Based on a sample of (1310.6±10.5)×10 6 J/ψ events collected with the BESIII detector operating at the BEPCII storage ring, a partial wave analysis of the decay J/ψ → γφφ is performed in order to study the intermediate states.
+56−33 MeV/c 2 , are observed. In addition to these three pseudoscalar states, the scalar state f0(2100), and three tensor states, the f2(2010), f2(2300) and f2(2340), are observed in the process J/ψ → γφφ. The product branching fractions B(J/ψ → γX) × B(X → φφ) are reported.
An improved indirect scheme for laser positron generation is proposed. The positron yields in high-Z metal targets irradiated by laser produced electrons from near-critical density plasmas and underdense plasma are investigated numerically. It is found that the positron yield is mainly affected by the number of electrons of energies up to several hundreds of MeV. Using near-critical density targets for electron acceleration, the number of high energy electrons can be increased dramatically. Through start-to-end simulations, it is shown that up to positrons can be generated with state-of-the-art Joule-class femtosecond laser systems.
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