Abstract
A dispersive implementation of the a0(980) resonance to (đ â 2)” requires the knowledge of the double-virtual S-wave Îł * Îł * â Ïη / KKÂŻI = 1 am plitudes. To obtain these amplitudes we used a modified coupled-channel Muskhelishvili-OmnĂšs formalism, with the input from the left-hand cuts and the hadronic OmnĂšs function. The latter were obtained using a data-driven N/D method in which the fits were performed to the different sets of experimental data on two-photon fusion processes with Ïη and KKÂŻ final states. This yields the preliminary dispersive estimate aÎŒHLbL[a0(980)]resc. = -0.46(2) Ă 10-11.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have