A study of the pi(0)pi(0) system produced in charge exchange and central collisions

A study of the pi(0)pi(0) system produced in charge exchange pi-p collision s at 38 and 100 GeV/c and in central pp interactions at 450 GeV/c has been carried out. The S wave has rather a complicated structure in both processe s indicating the existence of several scalar resonances. The f(0)(980) and f(0)(1500) appear as dips at 1 and 1.5 GeV in the S wave for charge exchang e reaction, and as shoulders at these masses in the S wave for central prod uction. The production of the f(0)(980), f(0)(1300) and f(0)(1500) in the r eaction pp --> p(f)pi(0)pi(0)p(s) as a function of the dP(T) kinematical fi lter shows the behaviour differed from what has been observed for the undis puted q (q) over bar mesons. An extra f(0)(2000) state is seen in the S wav e for charge exchange reaction as a dip at 2 GeV. Resonances with higher sp ins, f(2)(1270), f(4)(2050) and f(6)(2510), have also been studied. All the three mesons are produced in the reaction pi(-) p --> pi(0)pi(0)n mainly v ia an one-pion exchange for small -t, whereas a natural-parity exchange dom imates for large -t. The behaviour of the centrally produced f(2)(1270) as a function of the dP(T) is consistent with what has been observed for other q (q) over bar states.