p̅p annihilation at rest into K_LK^±π^∓

We present a measurement and partial wave analysis of the final state K(L)K(+/-)pi(-/+) of (p) over bar p annihilation at rest in liquid hydrogen. This reaction is important for the study of the KK decay mode of scalar resonances, in particular, the isovectors a(0)(980) and a(0)(1450). The determination of the a(0)(1450) production also fixes the (K) over bar K coupling of the isoscalar f(0)(1500) which is discussed as a glueball. We find B((p) over bar p -->a(0)(1450)pi;a(0)(1450)-->(K) over bar K)=(8.88+/-1.68) X 10(-4) and hence B((p) over bar p-->f(0)(1500)pi;f(0)(1500)-->(K) over bar K)=(4.52 +/- 0.36) x 10(-4). The mass and width of a(0)(1450) are m = 1480+/-30 MeV/c(2) and Gamma = 265+/-15 MeV/c(2), respectively. For a(0)(980) we determine the relative ratio B((p) over bar p-->a(0) pi;a(0)-->(K) over bar K)/B((p) over bar p-->a(0) pi;a(0)-->pi eta)=0.23+/-0.05 and its relative coupling, (K) over bar K to pi eta, is 1.03+/-0.14. [S0556-2821(98)02907-5].