Cao F-G2023-12-112024-07-252021-09-072023-12-112024-07-252021-09-22Cao FG. (2021). Radial excitation of light mesons and the transition form factor. Physical Review D. 104. 5.2470-0010https://mro.massey.ac.nz/handle/10179/70427We investigate radial excitation of the quark-antiquark pair in the π0 meson and its effects on the γγ* → π0 transition form factor in the framework of light cone perturbative QCD. The existing constraints on the light cone wave function of the lowest Fock state Iqq¯〉 in the π0 meson allow a sizeable radial excitation of the quark-antiquark pair. We construct the light cone wave function for the quark-antiquark pair in the first radially excited state (the 2S state) using a simple harmonic oscillator potential. The distribution amplitude obtained for the 2S state has two nodes in x at low scale of Q and thereby has a much strong scale dependence than the 1S state. Contributions from this radial excitation to the γγ* → π0 transition form factor exhibit different Q2-dependence behavior from the ground state and thus can modify the prediction for the transition form factor in the medium-large region of Q2.CC BY 4.0https://creativecommons.org/licenses/by/4.0/Journal article10.1103/PhysRevD.104.0540252470-0029journal-articlehttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000704621000002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=c5bb3b2499afac691c2e3c1a83ef6fefARTN 054025