Photoproduction of $f_0(980)$ and $f_0(1500)$ resonances off a proton target

Abstract

We study the $\gamma p\to p{f}_0$ [$f_0(980)$ and $f_0(1500)$] reaction close to threshold within an effective Lagrangian approach. The production process is described by $s$-channel nucleon pole or $t$-channel $\rho$ and $\omega$ exchange. The $K^0{\bar{K}}^0$ invariant mass distributions of the $\gamma p\to f_0(980)p\to K^0{\bar{K}}^0$ and $\gamma p\to f_0(1500)p\to K^0{\bar{K}}^{0}p$ reactions are investigated, where the two kaons have been separated in $S$ wave decaying from $f_0(980)$ and $f_0(1500)$. It is shown that the $s$-channel process is favored for the production of $f_0(980)$, while for the $f_0(1500)$ production, the experimental measurements can be described quite well by the $t$-channel process. It is expected that the theoretical results can be tested by further experiments at CLAS.

6 pages, 7 figures. typos fixed, more references and discussions added