Measurement of the pseudoscalar mixing angle and $η^{\prime}$ gluonium content with KLOE detector
| dc.creator | The KLOE Collaboration | |
| dc.creator | Ambrosino, F. | |
| dc.date | 2006-12-13 | |
| dc.date | 2007-07-18 | |
| dc.date.accessioned | 2026-07-07T11:58:20Z | |
| dc.date.available | 2026-07-07T11:58:20Z | |
| dc.description | We have measured the ratio $R_ϕ=BR(ϕ\to η^{\prime} γ)/BR(ϕ\to ηγ)$ by looking for the radiative decays $ϕ\to η^{\prime} γ$ and $ϕ\to ηγ$ in the final states $π^+π^-$ 7 $γ$'s and 7 $γ$'s respectively, in a sample of $\sim 1.3\cdot 10^{9}$ $ϕ$ mesons produced at the Frascati $ϕ$-factory. We obtain $R_ϕ=(4.77\pm0.09_{stat}\pm0.19_{sys})\cdot 10^{-3}$ from which we derive $BR(ϕ\to η^{\prime} γ)=(6.20\pm0.11_{stat}\pm0.25_{sys})\cdot 10^{-5}$. In the hypothesis of no gluonium content we extract the pseudoscalar mixing angle in the quark-flavor basis $ϕ_P=(41.4\pm0.3_{stat}\pm0.7_{sys}\pm0.6_{th})^{\circ}$. Combining the value of $R_ϕ$ with other constraints, we estimate the gluonium fractional content of $η^{\prime}$ meson as $Z^2 = 0.14\pm0.04$ and the mixing angle $ϕ_P = (39.7\pm0.7)^{\circ}$. | |
| dc.description | 13 pages, 8 figures | |
| dc.identifier | https://arxiv.org/abs/hep-ex/0612029 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/0612029 | |
| dc.identifier | Phys.Lett.B648:267-273,2007 | |
| dc.identifier | doi:10.1016/j.physletb.2007.03.032 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/206189 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Measurement of the pseudoscalar mixing angle and $η^{\prime}$ gluonium content with KLOE detector | |
| dc.type | text |