  With t-channel rho, f2(1270) exchange and the pi pi -> rho rho -> pi pi box
diagram contribution, we reproduce the pi pi isotensor S-wave and D-wave
scattering phase shifts and inelasticities up to 2.2 GeV quite well in a
K-matrix formalism. The t-channel rho exchange provides repulsive negative
phase shifts while the t-channel f2(1270) gives an attractive force to increase
the phase shifts for pi pi scattering above 1 GeV, and the coupled-channel box
diagram causes the inelasticities. The implication to the isoscalar pi pi
S-wave interaction is discussed.
