Axial Vector Tetraquark with Two s-quarks

Yoshiko Kanada-En'yo, Osamu Morimatsu, Tetsuo Nishikawa

Possibility of an axial vector isoscalar tetraquark $ud\bar{s}\bar{s}$ is discussed. If a $f_1$ meson in the mass region $1.4-1.5$ GeV consists of four quarks $ns\bar{n}\bar{s}$, t…