The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
A partial wave analysis of BES J/ψ->γ(ηπ + π - ) data has been performed in the mass region 1.1 to 2.0 GeV. A peak is observed due to η(1440) in the ηπ + π - invariant mass distribution; J P =0 - is preferred over 1 + . Its mass is M=1385+/-7 MeV and it decays into both ησ and a 0 (980)π, with BR[a 0 (980)π, a 0 ->ηπ/ησ]=0...
BES data on J/ψ->γ(K + K - π 0 ) display a strong peak in the K + K - π 0 mass spectrum at 1450 MeV. This peak and a corresponding one in J/ψ->γ(ηπ + π - ) at ~1400 MeV may be fitted well by η(1440) with dominant decays to K * (890)K, using an s-dependent width in the Breit-Wigner amplitude. A broad background is also required...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.