolo; S., Meola; Napolitano, Marco; Perfetto, Francesco; Saracino, Giulio; e. t. a., L.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 648:(2007), pp. 267-273. [10.1016/j.physletb.2007.03.032]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/100992
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