We have observed formation of the f1 (1285) in the reaction e+e-→e+e-π+π-η(η→γγ). Its γγ* width is determined in several Q2 bins. The γγ coupling parameter for the f1 (1285) is found to be 2.4±0.5±0.5 keV. This value is compared to that for the X (1420), another J=1 state formed in γγ fusion reactions, which may belong to the same meson nonet.
Bibliographical noteFunding Information:
neersa ndt echnicianfosr theire ffortsin the construction and maintenanocef t hed etectorsT.h iswork was supporteidn part by the United StatesD epartment of Energyt, heN ationaSl cienceF oundationth, eJoint Japan-UnitedSt atesC ollaboratioinn High-Energy Physics,a nd the Foundationfo r FundamentaRle - searcho n Matteri n the Netherlands.
ASJC Scopus subject areas
- Nuclear and High Energy Physics