Measurement of the hybrid content of heavy quarkonia using lattice nonrelativistic QCD - art. no. 074505

Using lowest-order lattice nonrelativistic QCD to create heavy meson propag ators and applying the spin-dependent interaction, c(B)(-g/2m(q))<(<sigma>) over right arrow>.(B) over right arrow, at varying intermediate time slices , we compute the off-diagonal matrix element of the Hamiltonian for the qua rkonium-hybrid two-state system. Thus far, we have results for one set of q uenched lattices with an interpolation in quark mass to match the bottomoni um spectrum. After diagonalization of the two-state Hamiltonian, we find th e ground state of the Y to show a 0.0035(1)c(B)(2) (with c(B)(2)similar to1 .5-3.1) probability admixture of hybrid, \ b(b) over bar g>.