Instanton contribution to orbitally excited states of bottomonium mass spectra*

Our model uses the NRQM formalism for the study of properties of bottomonium states using a Hamiltonian which has the heavy quark potential derived from the instanton vacuum depending on r, the inter quark distance. The heavy quark potential derived from the instanton ensemble rises linearly as the relative distance between the quark and antiquark increases and gets saturated. The bound state of a bottom quark b and its antiquark b-bar known as bottomonium, plays an important role in the study of the strong interactions. A constituent quark model Hamiltonian should have both OGEP and instanton potential. The results showed that the instanton-induced potentials contribute significantly to the mass spectrum of heavy quark mesons